"Computationally Efficient UE Blocking Probability Model for GBR Services in Beyond 5G RAN", Oscar Adamuz-Hinojosa, Pablo Ameigeiras, Pablo Munoz, Juan M. Lopez-Soler, IEEE Access, pp. 1-1, 2024. DOI: 10.1109/ACCESS.2024.3377112

@ARTICLE{10471531,
  author={Adamuz-Hinojosa, Oscar and Ameigeiras, Pablo and Munoz, Pablo and Lopez-Soler, Juan M.},
  journal={IEEE Access},
  title={Computationally Efficient UE Blocking Probability Model for GBR Services in Beyond 5G RAN},
  year={2024},
  volume={},
  number={},
  pages={1-1},
  keywords={Signal to noise ratio;Computational modeling;Interference;Data models;Probability;Planning;Mathematical models;Beyond 5G;Blocking probability;GBR service;Markov Chain;Proportional Fair;Round Robin},
  doi={10.1109/ACCESS.2024.3377112},
  impact = {(IF=3.9, Q2)},
  project = {6gchronos|6ginspire}}

"Potential-Game-Based 5G RAN Slice Planning for GBR Services", Oscar Adamuz-Hinojosa, Pablo Munoz, Pablo Ameigeiras, Juan M. Lopez-Soler, IEEE Access, pp. 1-1, 2023. DOI: 10.1109/ACCESS.2023.3236103

@ARTICLE{10015017,
  author={Adamuz-Hinojosa, Oscar and Munoz, Pablo and Ameigeiras, Pablo and Lopez-Soler, Juan M.},
  journal={IEEE Access},
  title={Potential-Game-Based 5G RAN Slice Planning for GBR Services},
  year={2023},
  volume={},
  number={},
  pages={1-1},
  doi={10.1109/ACCESS.2023.3236103},
  impact = {(IF=3.9, Q2)},
  project = {6gchronos|true5g|5gclarity}}

"A Stochastic Network Calculus (SNC)-Based Model for Planning B5G uRLLC RAN Slices", Oscar Adamuz-Hinojosa, Vincenzo Sciancalepore, Pablo Ameigeiras, Juan M. Lopez-Soler, Xavier Costa-Perez, IEEE Transactions on Wireless Communications, 22 (2), pp. 1250-1265, 2023. DOI: 10.1109/TWC.2022.3203937

@ARTICLE{9887634,
  author={Adamuz-Hinojosa, Oscar and Sciancalepore, Vincenzo and Ameigeiras, Pablo and Lopez-Soler, Juan M. and Costa-Perez, Xavier},
  journal={IEEE Transactions on Wireless Communications},
  title={A Stochastic Network Calculus (SNC)-Based Model for Planning B5G uRLLC RAN Slices},
  year={2023},
  volume={22},
  number={2},
  pages={1250-1265},
  doi={10.1109/TWC.2022.3203937},
  impact = {IF=10.4 (Q1)},
  project = {true5g|5gclarity}}

"UE Blocking Probability Model for Planning 5G Guaranteed Bit Rate (GBR) RAN Slices", Oscar Adamuz-Hinojosa, Pablo Ameigeiras, Pablo Munoz, Juan M. Lopez-Soler, IEEE Transactions on Vehicular Technology, 2023. DOI: 10.1109/TVT.2023.3266526

@ARTICLE{2023Adamuz,
  author={Adamuz-Hinojosa, Oscar and Ameigeiras, Pablo and Munoz, Pablo and Lopez-Soler, Juan M.},
  journal={IEEE Transactions on Vehicular Technology},
  title={UE Blocking Probability Model for Planning 5G Guaranteed Bit Rate (GBR) RAN Slices},
  year={2023},
  doi={10.1109/TVT.2023.3266526},
  impact = {IF=6.8 (Q1)},
  project = {true5g|5gclarity|6gchronos}}

"5G Infrastructure Network Slicing: E2E Mean Delay Model and Effectiveness Assessment to Reduce Downtimes in Industry 4.0", Lorena Chinchilla-Romero, Jonathan Prados-Garzon, Pablo Ameigeiras, Pablo Munoz, Juan M. Lopez-Soler, Sensors, 22 (1), 2022. DOI: 10.3390/s22010229

Fifth Generation (5G) is expected to meet stringent performance network requisites of the Industry 4.0. Moreover, its built-in network slicing capabilities allow for the support of the traffic heterogeneity in Industry 4.0 over the same physical network infrastructure. However, 5G network slicing capabilities might not be enough in terms of degree of isolation for many private 5G networks use cases, such as multi-tenancy in Industry 4.0. In this vein, infrastructure network slicing, which refers to the use of dedicated and well isolated resources for each network slice at every network domain, fits the necessities of those use cases. In this article, we evaluate the effectiveness of infrastructure slicing to provide isolation among production lines (PLs) in an industrial private 5G network. To that end, we develop a queuing theory-based model to estimate the end-to-end (E2E) mean packet delay of the infrastructure slices. Then, we use this model to compare the E2E mean delay for two configurations, i.e., dedicated infrastructure slices with segregated resources for each PL against the use of a single shared infrastructure slice to serve the performance-sensitive traffic from PLs. Also we evaluate the use of Time-Sensitive Networking (TSN) against bare Ethernet to provide layer 2 connectivity among the 5G system components. We use a complete and realistic setup based on experimental and simulation data of the scenario considered. Our results support the effectiveness of infrastructure slicing to provide isolation in performance among the different slices. Then, using dedicated slices with segregated resources for each PL might reduce the number of the production downtimes and associated costs as the malfunctioning of a PL will not affect the network performance perceived by the performance-sensitive traffic from other PLs. Last, our results show that, besides the improvement in performance, TSN technology truly provides full isolation in the transport network compared to standard Ethernet thanks to traffic prioritization, traffic regulation, and bandwidth reservation capabilities.

@Article{s22010229,
AUTHOR = {Chinchilla-Romero, Lorena and Prados-Garzon, Jonathan and Ameigeiras, Pablo and Munoz, Pablo and Lopez-Soler, Juan M.},
TITLE = {5G Infrastructure Network Slicing: E2E Mean Delay Model and Effectiveness Assessment to Reduce Downtimes in Industry 4.0},
JOURNAL = {Sensors},
VOLUME = {22},
YEAR = {2022},
NUMBER = {1},
ARTICLE-NUMBER = {229},
URL = {https://www.mdpi.com/1424-8220/22/1/229},
PubMedID = {35009771},
ISSN = {1424-8220},
ABSTRACT = {Fifth Generation (5G) is expected to meet stringent performance network requisites of the Industry 4.0. Moreover, its built-in network slicing capabilities allow for the support of the traffic heterogeneity in Industry 4.0 over the same physical network infrastructure. However, 5G network slicing capabilities might not be enough in terms of degree of isolation for many private 5G networks use cases, such as multi-tenancy in Industry 4.0. In this vein, infrastructure network slicing, which refers to the use of dedicated and well isolated resources for each network slice at every network domain, fits the necessities of those use cases. In this article, we evaluate the effectiveness of infrastructure slicing to provide isolation among production lines (PLs) in an industrial private 5G network. To that end, we develop a queuing theory-based model to estimate the end-to-end (E2E) mean packet delay of the infrastructure slices. Then, we use this model to compare the E2E mean delay for two configurations, i.e., dedicated infrastructure slices with segregated resources for each PL against the use of a single shared infrastructure slice to serve the performance-sensitive traffic from PLs. Also we evaluate the use of Time-Sensitive Networking (TSN) against bare Ethernet to provide layer 2 connectivity among the 5G system components. We use a complete and realistic setup based on experimental and simulation data of the scenario considered. Our results support the effectiveness of infrastructure slicing to provide isolation in performance among the different slices. Then, using dedicated slices with segregated resources for each PL might reduce the number of the production downtimes and associated costs as the malfunctioning of a PL will not affect the network performance perceived by the performance-sensitive traffic from other PLs. Last, our results show that, besides the improvement in performance, TSN technology truly provides full isolation in the transport network compared to standard Ethernet thanks to traffic prioritization, traffic regulation, and bandwidth reservation capabilities.},
DOI = {10.3390/s22010229},
project={5gclarity|true5g},
impact = {(IF=3.9, Q2)},
}

"A Complete LTE Mathematical Framework for the Network Slice Planning of the EPC", J. Prados-Garzon, A. Laghrissi, M. Bagaa, T. Taleb, J. M. Lopez-Soler, IEEE Transactions on Mobile Computing, 19 (1), pp. 1-14, 2020. DOI: 10.1109/TMC.2018.2890235

5G is the next telecommunications standards that will enable the sharing of physical infrastructures to provision ultra shortlatency applications, mobile broadband services, Internet of Things, etc. Network slicing is the virtualization technique that is expected to achieve that, as it can allow logical networks to run on top of a common physical infrastructure and ensure service level agreement requirements for different services and applications. In this vein, our paper proposes a novel and complete solution for planning network slices of the LTE EPC, tailored for the enhanced Mobile BroadBand use case. The solution defines a framework which consists of: i) an abstraction of the LTE workload generation process, ii) a compound traffic model, iii) performance models of the whole LTE network, and iv) an algorithm to jointly perform the resource dimensioning and network embedding. Our results show that the aggregated signaling generation is a Poisson process and the data traffic exhibits self-similarity and long-range-dependence features. The proposed performance models for the LTE network rely on these results. We formulate the joint optimization problem of resources dimensioning and embedding of a virtualized EPC and propose a heuristic to solve it. By using simulation tools, we validate the proper operation of our solution.

@ARTICLE{8603789,  author={J. {Prados-Garzon} and A. {Laghrissi} and M. {Bagaa} and T. {Taleb} and J. M. {Lopez-Soler}},  journal={IEEE Transactions on Mobile Computing},   title={A Complete LTE Mathematical Framework for the Network Slice Planning of the EPC},   year={2020},  volume={19},  number={1},  pages={1-14},  abstract={5G is the next telecommunications standards that will enable the sharing of physical infrastructures to provision ultra shortlatency applications, mobile broadband services, Internet of Things, etc. Network slicing is the virtualization technique that is expected to achieve that, as it can allow logical networks to run on top of a common physical infrastructure and ensure service level agreement requirements for different services and applications. In this vein, our paper proposes a novel and complete solution for planning network slices of the LTE EPC, tailored for the enhanced Mobile BroadBand use case. The solution defines a framework which consists of: i) an abstraction of the LTE workload generation process, ii) a compound traffic model, iii) performance models of the whole LTE network, and iv) an algorithm to jointly perform the resource dimensioning and network embedding. Our results show that the aggregated signaling generation is a Poisson process and the data traffic exhibits self-similarity and long-range-dependence features. The proposed performance models for the LTE network rely on these results. We formulate the joint optimization problem of resources dimensioning and embedding of a virtualized EPC and propose a heuristic to solve it. By using simulation tools, we validate the proper operation of our solution.},  keywords={Long Term Evolution;Planning;Quality of service;Analytical models;Logic gates;Optimization;5G mobile communication;LTE;EPC;network slicing;NFV;softwarized networks;mobile networks;traffic characterization;resources dimensioning;network embedding},  doi={10.1109/TMC.2018.2890235},  ISSN={1558-0660},  month={Jan}, impact={(IF=5.112, Q1)}, project={5gcity}}

"A Survey on 5G Usage Scenarios and Traffic Models", J. Navarro-Ortiz, P. Romero-Diaz, S. Sendra, P. Ameigeiras, J. J. Ramos-Munoz, J. M. Lopez-Soler, IEEE Communications Surveys Tutorials, 22 (2), pp. 905-929, 2020. DOI: 10.1109/COMST.2020.2971781

@Article{8985528,  author={J. {Navarro-Ortiz} and P. {Romero-Diaz} and S. {Sendra} and P. {Ameigeiras} and J. J. {Ramos-Munoz} and J. M. {Lopez-Soler}},  journal={{IEEE} Communications Surveys Tutorials}, title={A Survey on 5G Usage Scenarios and Traffic Models}, year={2020}, month=2, volume={22}, number={2}, pages={905-929}, doi={10.1109/COMST.2020.2971781}, project="artemis|5gclarity|5gcity", impact = {(IF=23.7, Q1)}, pdf={https://digibug.ugr.es/handle/10481/59687}}

"Harmonizing 3GPP and NFV Description Models: Providing Customized RAN Slices in 5G Networks", O. Adamuz-Hinojosa, P. Munoz, J. Ordonez-Lucena, J. J. Ramos-Munoz, J. M. Lopez-Soler, IEEE Vehicular Technology Magazine, 14 (4), pp. 64-75, 2019. DOI: 10.1109/MVT.2019.2936168

The standardization of radio access networks (RANs) in mobile networks has traditionally been led by the 3rd Generation Partnership Project (3GPP). However, the emergence of RAN slicing has introduced new aspects that fall outside the 3GPP scope. Among them, network virtualization enables the particularization of multiple behaviors over a common physical infrastructure. Using virtualized network functions (VNFs) that comprise customized radio functionalities, each virtualized RAN (i.e., RAN slice) could meet its specific requirements. Although the 3GPP specifies the description model to manage RAN slices, it can neither particularize the behavior of a RAN slice nor leverage the network function virtualization (NFV) descriptors to define how its VNFs can accommodate its spatial and temporal traffic demands. In this article, we propose a description model that harmonizes 3GPP and the European Telecommunication Standard Institute (ETSI)-NFV Group viewpoints to manage RAN slices. The proposed model enables the translation of RAN slice requirements into customized, virtualized radio functionalities defined through NFV descriptors. To clarify this proposal, we provide an example describing three RAN slices with disruptive requirements following our solution.

@ARTICLE{8854309,  author={O. {Adamuz-Hinojosa} and P. {Munoz} and J. {Ordonez-Lucena} and J. J. {Ramos-Munoz} and J. M. {Lopez-Soler}},  journal={IEEE Vehicular Technology Magazine},   title={Harmonizing 3GPP and NFV Description Models: Providing Customized RAN Slices in 5G Networks},   year={2019},  volume={14},  number={4},  pages={64-75},  abstract={The standardization of radio access networks (RANs) in mobile networks has traditionally been led by the 3rd Generation Partnership Project (3GPP). However, the emergence of RAN slicing has introduced new aspects that fall outside the 3GPP scope. Among them, network virtualization enables the particularization of multiple behaviors over a common physical infrastructure. Using virtualized network functions (VNFs) that comprise customized radio functionalities, each virtualized RAN (i.e., RAN slice) could meet its specific requirements. Although the 3GPP specifies the description model to manage RAN slices, it can neither particularize the behavior of a RAN slice nor leverage the network function virtualization (NFV) descriptors to define how its VNFs can accommodate its spatial and temporal traffic demands. In this article, we propose a description model that harmonizes 3GPP and the European Telecommunication Standard Institute (ETSI)-NFV Group viewpoints to manage RAN slices. The proposed model enables the translation of RAN slice requirements into customized, virtualized radio functionalities defined through NFV descriptors. To clarify this proposal, we provide an example describing three RAN slices with disruptive requirements following our solution.},  keywords={3GPP;Biological system modeling;5G mobile communication;Virtualization;Vehicular and wireless technologies;Radio access networks},  doi={10.1109/MVT.2019.2936168},  ISSN={1556-6080},  month={Dec},impact={(IF=7.921, Q1)}, project={5gcity}, pdf={https://digibug.ugr.es/handle/10481/68200}}

"Performance Modeling of Softwarized Network Services Based on Queuing Theory With Experimental Validation", J. Prados-Garzon, P. Ameigeiras, J. J. Ramos-Munoz, J. Navarro-Ortiz, P. Andres-Maldonado, J. M. Lopez-Soler, IEEE Transactions on Mobile Computing, 20 (4), pp. 1558-1573, 2019. DOI: 10.1109/TMC.2019.2962488

@Article{8943161,  author={J. {Prados-Garzon} and P. {Ameigeiras} and J. J. {Ramos-Munoz} and J. {Navarro-Ortiz} and P. {Andres-Maldonado} and J. M. {Lopez-Soler}},  journal={{IEEE} Transactions on Mobile Computing},   title={Performance Modeling of Softwarized Network Services Based on Queuing Theory With Experimental Validation},   year={2019}, month={12},  volume={20},  number={4},  pages={1558-1573},  doi={10.1109/TMC.2019.2962488}, project="5gclarity|5gcity", impact={(IF=5.112, Q1)}, pdf={https://digibug.ugr.es/handle/10481/59700}}

"Analytical Modeling and Experimental Validation of NB-IoT Device Energy Consumption", P. Andres-Maldonado, M. Lauridsen, P. Ameigeiras, J. M. Lopez-Soler, IEEE Internet of Things Journal, 6 (3), pp. 5691-5701, 2019. DOI: 10.1109/JIOT.2019.2904802

The recent standardization of 3GPP Narrowband Internet of Things (NB-IoT) paves the way to support low-power wide-area (LPWA) use cases in cellular networks. NB-IoT design goals are extended coverage, low power and low cost devices, and massive connections. As a new radio access technology, it is necessary to analyze the possibilities NB-IoT provides to support different traffic and coverage needs. In this paper, we propose and validate an NB-IoT energy consumption model. The analytical model is based on a Markov chain. For the validation, an experimental setup is used to measure the energy consumption of two commercial NB-IoT user equipments (UEs) connected to a base station emulator. The evaluation is done considering three test cases. The comparison of the model and measurements is done in terms of the estimated battery lifetime and the latency needed to finish the control plane procedure. The conducted evaluation shows the analytical model performs well, obtaining a maximum relative error of the battery lifetime estimation between the model and the measurements of 21% for an assumed interarrival time (IAT) of 6 min.

@ARTICLE{8666720,  author={P. {Andres-Maldonado} and M. {Lauridsen} and P. {Ameigeiras} and J. M. {Lopez-Soler}},  journal={IEEE Internet of Things Journal},   title={Analytical Modeling and Experimental Validation of NB-IoT Device Energy Consumption},   year={2019},  volume={6},  number={3},  pages={5691-5701},  abstract={The recent standardization of 3GPP Narrowband Internet of Things (NB-IoT) paves the way to support low-power wide-area (LPWA) use cases in cellular networks. NB-IoT design goals are extended coverage, low power and low cost devices, and massive connections. As a new radio access technology, it is necessary to analyze the possibilities NB-IoT provides to support different traffic and coverage needs. In this paper, we propose and validate an NB-IoT energy consumption model. The analytical model is based on a Markov chain. For the validation, an experimental setup is used to measure the energy consumption of two commercial NB-IoT user equipments (UEs) connected to a base station emulator. The evaluation is done considering three test cases. The comparison of the model and measurements is done in terms of the estimated battery lifetime and the latency needed to finish the control plane procedure. The conducted evaluation shows the analytical model performs well, obtaining a maximum relative error of the battery lifetime estimation between the model and the measurements of 21% for an assumed interarrival time (IAT) of 6 min.},  keywords={Internet of Things;Energy consumption;Analytical models;Batteries;Narrowband;Downlink;Battery charge measurement;Analytical model;control plane (CP);energy consumption;latency;narrowband Internet of Things (NB-IoT)},  doi={10.1109/JIOT.2019.2904802},  ISSN={2327-4662},  month={June},impact={(IF=9.936, Q1)}, project={5gcity}}

"A LoRaWAN Testbed Design for Supporting Critical Situations: Prototype and Evaluation", Jorge Navarro-Ortiz, Juan J. Ramos-Munoz, Juan M. Lopez-Soler, Cristina Cervello-Pastor, Marisa Catalan, Wireless Communications and Mobile Computing, 2019, pp. 1-13, 2019. DOI: 10.1155/2019/1684906

The Internet of Things is one of the hottest topics in communications today, with current revenues of \&\#x24;151B, around 7 billion connected devices, and an unprecedented growth expected for next years. A massive number of sensors and actuators are expected to emerge, requiring new wireless technologies that can extend their battery life and can cover large areas. LoRaWAN is one of the most outstanding technologies which fulfill these demands, attracting the attention of both academia and industry. In this paper, the design of a LoRaWAN testbed to support critical situations, such as emergency scenarios or natural disasters, is proposed. This self-healing LoRaWAN network architecture will provide resilience when part of the equipment in the core network may become faulty. This resilience is achieved by virtualizing and properly orchestrating the different network entities. Different options have been designed and implemented as real prototypes. Based on our performance evaluation, we claim that the usage of microservice orchestration with several replicas of the LoRaWAN network entities and a load balancer produces an almost seamless recovery which makes it a proper solution to recover after a system crash caused by any catastrophic event.

@Article{Navarro-Ortiz2019,
author={Navarro-Ortiz, Jorge
and Ramos-Munoz, Juan J.
and Lopez-Soler, Juan M.
and Cervello-Pastor, Cristina
and Catalan, Marisa},
title={A {LoRaWAN} Testbed Design for Supporting Critical Situations: Prototype and Evaluation},
journal={Wireless Communications and Mobile Computing},
year={2019},
month={Feb},
day={21},
publisher={Hindawi},
volume={2019},
pages={1-13},
abstract={The Internet of Things is one of the hottest topics in communications today, with current revenues of {\&}{\#}x24;151B, around 7 billion connected devices, and an unprecedented growth expected for next years. A massive number of sensors and actuators are expected to emerge, requiring new wireless technologies that can extend their battery life and can cover large areas. {LoRaWAN} is one of the most outstanding technologies which fulfill these demands, attracting the attention of both academia and industry. In this paper, the design of a {LoRaWAN} testbed to support critical situations, such as emergency scenarios or natural disasters, is proposed. This self-healing {LoRaWAN} network architecture will provide resilience when part of the equipment in the core network may become faulty. This resilience is achieved by virtualizing and properly orchestrating the different network entities. Different options have been designed and implemented as real prototypes. Based on our performance evaluation, we claim that the usage of microservice orchestration with several replicas of the {LoRaWAN} network entities and a load balancer produces an almost seamless recovery which makes it a proper solution to recover after a system crash caused by any catastrophic event.},
issn={1530-8669},
doi={10.1155/2019/1684906},
pdf={https://digibug.ugr.es/handle/10481/59786},
impact={(IF=1.819, Q3)},
project={5gcity}
}

"An Analytical Performance Evaluation Framework for NB-IoT", P. Andres-Maldonado, P. Ameigeiras, J. Prados-Garzon, J. Navarro-Ortiz, J. M. Lopez-Soler, IEEE Internet of Things Journal, 6 (4), pp. 7232-7240, 2019. DOI: 10.1109/JIOT.2019.2915349

@Article{8708311,  author={P. {Andres-Maldonado} and P. {Ameigeiras} and J. {Prados-Garzon} and J. {Navarro-Ortiz} and J. M. {Lopez-Soler}},  journal={{IEEE} Internet of Things Journal},   title={An Analytical Performance Evaluation Framework for NB-IoT}, month=4, year={2019},  volume={6},  number={4},  pages={7232-7240},  doi={10.1109/JIOT.2019.2915349}, impact={(IF=9.936, Q1)}, project={5gcity}, pdf={https://digibug.ugr.es/handle/10481/68246}}

"Integration of LoRaWAN and 4G/5G for the Industrial Internet of Things", J. Navarro-Ortiz, S. Sendra, P. Ameigeiras, J. M. Lopez-Soler, IEEE Communications Magazine, 56 (2), pp. 60-67, 2018. DOI: 10.1109/MCOM.2018.1700625

@Article{8291115,  author={J. {Navarro-Ortiz} and S. {Sendra} and P. {Ameigeiras} and J. M. {Lopez-Soler}},  journal={{IEEE} Communications Magazine},   title={Integration of {LoRaWAN} and 4G/5G for the Industrial Internet of Things},   year={2018}, month=2, volume={56},  number={2},  pages={60-67},  doi={10.1109/MCOM.2018.1700625}, pdf={https://hdl.handle.net/10481/86867}, impact={(IF=9.27, Q1)}, project={5gcity}}

"Narrowband IoT Data Transmission Procedures for Massive Machine-Type Communications", P. Andres-Maldonado, P. Ameigeiras, J. Prados-Garzon, J. Navarro-Ortiz, J. M. Lopez-Soler, IEEE Network, 31 (6), pp. 8-15, 2017. DOI: 10.1109/MNET.2017.1700081

@Article{8120238,  author={P. {Andres-Maldonado} and P. {Ameigeiras} and J. {Prados-Garzon} and J. {Navarro-Ortiz} and J. M. {Lopez-Soler}},  journal={{IEEE} Network},   title={Narrowband IoT Data Transmission Procedures for Massive Machine-Type Communications},   year={2017},  month=11, volume={31},  number={6},  pages={8-15},  doi={10.1109/MNET.2017.1700081}, impact={(IF=7.197, Q1)}}

"Modeling and Dimensioning of a Virtualized MME for 5G Mobile Networks", J. Prados-Garzon, J. J. Ramos-Munoz, P. Ameigeiras, P. Andres-Maldonado, J. M. Lopez-Soler, IEEE Transactions on Vehicular Technology, 66 (5), pp. 4383-4395, 2017. DOI: 10.1109/TVT.2016.2608942

Network function virtualization is considered one of the key technologies for developing future mobile networks. In this paper, we propose a theoretical framework to evaluate the performance of a Long-Term Evolution (LTE) virtualized mobility management entity (vMME) hosted in a data center. This theoretical framework consists of 1) a queuing network to model the vMME in a data center and 2) analytic expressions to estimate the overall mean system delay and the signaling workload to be processed by the vMME. We validate our mathematical model by simulation. One direct use of the proposed model is vMME dimensioning, i.e., to compute the number of vMME processing instances to provide a target system delay given the number of users in the system. Additionally, the paper includes a scalability analysis of the system. In our study, we consider the billing model and a data center setup of Amazon Elastic Compute Cloud service and estimate the processing time of MME processing instances for different LTE control procedures experimentally. For the considered setup, our results show that the vMME is scalable for signaling workloads up to 37 000 LTE control procedures per second for a target mean system delay of 1 ms. The system design and database performance assumed imposes this limit in the system scalability.

@ARTICLE{7565650,  author={J. {Prados-Garzon} and J. J. {Ramos-Munoz} and P. {Ameigeiras} and P. {Andres-Maldonado} and J. M. {Lopez-Soler}},  journal={IEEE Transactions on Vehicular Technology},   title={Modeling and Dimensioning of a Virtualized MME for 5G Mobile Networks},   year={2017},  volume={66},  number={5},  pages={4383-4395},  abstract={Network function virtualization is considered one of the key technologies for developing future mobile networks. In this paper, we propose a theoretical framework to evaluate the performance of a Long-Term Evolution (LTE) virtualized mobility management entity (vMME) hosted in a data center. This theoretical framework consists of 1) a queuing network to model the vMME in a data center and 2) analytic expressions to estimate the overall mean system delay and the signaling workload to be processed by the vMME. We validate our mathematical model by simulation. One direct use of the proposed model is vMME dimensioning, i.e., to compute the number of vMME processing instances to provide a target system delay given the number of users in the system. Additionally, the paper includes a scalability analysis of the system. In our study, we consider the billing model and a data center setup of Amazon Elastic Compute Cloud service and estimate the processing time of MME processing instances for different LTE control procedures experimentally. For the considered setup, our results show that the vMME is scalable for signaling workloads up to 37 000 LTE control procedures per second for a target mean system delay of 1 ms. The system design and database performance assumed imposes this limit in the system scalability.},  keywords={Computational modeling;Delays;Scalability;Mathematical model;Mobile radio mobility management;Data models;Evolved packet core (EPC);fifth generation (5G);network functions virtualization (NFV);scalability;virtualization;virtualized mobility management entity (vMME)},  doi={10.1109/TVT.2016.2608942},  ISSN={1939-9359},  month={May},impact={(IF=4.432, Q1)}}

"Interference Bound for Local Channel Allocation", Jorge Navarro-Ortiz, Pablo Ameigeiras, Juan J. Ramos-Munoz, Jonathan Prados-Garzon, Juan M. Lopez-Soler, Wireless Personal Communications, 92 (4), pp. 1559-1574, 2017. DOI: 10.1007/s11277-016-3621-1

A lower bound of the total co-channel interference is proposed for the channel allocation problem when applied to a reduced set of nodes. The rest of the network nodes remain unaffected. This bound is independent of the particular channel allocation algorithm employed and no assumptions are made about the propagation model or the deployment scenario. Assuming that the bound is tight to the interference generated by the optimal channel allocation, its computation may help, for example, to estimate the minimum set of nodes for which channel allocation performs nearly-optimal while minimizing node reconfigurations. Another example of usage is the estimation of the minimum number of channels required for a given performance. The tightness of the proposed bound is evaluated through simulations, with a difference lower than 1\^A \% in the conducted simulations. In addition, a sample use case\^a\texteuro''adaptive local channel allocation\^a\texteuro''is also provided.

@Article{Navarro-Ortiz2017,
author={Navarro-Ortiz, Jorge
and Ameigeiras, Pablo
and Ramos-Munoz, Juan J.
and Prados-Garzon, Jonathan
and Lopez-Soler, Juan M.},
title={Interference Bound for Local Channel Allocation},
journal={Wireless Personal Communications},
year={2017},
month={Feb},
day={01},
volume={92},
number={4},
pages={1559-1574},
abstract={A lower bound of the total co-channel interference is proposed for the channel allocation problem when applied to a reduced set of nodes. The rest of the network nodes remain unaffected. This bound is independent of the particular channel allocation algorithm employed and no assumptions are made about the propagation model or the deployment scenario. Assuming that the bound is tight to the interference generated by the optimal channel allocation, its computation may help, for example, to estimate the minimum set of nodes for which channel allocation performs nearly-optimal while minimizing node reconfigurations. Another example of usage is the estimation of the minimum number of channels required for a given performance. The tightness of the proposed bound is evaluated through simulations, with a difference lower than 1{\^A} {\%} in the conducted simulations. In addition, a sample use case{\^a}{\texteuro}''adaptive local channel allocation{\^a}{\texteuro}''is also provided.},
issn={1572-834X},
doi={10.1007/s11277-016-3621-1},
impact={(IF=1.200, Q4)}
}

"3GPP QoS-based scheduling framework for LTE", Pablo Ameigeiras, Jorge Navarro-Ortiz, Pilar Andres-Maldonado, Juan M. Lopez-Soler, Javier Lorca, Quiliano Perez-Tarrero, Raquel Garcia-Perez, EURASIP Journal on Wireless Communications and Networking, 2016 (1), pp. 78, 2016. DOI: 10.1186/s13638-016-0565-9

This paper proposes the design of a scheduling framework for the downlink of the Long Term Evolution (LTE) system with the objective of meeting the Quality of Service (QoS) requirements as defined by the QoS architecture of the 3G Partnership Project (3GPP) specifications. We carry out a thorough review of 3GPP specifications analyzing the requirements of the 3GPP QoS architecture. LTE bearers may be associated with a Guaranteed Bit Rate (i.e., GBR bearers) or not (i.e., non-GBR bearers). Additionally, the specifications establish a Packet Delay Budget (PDB) to limit the maximum packet transfer delay. To achieve our goal, we design a channel-aware service discipline for GBR bearers which is able to fulfill not only the GBR but also the PDB. Additionally, we also design an algorithm for prioritizing GBR and non-GBR bearers from different QoS Class Identifiers (QCIs) following 3GPP QoS rules. We compare the proposed framework with two reference schedulers by means of network-level simulations. The results will show the ability of the proposed framework to address the QoS requirements from 3GPP specifications while providing an interesting performance from a spectral efficiency viewpoint.

@Article{Ameigeiras2016,
author={Ameigeiras, Pablo
and Navarro-Ortiz, Jorge
and Andres-Maldonado, Pilar
and Lopez-Soler, Juan M.
and Lorca, Javier
and Perez-Tarrero, Quiliano
and Garcia-Perez, Raquel},
title={3GPP QoS-based scheduling framework for LTE},
journal={EURASIP Journal on Wireless Communications and Networking},
year={2016},
month={Mar},
day={10},
volume={2016},
number={1},
pages={78},
abstract={This paper proposes the design of a scheduling framework for the downlink of the Long Term Evolution (LTE) system with the objective of meeting the Quality of Service (QoS) requirements as defined by the QoS architecture of the 3G Partnership Project (3GPP) specifications. We carry out a thorough review of 3GPP specifications analyzing the requirements of the 3GPP QoS architecture. LTE bearers may be associated with a Guaranteed Bit Rate (i.e., GBR bearers) or not (i.e., non-GBR bearers). Additionally, the specifications establish a Packet Delay Budget (PDB) to limit the maximum packet transfer delay. To achieve our goal, we design a channel-aware service discipline for GBR bearers which is able to fulfill not only the GBR but also the PDB. Additionally, we also design an algorithm for prioritizing GBR and non-GBR bearers from different QoS Class Identifiers (QCIs) following 3GPP QoS rules. We compare the proposed framework with two reference schedulers by means of network-level simulations. The results will show the ability of the proposed framework to address the QoS requirements from 3GPP specifications while providing an interesting performance from a spectral efficiency viewpoint.},
issn={1687-1499},
doi={10.1186/s13638-016-0565-9},
impact={(IF=1.529, Q3)}
}

"Virtualized MME Design for IoT Support in 5G Systems", Pilar Andres-Maldonado, Pablo Ameigeiras, Jonathan Prados-Garzon, Juan Jose Ramos-Munoz, Juan Manuel Lopez-Soler, Sensors, 16 (8), 2016. DOI: 10.3390/s16081338

Cellular systems are recently being considered an option to provide support to the Internet of Things (IoT). To enable this support, the 3rd Generation Partnership Project (3GPP) has introduced new procedures specifically targeted for cellular IoT. With one of these procedures, the transmissions of small and infrequent data packets from/to the devices are encapsulated in signaling messages and sent through the control plane. However, these transmissions from/to a massive number of devices may imply a major increase of the processing load on the control plane entities of the network and in particular on the Mobility Management Entity (MME). In this paper, we propose two designs of an MME based on Network Function Virtualization (NFV) that aim at facilitating the IoT support. The first proposed design partially separates the processing resources dedicated to each traffic class. The second design includes traffic shaping to control the traffic of each class. We consider three classes: Mobile Broadband (MBB), low latency Machine to Machine communications (lM2M) and delay-tolerant M2M communications. Our proposals enable reducing the processing resources and, therefore, the cost. Additionally, results show that the proposed designs lessen the impact between classes, so they ease the compliance of the delay requirements of MBB and lM2M communications.

@Article{s16081338,
AUTHOR = {Andres-Maldonado, Pilar and Ameigeiras, Pablo and Prados-Garzon, Jonathan and Ramos-Munoz, Juan Jose and Lopez-Soler, Juan Manuel},
TITLE = {Virtualized MME Design for IoT Support in 5G Systems},
JOURNAL = {Sensors},
VOLUME = {16},
YEAR = {2016},
NUMBER = {8},
ARTICLE-NUMBER = {1338},
URL = {https://www.mdpi.com/1424-8220/16/8/1338},
ISSN = {1424-8220},
ABSTRACT = {Cellular systems are recently being considered an option to provide support to the Internet of Things (IoT). To enable this support, the 3rd Generation Partnership Project (3GPP) has introduced new procedures specifically targeted for cellular IoT. With one of these procedures, the transmissions of small and infrequent data packets from/to the devices are encapsulated in signaling messages and sent through the control plane. However, these transmissions from/to a massive number of devices may imply a major increase of the processing load on the control plane entities of the network and in particular on the Mobility Management Entity (MME). In this paper, we propose two designs of an MME based on Network Function Virtualization (NFV) that aim at facilitating the IoT support. The first proposed design partially separates the processing resources dedicated to each traffic class. The second design includes traffic shaping to control the traffic of each class. We consider three classes: Mobile Broadband (MBB), low latency Machine to Machine communications (lM2M) and delay-tolerant M2M communications. Our proposals enable reducing the processing resources and, therefore, the cost. Additionally, results show that the proposed designs lessen the impact between classes, so they ease the compliance of the delay requirements of MBB and lM2M communications.},
DOI = {10.3390/s16081338},impact={(IF=2.677, Q1)}}

"Link-level access cloud architecture design based on SDN for 5G networks", P. Ameigeiras, J. J. Ramos-munoz, L. Schumacher, J. Prados-Garzon, J. Navarro-Ortiz, J. M. Lopez-soler, IEEE Network, 29 (2), pp. 24-31, 2015. DOI: 10.1109/MNET.2015.7064899

@Article{7064899,  author={P. {Ameigeiras} and J. J. {Ramos-munoz} and L. {Schumacher} and J. {Prados-Garzon} and J. {Navarro-Ortiz} and J. M. {Lopez-soler}},  journal={{IEEE} Network},   title={Link-level access cloud architecture design based on SDN for 5G networks},   year={2015},  volume={29},  number={2},  pages={24-31},  doi={10.1109/MNET.2015.7064899}, impact={(IF=2.899, Q1)}}

"Characteristics of mobile youtube traffic", J. J. Ramos-munoz, J. Prados-Garzon, P. Ameigeiras, J. Navarro-Ortiz, J. M. Lopez-soler, IEEE Wireless Communications, 21 (1), pp. 18-25, 2014. DOI: 10.1109/MWC.2014.6757893

@Article{6757893,  author={J. J. {Ramos-munoz} and J. {Prados-Garzon} and P. {Ameigeiras} and J. {Navarro-Ortiz} and J. M. {Lopez-soler}},  journal={{IEEE} Wireless Communications},   title={Characteristics of mobile youtube traffic},   year={2014},  volume={21},  number={1},  pages={18-25},  doi={10.1109/MWC.2014.6757893}, impact={(IF=6.524, Q1)}}

"Removing redundant TCP functionalities in wired-cum-wireless networks with IEEE 802.11e HCCA support", Jorge Navarro-Ortiz, Pablo Ameigeiras, Juan J. Ramos-Munoz, Juan M. Lopez-Soler, International Journal of Communication Systems, 27 (11), pp. 3352-3367, 2014. DOI: https://doi.org/10.1002/dac.2546

SUMMARY The TCP was originally designed for wired networks, assuming transmission errors were negligible. Actually, any acknowledgment time-out unconditionally triggers the congestion control mechanism, even in wireless networks in which this assumption is not valid. Consequently, in wireless networks, TCP performance significantly degrades. To avoid this degradation, this paper proposes the so-called split TCP and UDP. In this approach, the access point splits the TCP connection and uses a customized and lighter transport protocol for the wireless segment. It takes advantage of the IEEE 802.11e Hybrid Coordination Function Controlled Channel Access (HCCA) mechanisms to remove redundant TCP functionalities. Specifically, the HCCA scheduler allows disabling of the congestion control in the wireless link. Similarly, the IEEE 802.11e error control service makes possible to eliminate TCP acknowledgments, therefore reducing the TCP protocol overhead. Finally, the usage of an HCCA scheduler permits providing fairness among the different data flows. The proposed split scheme is evaluated via extensive simulations. Results show that split TCP and User Datagram Protocol outperforms the analyzed TCP flavors specifically designed for wireless environments and the split TCP solution, achieving up to 95\% of end-user throughput gain. Furthermore, the proposed solution is TCP friendly because TCP flows are not degraded by the presence of flows by using this approach. Copyright 2013 John Wiley \& Sons, Ltd.

@Article{redundanttcp,
author = {Navarro-Ortiz, Jorge and Ameigeiras, Pablo and Ramos-Munoz, Juan J. and Lopez-Soler, Juan M.},
title = {Removing redundant TCP functionalities in wired-cum-wireless networks with {IEEE} 802.11e HCCA support},
journal = {International Journal of Communication Systems},
volume = {27},
number = {11},
pages = {3352-3367},
keywords = {802.11e, HCCA, performance enhancing proxy, TCP},
doi = {https://doi.org/10.1002/dac.2546},
eprint = {https://onlinelibrary.wiley.com/doi/pdf/10.1002/dac.2546},
abstract = {SUMMARY The TCP was originally designed for wired networks, assuming transmission errors were negligible. Actually, any acknowledgment time-out unconditionally triggers the congestion control mechanism, even in wireless networks in which this assumption is not valid. Consequently, in wireless networks, TCP performance significantly degrades. To avoid this degradation, this paper proposes the so-called split TCP and UDP. In this approach, the access point splits the TCP connection and uses a customized and lighter transport protocol for the wireless segment. It takes advantage of the {IEEE} 802.11e Hybrid Coordination Function Controlled Channel Access (HCCA) mechanisms to remove redundant TCP functionalities. Specifically, the HCCA scheduler allows disabling of the congestion control in the wireless link. Similarly, the {IEEE} 802.11e error control service makes possible to eliminate TCP acknowledgments, therefore reducing the TCP protocol overhead. Finally, the usage of an HCCA scheduler permits providing fairness among the different data flows. The proposed split scheme is evaluated via extensive simulations. Results show that split TCP and User Datagram Protocol outperforms the analyzed TCP flavors specifically designed for wireless environments and the split TCP solution, achieving up to 95\% of end-user throughput gain. Furthermore, the proposed solution is TCP friendly because TCP flows are not degraded by the presence of flows by using this approach. Copyright 2013 John Wiley \& Sons, Ltd.},
year = {2014},
impact={(IF=1.463, Q3)}
}

"A QoE-Aware Scheduler for HTTP Progressive Video in OFDMA Systems", J. Navarro-Ortiz, P. Ameigeiras, J. M. Lopez-Soler, J. Lorca-Hernando, Q. Perez-Tarrero, R. Garcia-Perez, IEEE Communications Letters, 17 (4), pp. 677-680, 2013. DOI: 10.1109/LCOMM.2013.021913.122716

@Article{6511522,  author={J. {Navarro-Ortiz} and P. {Ameigeiras} and J. M. {Lopez-Soler} and J. {Lorca-Hernando} and Q. {Perez-Tarrero} and R. {Garcia-Perez}},  journal={{IEEE} Communications Letters},   title={A QoE-Aware Scheduler for HTTP Progressive Video in OFDMA Systems},   year={2013},  volume={17},  number={4},  pages={677-680},  doi={10.1109/LCOMM.2013.021913.122716}, impact={(IF=1.463, Q2)}}

"RELOAD extension for data discovery and transfer in data-centric publish/subscribe environments", Jose M. Lopez-Vega, Gonzalo Camarillo, Javier Povedano-Molina, Juan M. Lopez-Soler, Computer Standards & Interfaces, 36 (1), pp. 110-121, 2013. DOI: https://doi.org/10.1016/j.csi.2013.06.006

Data-Centric Publish-Subscribe (DCPS) is an architectural and communication paradigm where applications exchange data-content through a common data-space using publish-subscribe interactions. Due to its focus on data-content, DCPS is especially suitable for deploying IoT systems. However, some problems must be solved to support large deployments. In this paper we define a novel extension to the IETF REsource LOcation And Discovery (RELOAD) protocol specification for providing content discovery and transfer in big scale IoT deployments. We have conducted a set of experiments over multiple simulated networks of 500 to 10,000 nodes that demonstrate the viability, scalability, and robustness of our proposal.

@article{LOPEZVEGA2013110,
title = {RELOAD extension for data discovery and transfer in data-centric publish/subscribe environments},
journal = {Computer Standards & Interfaces},
volume = {36},
number = {1},
pages = {110-121},
year = {2013},
issn = {0920-5489},
doi = {https://doi.org/10.1016/j.csi.2013.06.006},
url = {https://www.sciencedirect.com/science/article/pii/S0920548913000743},
author = {Jose M. Lopez-Vega and Gonzalo Camarillo and Javier Povedano-Molina and Juan M. Lopez-Soler},
keywords = {Data-centric, Publish-subscribe, Discovery, Rendezvous, Reload, DDS},
abstract = {Data-Centric Publish-Subscribe (DCPS) is an architectural and communication paradigm where applications exchange data-content through a common data-space using publish-subscribe interactions. Due to its focus on data-content, DCPS is especially suitable for deploying IoT systems. However, some problems must be solved to support large deployments. In this paper we define a novel extension to the IETF REsource LOcation And Discovery (RELOAD) protocol specification for providing content discovery and transfer in big scale IoT deployments. We have conducted a set of experiments over multiple simulated networks of 500 to 10,000 nodes that demonstrate the viability, scalability, and robustness of our proposal.},impact={(IF=1,17,Q2)}}

"A content-aware bridging service for publish/subscribe environments", Jose M. Lopez-Vega, Javier Povedano-Molina, Gerardo Pardo-Castellote, Juan M. Lopez-Soler, Journal of Systems and Software, 86 (1), pp. 108-124, 2013. DOI: https://doi.org/10.1016/j.jss.2012.07.033

The OMG DDS (Data Distribution Service) standard specifies a middleware for distributing real-time data using a publish-subscribe data-centric approach. Until now, DDS systems have been restricted to a single and isolated DDS domain, normally deployed within a single multicast-enabled LAN. As systems grow larger, the need to interconnect different DDS domains arises. In this paper, we consider the problem of communicating disjoint data-spaces that may use different schemas to refer to similar information. In this regard, we propose a DDS interconnection service capable of bridging DDS domains as well as adapting between different data schemas. A key benefit of our approach is that is compliant with the latest OMG specifications, thus the proposed service does not require any modifications to DDS applications. The paper identifies the requirements for DDS data-spaces interconnection, presents an architecture that responds to those requirements, and concludes with experimental results gathered on our prototype implementation. We show that the impact of the service on the communications performance is well within the acceptable limits for most real-world uses of DDS (latency overhead is of the order of hundreds of microseconds). Reported results also indicate that our service interconnects remote data-spaces efficiently and reduces the network traffic almost N times, with N being the number of final data subscribers.

@article{LOPEZVEGA2013108,
title = {A content-aware bridging service for publish/subscribe environments},
journal = {Journal of Systems and Software},
volume = {86},
number = {1},
pages = {108-124},
year = {2013},
issn = {0164-1212},
doi = {https://doi.org/10.1016/j.jss.2012.07.033},
url = {https://www.sciencedirect.com/science/article/pii/S0164121212002142},
author = {Jose M. Lopez-Vega and Javier Povedano-Molina and Gerardo Pardo-Castellote and Juan M. Lopez-Soler},
keywords = {Bridging, Interoperability, Data Distribution Service, Middleware, Network communications},
abstract = {The OMG DDS (Data Distribution Service) standard specifies a middleware for distributing real-time data using a publish-subscribe data-centric approach. Until now, DDS systems have been restricted to a single and isolated DDS domain, normally deployed within a single multicast-enabled LAN. As systems grow larger, the need to interconnect different DDS domains arises. In this paper, we consider the problem of communicating disjoint data-spaces that may use different schemas to refer to similar information. In this regard, we propose a DDS interconnection service capable of bridging DDS domains as well as adapting between different data schemas. A key benefit of our approach is that is compliant with the latest OMG specifications, thus the proposed service does not require any modifications to DDS applications. The paper identifies the requirements for DDS data-spaces interconnection, presents an architecture that responds to those requirements, and concludes with experimental results gathered on our prototype implementation. We show that the impact of the service on the communications performance is well within the acceptable limits for most real-world uses of DDS (latency overhead is of the order of hundreds of microseconds). Reported results also indicate that our service interconnects remote data-spaces efficiently and reduces the network traffic almost N times, with N being the number of final data subscribers.}, impact={(IF=1.245, Q2)}}

"DARGOS: A highly adaptable and scalable monitoring architecture for multi-tenant Clouds", Javier Povedano-Molina, Jose M. Lopez-Vega, Juan M. Lopez-Soler, Antonio Corradi, Luca Foschini, Future Generation Computer Systems, 29 (8), pp. 2041-2056, 2013. DOI: https://doi.org/10.1016/j.future.2013.04.022

One of the most important features in Cloud environments is to know the status and the availability of the physical resources and services present in the current infrastructure. A full knowledge and control of the current status of those resources enables Cloud administrators to design better Cloud provisioning strategies and to avoid SLA violations. However, it is not easy to manage such information in a reliable and scalable way, especially when we consider Cloud environments used and shared by several tenants and when we need to harmonize their different monitoring needs at different Cloud software stack layers. To cope with these issues, we propose Distributed Architecture for Resource manaGement and mOnitoring in cloudS (DARGOS), a completely distributed and highly efficient Cloud monitoring architecture to disseminate resource monitoring information. DARGOS ensures an accurate measurement of physical and virtual resources in the Cloud keeping at the same time a low overhead. In addition, DARGOS is flexible and adaptable and allows defining and monitoring new metrics easily. The proposed monitoring architecture and related tools have been integrated into a real Cloud deployment based on the OpenStack platform: they are openly available for the research community and include a Web-based customizable Cloud monitoring console. We report experimental results to assess our architecture and quantitatively compare it with a selection of other Cloud monitoring systems similar to ours showing that DARGOS introduces a very limited and scalable monitoring overhead.

@article{POVEDANOMOLINA20132041,
title = {DARGOS: A highly adaptable and scalable monitoring architecture for multi-tenant Clouds},
journal = {Future Generation Computer Systems},
volume = {29},
number = {8},
pages = {2041-2056},
year = {2013},
note = {Including Special sections: Advanced Cloud Monitoring Systems & The fourth IEEE International Conference on e-Science 2011 e-Science Applications and Tools & Cluster, Grid, and Cloud Computing},
issn = {0167-739X},
doi = {https://doi.org/10.1016/j.future.2013.04.022},
url = {https://www.sciencedirect.com/science/article/pii/S0167739X13000824},
author = {Javier Povedano-Molina and Jose M. Lopez-Vega and Juan M. Lopez-Soler and Antonio Corradi and Luca Foschini},
keywords = {Cloud monitoring, Cloud management, Data-centric communications, Publish-subscribe, DDS, Distributed Cloud management},
abstract = {One of the most important features in Cloud environments is to know the status and the availability of the physical resources and services present in the current infrastructure. A full knowledge and control of the current status of those resources enables Cloud administrators to design better Cloud provisioning strategies and to avoid SLA violations. However, it is not easy to manage such information in a reliable and scalable way, especially when we consider Cloud environments used and shared by several tenants and when we need to harmonize their different monitoring needs at different Cloud software stack layers. To cope with these issues, we propose Distributed Architecture for Resource manaGement and mOnitoring in cloudS (DARGOS), a completely distributed and highly efficient Cloud monitoring architecture to disseminate resource monitoring information. DARGOS ensures an accurate measurement of physical and virtual resources in the Cloud keeping at the same time a low overhead. In addition, DARGOS is flexible and adaptable and allows defining and monitoring new metrics easily. The proposed monitoring architecture and related tools have been integrated into a real Cloud deployment based on the OpenStack platform: they are openly available for the research community and include a Web-based customizable Cloud monitoring console. We report experimental results to assess our architecture and quantitatively compare it with a selection of other Cloud monitoring systems similar to ours showing that DARGOS introduces a very limited and scalable monitoring overhead.},
impact={(IF=2.639, Q1)}}

"Traffic models impact on OFDMA scheduling design", Pablo Ameigeiras, Yuanye Wang, Jorge Navarro-Ortiz, Preben E. Mogensen, Juan M. Lopez-Soler, EURASIP Journal on Wireless Communications and Networking, 2012 (1), pp. 61, 2012. DOI: 10.1186/1687-1499-2012-61

This article studies the impact on the design of scheduling algorithms for Orthogonal Frequency Division Multiple Access (OFDMA) systems of two traffic models described in the evaluation methodology proposals from standardization bodies: the full buffer and the finite buffer traffic models. The analysis concentrates on utility-based scheduling with an \^I\textpm-fair utility function for Non-Real Time (NRT) services. The results show that a gradient scheduling algorithm is able to maximize the aggregate utility over all the users when the less realistic full buffer model is adopted; but not when the finite buffer model is applied. The results also show that with the full buffer model a gradient scheduler exhibits a trade-off between average user throughput and the user throughput at 5\% outage, but it does not when the more realistic finite buffer is used. Therefore, it is concluded that designs of scheduling algorithms for NRT services for OFDMA systems carried out under the full buffer model assumption may fail to provide the desired performance benefits in realistic scenarios. Based on the results presented, a recommendation on scheduling design is provided.

@Article{Ameigeiras2012,
author={Ameigeiras, Pablo
and Wang, Yuanye
and Navarro-Ortiz, Jorge
and Mogensen, Preben E.
and Lopez-Soler, Juan M.},
title={Traffic models impact on OFDMA scheduling design},
journal={EURASIP Journal on Wireless Communications and Networking},
year={2012},
month={Feb},
day={24},
volume={2012},
number={1},
pages={61},
abstract={This article studies the impact on the design of scheduling algorithms for Orthogonal Frequency Division Multiple Access (OFDMA) systems of two traffic models described in the evaluation methodology proposals from standardization bodies: the full buffer and the finite buffer traffic models. The analysis concentrates on utility-based scheduling with an {\^I}{\textpm}-fair utility function for Non-Real Time (NRT) services. The results show that a gradient scheduling algorithm is able to maximize the aggregate utility over all the users when the less realistic full buffer model is adopted; but not when the finite buffer model is applied. The results also show that with the full buffer model a gradient scheduler exhibits a trade-off between average user throughput and the user throughput at 5{\%} outage, but it does not when the more realistic finite buffer is used. Therefore, it is concluded that designs of scheduling algorithms for NRT services for OFDMA systems carried out under the full buffer model assumption may fail to provide the desired performance benefits in realistic scenarios. Based on the results presented, a recommendation on scheduling design is provided.},
issn={1687-1499},
doi={10.1186/1687-1499-2012-61},
impact={(IF=0.540, Q3)}
}

"A Simple Model for Predicting the Number and Duration of Rebuffering Events for YouTube Flows", P. Ameigeiras, A. Azcona-Rivas, J. Navarro-Ortiz, J. J. Ramos-Munoz, J. M. Lopez-Soler, IEEE Communications Letters, 16 (2), pp. 278-280, 2012. DOI: 10.1109/LCOMM.2011.121311.111682

@Article{6109192,  author={P. {Ameigeiras} and A. {Azcona-Rivas} and J. {Navarro-Ortiz} and J. J. {Ramos-Munoz} and J. M. {Lopez-Soler}},  journal={{IEEE} Communications Letters},   title={A Simple Model for Predicting the Number and Duration of Rebuffering Events for YouTube Flows},   year={2012},  volume={16},  number={2},  pages={278-280},  doi={10.1109/LCOMM.2011.121311.111682}, impact={(IF=1.16, Q2)}}

"Analysis and modelling of YouTube traffic", Pablo Ameigeiras, Juan J. Ramos-Munoz, Jorge Navarro-Ortiz, J.M. Lopez-Soler, Transactions on Emerging Telecommunications Technologies, 23 (4), pp. 360-377, 2012. DOI: https://doi.org/10.1002/ett.2546

ABSTRACT YouTube currently accounts for a significant percentage of the Internet's global traffic. Hence, understanding the characteristics of the YouTube traffic generation pattern can provide a significant advantage in predicting user video quality and in enhancing network design. In this paper, we present a characterisation of the traffic generated by YouTube when accessed from a regular PC. On the basis of this characterisation, a YouTube server traffic generation model is proposed, which, for example, can be easily implemented in simulation tools. The derived characterisation and model are based on experimental evaluations of traffic generated by the application layer of YouTube servers. A YouTube server commences the download with an initial burst and later throttles down the generation rate. If the available bandwidth is reduced (e.g. in the presence of network congestion), the server behaves as if the data excess that cannot be transmitted because of the reduced bandwidth were accumulated at a server's buffer, which is later drained if the bandwidth availability is recovered. As we will show, the video clip encoding rate plays a relevant role in determining the traffic generation rate, and therefore, a cumulative density function for the most viewed video clips will be presented. The proposed traffic generation model was implemented in a YouTube emulation server, and the generated synthetic traffic traces were compared with downloads from the original YouTube server. The results show that the relative error between downloads from the emulation server and the original server does not exceed 6\% for the 90\% of the considered videos. Copyright 2012 John Wiley \& Sons, Ltd.

@Article{analysisyoutube,
author = {Ameigeiras, Pablo and Ramos-Munoz, Juan J. and Navarro-Ortiz, Jorge and Lopez-Soler, J.M.},
title = {Analysis and modelling of YouTube traffic},
journal = {Transactions on Emerging Telecommunications Technologies},
volume = {23},
number = {4},
pages = {360-377},
keywords = {YouTube, YouTube traffic generation, progressive download, YouTube data rate, YouTube application flow control, progressive download traffic generation},
doi = {https://doi.org/10.1002/ett.2546},
eprint = {https://onlinelibrary.wiley.com/doi/pdf/10.1002/ett.2546},
abstract = {ABSTRACT YouTube currently accounts for a significant percentage of the Internet's global traffic. Hence, understanding the characteristics of the YouTube traffic generation pattern can provide a significant advantage in predicting user video quality and in enhancing network design. In this paper, we present a characterisation of the traffic generated by YouTube when accessed from a regular PC. On the basis of this characterisation, a YouTube server traffic generation model is proposed, which, for example, can be easily implemented in simulation tools. The derived characterisation and model are based on experimental evaluations of traffic generated by the application layer of YouTube servers. A YouTube server commences the download with an initial burst and later throttles down the generation rate. If the available bandwidth is reduced (e.g. in the presence of network congestion), the server behaves as if the data excess that cannot be transmitted because of the reduced bandwidth were accumulated at a server's buffer, which is later drained if the bandwidth availability is recovered. As we will show, the video clip encoding rate plays a relevant role in determining the traffic generation rate, and therefore, a cumulative density function for the most viewed video clips will be presented. The proposed traffic generation model was implemented in a YouTube emulation server, and the generated synthetic traffic traces were compared with downloads from the original YouTube server. The results show that the relative error between downloads from the emulation server and the original server does not exceed 6\% for the 90\% of the considered videos. Copyright 2012 John Wiley \& Sons, Ltd.},
year = {2012},
impact={(IF=1.05, Q4)}
}

"User-Level Quality Assessment of a Delay-Aware Packet Dropping Scheme for VoIP", Erika Patricia Alvarez-Flores, Juan Jose Ramos-Munoz, Jorge Navarro-Ortiz, Pablo Ameigeiras, Juan Manuel Lopez-Soler, Network Protocols and Algorithms, 3 (3), pp. 38-66, 2011. DOI: 10.5296/npa.v3i3.1113

To deal with congestion control in internet protocol (IP) networks, different active queue management schemes have been successfully proposed. However, many of these schemes do not take into consideration the particular Voice over Internet Protocol (VoIP) requirements, thereby potentially penalizing this traffic. In this paper, we propose and evaluate a dropping packet selection algorithm for queue management schemes. This algorithm, called Drop-SwD, protects VoIP traffic without affecting other User Datagram Protocol (UDP) and Transmission Control Protocol (TCP) traffic. Additionally, to preserve the quality of the VoIP service, the proposed algorithm selects the lowest quality packets (with less impact on the subjective quality) to be dropped.The application of the algorithm in different active queue management schemes is evaluated using objective and subjective quality metrics and intelligibility metrics as well. As a result, we show that Drop-SwD improves the final quality of the voice packets flow, without degrading the performance of other traffic class, with respect to the packet dropping schemes of reference.

@Article{alvarezflores2011,
	title = {User-{Level} {Quality} {Assessment} of a {Delay}-{Aware} {Packet} {Dropping} {Scheme} for {VoIP}},
	volume = {3},
	copyright = {Copyright (c)},
	issn = {1943-3581},
	doi = {10.5296/npa.v3i3.1113},
	abstract = {To deal with congestion control in internet protocol (IP) networks, different active queue management schemes have been successfully proposed. However, many of these schemes do not take into consideration the particular Voice over Internet Protocol (VoIP) requirements, thereby potentially penalizing this traffic. In this paper, we propose and evaluate a dropping packet selection algorithm for queue management schemes. This algorithm, called Drop-SwD, protects VoIP traffic without affecting other User Datagram Protocol (UDP) and Transmission Control Protocol (TCP) traffic. Additionally, to preserve the quality of the VoIP service, the proposed algorithm selects the lowest quality packets (with less impact on the subjective quality) to be dropped.The application of the algorithm in different active queue management schemes is evaluated using objective and subjective quality metrics and intelligibility metrics as well. As a result, we show that Drop-SwD improves the final quality of the voice packets flow, without degrading the performance of other traffic class, with respect to the packet dropping schemes of reference.},
	language = {en},
	number = {3},
	urldate = {2021-03-21},
	journal = {Network Protocols and Algorithms},
	author = {Alvarez-Flores, Erika Patricia and Ramos-Munoz, Juan Jose and Navarro-Ortiz, Jorge and Ameigeiras, Pablo and Lopez-Soler, Juan Manuel},
	month = December,
	year = {2011},
	keywords = {AQM, Dropping, QoE, QoS, Service Differentiation, VoIP.},
	pages = {38-66},
}

"Bloom filter-based discovery protocol for DDS middleware", Javier Sanchez-Monedero, Javier Povedano-Molina, Jose M. Lopez-Vega, Juan M. Lopez-Soler, Journal of Parallel and Distributed Computing, 71 (10), pp. 1305-1317, 2011. DOI: https://doi.org/10.1016/j.jpdc.2011.05.001

The Data Distribution Service (DDS) middleware has recently been standardized by the OMG. Prior to data communication, a discovery protocol had to locate and obtain remote DDS entities and their attributes. Specifically, DDS discovery matches the DataWriters (DWs) and DataReaders (DRs) entities (Endpoints) situated in different network nodes. DDS specification does not specify how this discovery is translated into the wire. To provide interoperability and transparency between different DDS implementations, the OMG has standardized the DDS Interoperability Wire Protocol (DDS-RTPS). Any compliant DDS-RTPS implementation must support at least the SDP (Simple Discovery Protocol). The SDP works in relatively small or medium networks but it may not scale as the number of DDS Endpoints increases. This paper addresses the design and evaluation of an SDP alternative which uses Bloom Filters (BF) that increases DDS scalability. BFs use Hash functions for space-efficient probabilistic data set representation. We provide both analytical and experimental studies. Results show that our approach can improve the discovery process (in terms of network load and node resource consumption), especially in those scenarios with large Endpoint per Participant ratios.

@article{SANCHEZMONEDERO20111305,
title = {Bloom filter-based discovery protocol for DDS middleware},
journal = {Journal of Parallel and Distributed Computing},
volume = {71},
number = {10},
pages = {1305-1317},
year = {2011},
issn = {0743-7315},
doi = {https://doi.org/10.1016/j.jpdc.2011.05.001},
url = {https://www.sciencedirect.com/science/article/pii/S0743731511000876},
author = {Javier Sanchez-Monedero and Javier Povedano-Molina and Jose M. Lopez-Vega and Juan M. Lopez-Soler},
keywords = {DDS, Data Distribution Service, Discovery, Middleware, Bloom filter, Peer-to-peer, RTPS},
abstract = {The Data Distribution Service (DDS) middleware has recently been standardized by the OMG. Prior to data communication, a discovery protocol had to locate and obtain remote DDS entities and their attributes. Specifically, DDS discovery matches the DataWriters (DWs) and DataReaders (DRs) entities (Endpoints) situated in different network nodes. DDS specification does not specify how this discovery is translated into the wire. To provide interoperability and transparency between different DDS implementations, the OMG has standardized the DDS Interoperability Wire Protocol (DDS-RTPS). Any compliant DDS-RTPS implementation must support at least the SDP (Simple Discovery Protocol). The SDP works in relatively small or medium networks but it may not scale as the number of DDS Endpoints increases. This paper addresses the design and evaluation of an SDP alternative which uses Bloom Filters (BF) that increases DDS scalability. BFs use Hash functions for space-efficient probabilistic data set representation. We provide both analytical and experimental studies. Results show that our approach can improve the discovery process (in terms of network load and node resource consumption), especially in those scenarios with large Endpoint per Participant ratios.}, impact={(IF=1.08, Q2)}}

"Selective Packet Dropping for VoIP and TCP Flows", Erika P. Alvarez Flores, Juan J. Ramos-Munoz, Pablo Ameigeiras, Juan M. Lopez-Soler, Telecommunication Systems Journal, 46 (1), 2011. DOI: https://doi.org/10.1007/s11235-009-9252-z

The adoption of the IP protocol for serving diverse applications arises the need for mechanisms to prevent network congestion in scenarios with different traffic
types (responsive and unresponsive) sharing limited network
resources. To deal with this issue, a number of algorithms
for active queue management (AQM) have been proposed.
However, most of them do not observe the traffic type and
usually disregard this knowledge. In this way, the provided
service could not comply with the distinctive requirements
of the different type of traffic, such as VoIP services, which
demand bounded packet latency and loss rate.
This paper proposes a new approach to be applied for
preventing network congestion in AQM routers. Our scheme
includes a procedure for selecting the packet to be dropped
that improves the fairness among different classes of flows.
We evaluate the use of this approach on distinct AQM
schemes in scenarios with different degrees of UDP and
TCP traffic mix. Objective and subjective performance measurements are reported. The experimental evaluation indicates that our approach improves the fairness among different traffic classes without using any packet scheduler. In fact, it also improves the VoIP traffic performance in terms of packet dropping probability, MOS (Mean Opinion Score) and intelligibility. We also show that our approach has
no negative impact on the packet delay. Moreover, it is not achieved at the expense of TCP responsive traffic.

@article{ERIKA2011,
title = {Selective Packet Dropping for VoIP and TCP Flows},
journal = {Telecommunication Systems Journal},
volume = {46},
number = {1},
year = {2011},
issn = {1018-4864},
doi = {https://doi.org/10.1007/s11235-009-9252-z},
url = {https://link.springer.com/content/pdf/10.1007%2Fs11235-009-9252-z.pdf},
author = {Erika P. Alvarez Flores and Juan J. Ramos-Munoz and Pablo Ameigeiras and Juan M. Lopez-Soler},
keywords = {Active queue management, RED, VoIP, TCP-friendly, Fairness, Traffic mix},
abstract = {The adoption of the IP protocol for serving diverse applications arises the need for mechanisms to prevent network congestion in scenarios with different traffic
types (responsive and unresponsive) sharing limited network
resources. To deal with this issue, a number of algorithms
for active queue management (AQM) have been proposed.
However, most of them do not observe the traffic type and
usually disregard this knowledge. In this way, the provided
service could not comply with the distinctive requirements
of the different type of traffic, such as VoIP services, which
demand bounded packet latency and loss rate.
This paper proposes a new approach to be applied for
preventing network congestion in AQM routers. Our scheme
includes a procedure for selecting the packet to be dropped
that improves the fairness among different classes of flows.
We evaluate the use of this approach on distinct AQM
schemes in scenarios with different degrees of UDP and
TCP traffic mix. Objective and subjective performance measurements are reported. The experimental evaluation indicates that our approach improves the fairness among different traffic classes without using any packet scheduler. In fact, it also improves the VoIP traffic performance in terms of packet dropping probability, MOS (Mean Opinion Score) and intelligibility. We also show that our approach has
no negative impact on the packet delay. Moreover, it is not achieved at the expense of TCP responsive traffic.}, impact={(IF=0.67, Q3)}}

"QoE oriented cross-layer design of a resource allocation algorithm in beyond 3G systems", Pablo Ameigeiras, Juan J. Ramos-Munoz, Jorge Navarro-Ortiz, Preben Mogensen, Juan M. Lopez-Soler, Computer Communications, 33 (5), pp. 571-582, 2010. DOI: https://doi.org/10.1016/j.comcom.2009.10.016

The provision of high speed access to Internet and IP-based services is one of the main goals of beyond 3G (B3G) wireless systems. These systems will benefit from cross-layer protocol designs that will introduce interactions between different layers to obtain performance gains. The majority of the research in the field of cross-layer in B3G systems aims at improving quality of service (QoS) system centric metrics such as spectral efficiency, service latency, delay variation (jitter), etc. However, minor attention has been paid to the satisfaction of the subjective quality requirements from human users. With the goal of incorporating the subjective human perception into the cross-layer design of B3G systems, this work carries out an experimental survey of the sensitivity of the user subjective quality to the service response time for the Web browsing application. From the experimental results, a mapping from service response time and user data rate (provided by the wireless link) to mean opinion score (MOS) is derived. The presented results will show that the Web page size plays an important role in the mapping function. The derived mapping function is incorporated into a radio resource allocation algorithm for orthogonal frequency division multiple access (OFDMA) systems. This incorporation is carried out maximizing the aggregate utility over all the users in the cell. Its performance has been compared to that of the multicarrier proportional fair (MPF) under heavy load conditions with a 3G LTE simulator. The results have shown that the proposed methodology can provide an interesting enhancement of the user experienced quality compared to the MPF algorithm.

@Article{AMEIGEIRAS2010571,
title = {QoE oriented cross-layer design of a resource allocation algorithm in beyond 3G systems},
journal = {Computer Communications},
volume = {33},
number = {5},
pages = {571-582},
year = {2010},
issn = {0140-3664},
doi = {https://doi.org/10.1016/j.comcom.2009.10.016},
author = {Pablo Ameigeiras and Juan J. Ramos-Munoz and Jorge Navarro-Ortiz and Preben Mogensen and Juan M. Lopez-Soler},
keywords = {HTTP subjective quality survey, Quality of experience (QoE), Cross-layer design, Utility function, Long term evolution},
abstract = {The provision of high speed access to Internet and IP-based services is one of the main goals of beyond 3G (B3G) wireless systems. These systems will benefit from cross-layer protocol designs that will introduce interactions between different layers to obtain performance gains. The majority of the research in the field of cross-layer in B3G systems aims at improving quality of service (QoS) system centric metrics such as spectral efficiency, service latency, delay variation (jitter), etc. However, minor attention has been paid to the satisfaction of the subjective quality requirements from human users. With the goal of incorporating the subjective human perception into the cross-layer design of B3G systems, this work carries out an experimental survey of the sensitivity of the user subjective quality to the service response time for the Web browsing application. From the experimental results, a mapping from service response time and user data rate (provided by the wireless link) to mean opinion score (MOS) is derived. The presented results will show that the Web page size plays an important role in the mapping function. The derived mapping function is incorporated into a radio resource allocation algorithm for orthogonal frequency division multiple access (OFDMA) systems. This incorporation is carried out maximizing the aggregate utility over all the users in the cell. Its performance has been compared to that of the multicarrier proportional fair (MPF) under heavy load conditions with a 3G LTE simulator. The results have shown that the proposed methodology can provide an interesting enhancement of the user experienced quality compared to the MPF algorithm.},
impact={(IF=0.816, Q2)}
}

"Intelligibility Evaluation of a VoIP Multi-flow Block Interleaver", Ramos-Munoz Juan J., Gomez Angel, Lopez-Soler Juan M., Active and Programmable Networks. IWAN 2005. Lecture Notes in Computer Science, 4388, 2009. DOI: https://doi.org/10.1007/978-3-642-00972-3_18

This work contributes to demonstrate what perceptual benefits can be expected by adding some processing capabilities to the network nodes for the class of interactive audio streaming applications. In particular, we propose a new voice stream multi-flow block interleaver and we show that it provides an intelligibility performance very close to the reference end-to-end interleaver, even under conditions where the end-to-end interleaving is unfeasible.

@article{RAMOS2009,
title = {Intelligibility Evaluation of a VoIP Multi-flow Block Interleaver},
journal = {Active and Programmable Networks. IWAN 2005. Lecture Notes in Computer Science},
volume = {4388},
year = {2009},
doi = {https://doi.org/10.1007/978-3-642-00972-3_18},
url = {https://link.springer.com/chapter/10.1007/978-3-642-00972-3_18},
author = {Ramos-Munoz Juan J. and Gomez Angel and Lopez-Soler Juan M.},
keywords = {VoIP subjective evaluation, interleaving, speech recognition},
abstract = {This work contributes to demonstrate what perceptual benefits can be expected by adding some processing capabilities to the network nodes for the class of interactive audio streaming applications. In particular, we propose a new voice stream multi-flow block interleaver and we show that it provides an intelligibility performance very close to the reference end-to-end interleaver, even under conditions where the end-to-end interleaving is unfeasible.}}

"An 802.11e HCCA scheduler with an end-to-end quality aware territory method", Jorge Navarro-Ortiz, Pablo Ameigeiras, Juan J. Ramos-Munoz, Juan M. Lopez-Soler, Computer Communications, 32 (11), pp. 1281-1297, 2009. DOI: https://doi.org/10.1016/j.comcom.2008.12.014

In this paper we present a solution for the IEEE 802.11e HCCA (Hybrid coordination function Controlled Channel Access) mechanism which aims both at supporting strict real-time traffic requirements and, simultaneously, at handling TCP applications efficiently. Our proposal combines a packet scheduler and a dynamic resource allocation algorithm. The scheduling discipline is based on the Monolithic Shaper-Scheduler, which is a modification of a General Processor Sharing (GPS) related scheduler. It supports minimum-bandwidth and delay guarantees and, at the same time, it achieves the optimal latency of all the GPS-related schedulers. In addition, our innovative resource allocation procedure, called the territory method, aims at prioritizing real time services and at improving the performance of TCP applications. For this purpose, it splits the wireless channel capacity (in terms of transmission opportunities) into different territories for the different types of traffic, taking into account the end-to-end network dynamics. In order to give support to the desired applications, we consider the following traffic classes: conversational, streaming, interactive and best-effort. The so called territories shrink or expand depending on the current quality experienced by the corresponding traffic class. We evaluated the performance of our solution through extensive simulations in a heterogeneous wired-cum-wireless scenario under different traffic conditions. Additionally, we compare our proposal to other HCCA scheduling algorithms, the HCCA reference scheduler and Fair Hybrid Coordination Function (FHCF). The results show that the combination of the MSS and the territory method obtains higher system capacity for VoIP traffic (up to 32 users) in the simulated scenario, compared to FHCF and the HCCA reference scheduler (13 users). In addition, the MSS with the territory method also improves the throughput of TCP sources (one FTP application achieves between 6.1 Mbps without VoIP traffic and 2.1 Mbps with 20 VoIP users) compared to the reference scheduler (at most 388 kbps) and FHCF (with a maximum FTP throughput of 4.8 Mbps).

@Article{NAVARROORTIZ20091281,
title = {An 802.11e {HCCA} scheduler with an end-to-end quality aware territory method},
journal = {Computer Communications},
volume = {32},
number = {11},
pages = {1281-1297},
year = {2009},
note = {Special Issue of Computer Communications on Heterogeneous Networking for Quality, Reliability, Security, and Robustness - Part I},
issn = {0140-3664},
doi = {https://doi.org/10.1016/j.comcom.2008.12.014},
author = {Jorge Navarro-Ortiz and Pablo Ameigeiras and Juan J. Ramos-Munoz and Juan M. Lopez-Soler},
keywords = {802.11e, HCCA, Quality of Experience, Scheduler, Resource allocation},
abstract = {In this paper we present a solution for the {IEEE} 802.11e HCCA (Hybrid coordination function Controlled Channel Access) mechanism which aims both at supporting strict real-time traffic requirements and, simultaneously, at handling TCP applications efficiently. Our proposal combines a packet scheduler and a dynamic resource allocation algorithm. The scheduling discipline is based on the Monolithic Shaper-Scheduler, which is a modification of a General Processor Sharing (GPS) related scheduler. It supports minimum-bandwidth and delay guarantees and, at the same time, it achieves the optimal latency of all the GPS-related schedulers. In addition, our innovative resource allocation procedure, called the territory method, aims at prioritizing real time services and at improving the performance of TCP applications. For this purpose, it splits the wireless channel capacity (in terms of transmission opportunities) into different territories for the different types of traffic, taking into account the end-to-end network dynamics. In order to give support to the desired applications, we consider the following traffic classes: conversational, streaming, interactive and best-effort. The so called territories shrink or expand depending on the current quality experienced by the corresponding traffic class. We evaluated the performance of our solution through extensive simulations in a heterogeneous wired-cum-wireless scenario under different traffic conditions. Additionally, we compare our proposal to other HCCA scheduling algorithms, the HCCA reference scheduler and Fair Hybrid Coordination Function (FHCF). The results show that the combination of the MSS and the territory method obtains higher system capacity for VoIP traffic (up to 32 users) in the simulated scenario, compared to FHCF and the HCCA reference scheduler (13 users). In addition, the MSS with the territory method also improves the throughput of TCP sources (one FTP application achieves between 6.1 Mbps without VoIP traffic and 2.1 Mbps with 20 VoIP users) compared to the reference scheduler (at most 388 kbps) and FHCF (with a maximum FTP throughput of 4.8 Mbps).},
impact={(IF=0.933, Q2)}
}

"BOOTES-IR: Near IR Follow-up GRB Observations by a Robotic System", J. Castro-Tirado, A. de Ugarte Postigo, M. Jelinek, S. Castillo Carrion, T. J. Mateo Sanguino, P. Kubanek, F. Zerbi, P. Amado, C. Cardenas, A. Claret, J. Gorosabel, S. Martin, M. A. Sanchez, P. Garcia Teodoro, J. M. Castro Ceron, J. Diaz Verdejo, J. M. Lopez Soler, J. A. Berna Galiano, J. Casares, J. Fabregat, C. Sanchez Fernandez, P. Conconi, S. Guziy, F. Vitaly, Nuovo Cimento Della Societa Italiana di Fisica. C, Geophysics and Space Physics., 28, 2005. DOI: https://doi.org/10.1393/ncc/i2005-10138-9

BOOTES-IR is the extension of the BOOTES experiment, which
operates in Southern Spain since 1998, to the near IR (NIR). The goal is to follow
up the early stage of the gamma ray burst (GRB) afterglow emission in the NIR,
alike BOOTES does already at optical wavelengths. The scientific case that drives
the BOOTES-IR performance is the study of GRBs with the support of spacecraft
like INTEGRAL, SWIFT and GLAST. Given that the afterglow emission in both,
the NIR and the optical, in the instances immediately following a GRB, is extremely
bright (reached V = 8.9 in one case), it should be possible to detect this prompt
emission at NIR wavelengths too. The combined observations by BOOTES-IR and
BOOTES-1 and BOOTES-2 will allow for real time identification of trustworthy
candidates to have a high redshift (z > 5). It is expected that, few minutes after
a GRB, the IR magnitudes be H ? 7–10, hence very high quality spectra can be
obtained for objects as far as z = 10 by larger instruments.

@article{CASTRO2005,
title = {BOOTES-IR: Near IR Follow-up GRB Observations by a Robotic System},
journal = {Nuovo Cimento Della Societa Italiana di Fisica. C, Geophysics and Space Physics.},
volume = {28},
issue = {4-5}
pages = {719-722},
year = {2005},
doi = {https://doi.org/10.1393/ncc/i2005-10138-9},
url = {https://www.sif.it/riviste/sif/ncc/econtents/2005/028/04-05/article/34},
author = {J. Castro-Tirado and A. de Ugarte Postigo and M. Jelinek and S. Castillo Carrion and T. J. Mateo Sanguino and P. Kubanek and  F. Zerbi and  P. Amado and  C. Cardenas and  A. Claret and  J. Gorosabel and  S. Martin and  M. A. Sanchez and  P. Garcia Teodoro and  J. M. Castro Ceron and  J. Diaz Verdejo and  J. M. Lopez Soler and  J. A. Berna Galiano and  J. Casares and  J. Fabregat and  C. Sanchez Fernandez and  P. Conconi and  S. Guziy and  F. Vitaly},
abstract = {BOOTES-IR is the extension of the BOOTES experiment, which
operates in Southern Spain since 1998, to the near IR (NIR). The goal is to follow
up the early stage of the gamma ray burst (GRB) afterglow emission in the NIR,
alike BOOTES does already at optical wavelengths. The scientific case that drives
the BOOTES-IR performance is the study of GRBs with the support of spacecraft
like INTEGRAL, SWIFT and GLAST. Given that the afterglow emission in both,
the NIR and the optical, in the instances immediately following a GRB, is extremely
bright (reached V = 8.9 in one case), it should be possible to detect this prompt
emission at NIR wavelengths too. The combined observations by BOOTES-IR and
BOOTES-1 and BOOTES-2 will allow for real time identification of trustworthy
candidates to have a high redshift (z > 5). It is expected that, few minutes after
a GRB, the IR magnitudes be H ? 7–10, hence very high quality spectra can be
obtained for objects as far as z = 10 by larger instruments.},
impact={(IF=0.31, Q4)}}

"Linear inter-frame dependencies for very low bit-rate speech coding", Juan M. Lopez-Soler, Victoria Sanchez, Angel de la Torre, Antonio J. Rubio-Ayuso, Speech Communication, 34 (4), pp. 333-349, 2001. DOI: https://doi.org/10.1016/S0167-6393(00)00039-X

We have studied experimentally the operational rate-distortion performance for very low bit-rate speech coding using linear inter-frame dependencies. We propose an algorithm that efficiently combines quantization and linear interpolation procedures. With a maximum delay of 200 ms, for the spectral envelope information and using line spectrum pair (LSP) parameters as input space the proposed algorithm performs best at rates of between 200 and 300 b/s. For comparison's sake several other procedures such as the multi-frame encoder (Kemp D., Collura J., Tremain T., Multi-Frame Coding of LPC Parameters at . In: IEEE ICASSP-91, 1991, pp. 609-612) and matrix quantizer (Tsao C., Gray R., Matrix quantizer design for LPC speech using the generalized Lloyd algorithm. IEEE Transactions on Acoustics, Speech, and Signal Processing ASSP-33, 1985, 537-545) are simulated. Furthermore, a mono-dimensional version of the proposed procedure is shown experimentally to provide the best operational rate-distortion trade-off when coding a parametric representation (pitch, gain and voicing information) of the excitation signal.

@article{LOPEZSOLER2001333,
title = {Linear inter-frame dependencies for very low bit-rate speech coding},
journal = {Speech Communication},
volume = {34},
number = {4},
pages = {333-349},
year = {2001},
issn = {0167-6393},
doi = {https://doi.org/10.1016/S0167-6393(00)00039-X},
url = {https://www.sciencedirect.com/science/article/pii/S016763930000039X},
author = {Juan M. Lopez-Soler and Victoria Sanchez and Angel {de la Torre} and Antonio J. Rubio-Ayuso},
keywords = {Speech coding, Quantization, Interpolation, Inter-frame dependencies},
abstract = {We have studied experimentally the operational rate-distortion performance for very low bit-rate speech coding using linear inter-frame dependencies. We propose an algorithm that efficiently combines quantization and linear interpolation procedures. With a maximum delay of 200 ms, for the spectral envelope information and using line spectrum pair (LSP) parameters as input space the proposed algorithm performs best at rates of between 200 and 300 b/s. For comparison's sake several other procedures such as the multi-frame encoder (Kemp D., Collura J., Tremain T., Multi-Frame Coding of LPC Parameters at . In: IEEE ICASSP-91, 1991, pp. 609-612) and matrix quantizer (Tsao C., Gray R., Matrix quantizer design for LPC speech using the generalized Lloyd algorithm. IEEE Transactions on Acoustics, Speech, and Signal Processing ASSP-33, 1985, 537-545) are simulated. Furthermore, a mono-dimensional version of the proposed procedure is shown experimentally to provide the best operational rate-distortion trade-off when coding a parametric representation (pitch, gain and voicing information) of the excitation signal.}, impact={(IF=0.45, Q3)}}

"A transcription-based approach to determine the difficulty of a speech recognition task", P. Garcia, A. J. Rubio, J. Diaz-Verdejo, M. C. Benitez, J. M. Lopez-Soler, IEEE Transactions on Speech and Audio Processing, 7 (3), pp. 339-342, 1999. DOI: 10.1109/89.759043

A new parameter for estimating the difficulty of a continuous speech recognition task, called speech decoding difficulty, is presented. It is obtained from the language model defined for the recognition task and the phonetic similarity between the transcriptions of the words that make up the vocabulary used. Two variants of the proposed task difficulty measure are introduced: ideal speech decoding difficulty (ISDD), which is not influenced by practical considerations on the recognition system implemented, and a second, more realistic variant, called practical speech decoding difficulty (PSDD) to study the performance of a specific recognition system when confronting a given task.

@ARTICLE{759043,  author={P. {Garcia} and A. J. {Rubio} and J. {Diaz-Verdejo} and M. C. {Benitez} and J. M. {Lopez-Soler}},  journal={IEEE Transactions on Speech and Audio Processing},   title={A transcription-based approach to determine the difficulty of a speech recognition task},   year={1999},  volume={7},  number={3},  pages={339-342},  abstract={A new parameter for estimating the difficulty of a continuous speech recognition task, called speech decoding difficulty, is presented. It is obtained from the language model defined for the recognition task and the phonetic similarity between the transcriptions of the words that make up the vocabulary used. Two variants of the proposed task difficulty measure are introduced: ideal speech decoding difficulty (ISDD), which is not influenced by practical considerations on the recognition system implemented, and a second, more realistic variant, called practical speech decoding difficulty (PSDD) to study the performance of a specific recognition system when confronting a given task.},  keywords={Speech recognition;Maximum likelihood decoding;Natural languages;Vocabulary;Acoustic testing;System testing;Character recognition;Parameter estimation;Loudspeakers;Maximum likelihood estimation},  doi={10.1109/89.759043},  ISSN={1558-2353},  month={May}, impact={(IF=0.66, Q2)}}

"A low-delay transform domain approach to trellis coded quantization", Victoria Sanchez, Antonio J. Rubio, Juan M. Lopez-Soler, Angel de la Torre, Antonio M. Peinado, Speech Communication, 21 (3), pp. 141-153, 1997. DOI: https://doi.org/10.1016/S0167-6393(97)00006-X

@article{SANCHEZ1997141,
title = {A low-delay transform domain approach to trellis coded quantization},
journal = {Speech Communication},
volume = {21},
number = {3},
pages = {141-153},
year = {1997},
issn = {0167-6393},
doi = {https://doi.org/10.1016/S0167-6393(97)00006-X},
url = {https://www.sciencedirect.com/science/article/pii/S016763939700006X},
author = {Victoria Sanchez and Antonio J. Rubio and Juan M. Lopez-Soler and Angel {de la Torre} and Antonio M. Peinado},
keywords = {Speech coding, Transform domain, Trellis coded quantization, Low-delay, Discrete cosine transform},
impact={(IF=0.42, Q2)}}

"Improvements in HMM-based isolated word recognition system", A.M. Peinado, J.M. Lopez, V.E. Sanchez, J.C. Segura, A.J. Rubio Ayuso, IEE Proceedings I (Communications, Speech and Vision), 138, pp. 201-206(5), 1991. DOI: 10.1049/ip-i-2.1991.0027

A speaker independent isolated word recognition system for voice activated robots is introduced. Since such an application requires a fast and accurate recognition system, discrete hidden Markov models and vector quantisation techniques have been used. Different initialisations for VQ and HMM training are tested to obtain improvements over the other systems. The final models can be evaluated using a temporal normalisation of the HMM scores. A threshold based rejector can also be established using this temporal normalisation.

@ARTICLE{peinado91,
   author = {A.M. Peinado and J.M. Lopez and V.E. Sanchez and J.C. Segura and A.J. Rubio Ayuso},
   keywords = {HMM scores;speaker-independent system;vector quantisation;training algorithms;discrete hidden Markov models;temporal normalisation;voice-activated robots;HMM-based isolated word recognition system;threshold-based rejector;},
   ISSN = {0956-3776},
   language = {English},
   abstract = {A speaker independent isolated word recognition system for voice activated robots is introduced. Since such an application requires a fast and accurate recognition system, discrete hidden Markov models and vector quantisation techniques have been used. Different initialisations for VQ and HMM training are tested to obtain improvements over the other systems. The final models can be evaluated using a temporal normalisation of the HMM scores. A threshold based rejector can also be established using this temporal normalisation.},
   title = {Improvements in HMM-based isolated word recognition system},
   journal = {IEE Proceedings I (Communications, Speech and Vision)},
   issue = {3},
   volume = {138},
   year = {1991},
   month = {June},
   pages = {201-206(5)},
   publisher ={},
   copyright = {The Institution of Electrical Engineers},
   url = {https://digital-library.theiet.org/content/journals/10.1049/ip-i-2.1991.0027},
doi = {10.1049/ip-i-2.1991.0027},
impact={(IF=0.18, Q3)}}

"Reduccion de la latencia en redes 5G-NR", Felix Delgado-Ferro, Jorge Navarro-Ortiz, Natalia Chinchilla-Romero, Juan Manuel Lopez-Soler, "XVI Jornadas de Ingenieria Telematica (JITEL 2023)", 2023

@INPROCEEDINGS{JITEL202323,
   author       = {Delgado-Ferro, Felix and Navarro-Ortiz, Jorge and Chinchilla-Romero, Natalia and Lopez-Soler, Juan Manuel},
   title        = {Reduccion de la latencia en redes 5G-NR},
   booktitle    = {XVI Jornadas de Ingenieria Telematica (JITEL 2023)},
   year         = {2023},
   month        = {November},
   address      = {Barcelona, Spain},
   COMMENTdoi   = {xxx},
   project      = {true5g|6gchronos|6ginspire},
   url          = {https://jitel2023.salleurl.edu/libro-actas}
}

"Converting a weather station into a LoRaWAN-enabled device", Jorge Navarro-Ortiz, Natalia Chinchilla-Romero, Felix Delgado-Ferro, Juan Jose Ramos-Munoz, Juan Manuel Lopez-Soler, "XVI Jornadas de Ingenieria Telematica (JITEL 2023)", 2023

@INPROCEEDINGS{JITEL202322,
   author       = {Navarro-Ortiz, Jorge and Chinchilla-Romero, Natalia and Delgado-Ferro, Felix and Ramos-Munoz, Juan Jose and Lopez-Soler, Juan Manuel},
   title        = {Converting a weather station into a LoRaWAN-enabled device},
   booktitle    = {XVI Jornadas de Ingenieria Telematica (JITEL 2023)},
   year         = {2023},
   month        = {November},
   address      = {Barcelona, Spain},
   COMMENTdoi   = {xxx},
   project      = {premonition|true5g|6gchronos},
   url          = {https://jitel2023.salleurl.edu/libro-actas}
}

"Transmission of images over LoRa", Jorge Navarro-Ortiz, Natalia Chinchilla-Romero, Felix Delgado-Ferro, Juan Jose Ramos-Munoz, Juan Manuel Lopez-Soler, Fernando Tejero-Rodriguez, "XVI Jornadas de Ingenieria Telematica (JITEL 2023)", 2023

@INPROCEEDINGS{JITEL20231,
   author       = {Navarro-Ortiz, Jorge and Chinchilla-Romero, Natalia and Delgado-Ferro, Felix and Ramos-Munoz, Juan Jose and Lopez-Soler, Juan Manuel and Tejero-Rodriguez, Fernando},
   title        = {Transmission of images over LoRa},
   booktitle    = {XVI Jornadas de Ingenieria Telematica (JITEL 2023)},
   year         = {2023},
   month        = {November},
   address      = {Barcelona, Spain},
   COMMENTdoi   = {xxx},
   project      = {premonition|true5g|6gchronos},
   url          = {https://jitel2023.salleurl.edu/libro-actas}
}

"URLLC Achieved Data Rate through Exploiting Multi-Connectivity in Industrial Private 5G Networks with Multi-WAT RANs", L. Chinchilla-Romero, J. Prados-Garzon, P. Munoz, P. Ameigeiras, J. M. Lopez-Soler, "IEEE Wireless Communications and Networking Conference (WCNC), Glasgow", 2023

@INPROCEEDINGS{URLLC_Ch23,
  author       = {L. Chinchilla-Romero and J. Prados-Garzon and P. Munoz and P. Ameigeiras and J. M. Lopez-Soler},
  booktitle    = {IEEE Wireless Communications and Networking Conference (WCNC), Glasgow},
  title        = {URLLC Achieved Data Rate through Exploiting Multi-Connectivity in Industrial Private 5G Networks with Multi-WAT RANs},
  year         = {2023},
  publisher    = {IEEE},
  month        = {Mar},
  address      = {Glasgow, Scotland, UK},
  COMMENTdoi   = {xxx},
  project      = {5gclarity|true5g|6gchronos},
  COMMENTurl   = {https://doi.org/xxx}}

"WIMUNET: Current research on Internet of (Robotic) things and 5G", P. Munoz, L. Chinchilla-Romero, N. Chinchilla-Romero, J. Prados-Garzon, O. Adamuz-Hinojosa, F. Delgado-Ferro, J. Caleya-Sanchez, P. Rodriguez-Martin, P. Ameigeiras, J. Navarro-Ortiz, J. J. Ramos-Munoz, J. M. Lopez-Soler, "Arqus Research Focus Forum - Artificial Intelligence and its applications, Granada", 2022

@INPROCEEDINGS{Auto_Ch23,
  author={P. Munoz and L. Chinchilla-Romero and N. Chinchilla-Romero and J. Prados-Garzon and O. Adamuz-Hinojosa and F. Delgado-Ferro and J. Caleya-Sanchez and P. Rodriguez-Martin and P. Ameigeiras and J. Navarro-Ortiz and J. J. Ramos-Munoz and J. M. Lopez-Soler},
  booktitle={Arqus Research Focus Forum - Artificial Intelligence and its applications, Granada},
  title={WIMUNET: Current research on Internet of (Robotic) things and 5G},
  year={2022},
  volume={},
  number={},
  pages={},
  project      = {5gclarity|true5g|6gchronos|premonition},
  doi={}}

"Analytical Model for the UE Blocking Probability in an OFDMA Cell providing GBR Slices", O. Adamuz-Hinojosa, P. Ameigeiras, P. Munoz, J. M. Lopez-Soler, "2021 IEEE Wireless Communications and Networking Conference (WCNC), Nanjing, China", pp. 1-7, 2021

When a network operator designs strategies for planning and operating Guaranteed Bit Rate (GBR) slices, there are inherent issues such as the under(over)-provisioning of radio resources. To avoid them, modeling the User Equipment (UE) blocking probability in each cell is key. This task is challenging due to the total required bandwidth depends on the channel quality of each UE and the spatio-temporal variations in the number of UE sessions. Under this context, we propose an analytical model to evaluate the UE blocking probability in an Orthogonal Frequency Division Multiple Access (OFDMA) cell. The main novelty of our model is the adoption of a multi-dimensional Erlang-B system which meets the reversibility property. This means our model is insensitive to the holding time distribution for the UE session. In addition, this property reduces the computational complexity of our model due to the solution for the state transition probabilities has product form. The provided results show that our model exhibits an estimation error for the UE blocking probability below 3.5%.

@INPROCEEDINGS{OscarCellModel2021,
author={O. {Adamuz-Hinojosa} and P. {Ameigeiras} and P. {Munoz} and J. M. {Lopez-Soler} },
booktitle={2021 IEEE Wireless Communications and Networking Conference (WCNC), Nanjing, China},
title={Analytical Model for the UE Blocking Probability in an OFDMA Cell providing GBR Slices},
year={2021},
volume={},
number={},
pages={1-7},
abstract={When a network operator designs strategies for planning and operating Guaranteed Bit Rate (GBR) slices, there are inherent issues such as the under(over)-provisioning of radio resources. To avoid them, modeling the User Equipment (UE) blocking probability in each cell is key. This task is challenging due to the total required bandwidth depends on the channel quality of each UE and the spatio-temporal variations in the number of UE sessions. Under this context, we propose an analytical model to evaluate the UE blocking probability in an Orthogonal Frequency Division Multiple Access (OFDMA) cell. The main novelty of our model is the adoption of a multi-dimensional Erlang-B system which meets the reversibility property. This means our model is insensitive to the holding time distribution for the UE session. In addition, this property reduces the computational complexity of our model due to the solution for the state transition probabilities has product form. The provided results show that our model exhibits an estimation error for the UE blocking probability below 3.5%.},
keywords={Blocking probability; OFDMA; GBR; Erlang-B},
doi={},
ISSN={},
month={Mar.},
project={5gclarity|true5g}
}

"Asynchronous Time-Sensitive Networking for Industrial Networks", Jonathan Prados-Garzon, Lorena Chinchilla-Romero, Pablo Ameigeiras, Pablo Munoz, Juan M. Lopez-Soler, "2021 Joint European Conference on Networks and
Communications   6G Summit (EuCNC/6G Summit)", pp. 130-135, 2021. DOI: 10.1109/EuCNC/6GSummit51104.2021.9482597

@INPROCEEDINGS{9482597,
   author={Prados-Garzon, Jonathan and Chinchilla-Romero, Lorena and Ameigeiras, Pablo and Munoz, Pablo and Lopez-Soler, Juan M.},
   booktitle={2021 Joint European Conference on Networks and
Communications   6G Summit (EuCNC/6G Summit)},
   title={Asynchronous Time-Sensitive Networking for Industrial Networks},
   year={2021},
   volume={},
   number={},
   pages={130-135},
   project={5gclarity|true5g},
   doi={10.1109/EuCNC/6GSummit51104.2021.9482597}}

"WiMuNet's research lines", J. Navarro-Ortiz, N. Chinchilla-Romero, L. Chinchilla-Romero, J. Prados-Garzon, F. Delgado-Ferro, P. Ameigeiras, P. Munoz-Luengo, J. J. Ramos-Munoz, J. M. Lopez-Soler, "VI Workshop on QoE, QoS on Multimedia Communications (QQCM'21)", ISBN 9788409311248, 2021

@Inproceedings{jnavarroqqcm21, author={J. {Navarro-Ortiz} and N. {Chinchilla-Romero} and L. {Chinchilla-Romero} and J. {Prados-Garzon} and F. {Delgado-Ferro} and P. {Ameigeiras} and P. {Munoz-Luengo} and J. J. {Ramos-Munoz} and J. M. {Lopez-Soler}}, booktitle={VI Workshop on QoE, QoS on Multimedia Communications (QQCM'21)}, isbn={9788409311248}, title={WiMuNet's research lines}, year={2021}, url={https://sites.google.com/unizar.es/qqcm-2021/agenda}, project={5gclarity|true5g|artemis}}

"Sharing gNB components in RAN slicing: A perspective from 3GPP/NFV standards", O. Adamuz-Hinojosa, P. Munoz, P. Ameigeiras, J. M. Lopez-Soler, "2019 IEEE Conference on Standards for Communications and Networking (CSCN)", pp. 1-7, 2019. DOI: 10.1109/CSCN.2019.8931318

To implement the next Generation NodeBs (gNBs) that are present in every Radio Access Network (RAN) slice subnet, Network Function Virtualization (NFV) enables the deployment of some of the gNB components as Virtual Networks Functions (VNFs). Deploying individual VNF instances for these components could guarantee the customization of each RAN slice subnet. However, due to the multiplicity of VNFs, the required amount of virtual resources will be greater compared to the case where a single VNF instance carries the aggregated traffic of all the RAN slice subnets. Sharing gNB components between RAN slice subnets could optimize the trade-off between customization, isolation and resource utilization. In this article, we shed light on the key aspects in the Third Generation Partnership Project (3GPP)/NFV standards for sharing gNB components. First, we identify four possible scenarios for sharing gNB components. Then, we analyze the impact of sharing on the customization level of each RAN slice subnet. Later, we determine the main factors that enable isolation between RAN slice subnets. Finally, we propose a 3GPP/NFV-based description model to define the lifecycle management of shared gNB components.

@INPROCEEDINGS{8931318,  author={O. {Adamuz-Hinojosa} and P. {Munoz} and P. {Ameigeiras} and J. M. {Lopez-Soler}},  booktitle={2019 IEEE Conference on Standards for Communications and Networking (CSCN)},   title={Sharing gNB components in RAN slicing: A perspective from 3GPP/NFV standards},   year={2019},  volume={},  number={},  pages={1-7},  abstract={To implement the next Generation NodeBs (gNBs) that are present in every Radio Access Network (RAN) slice subnet, Network Function Virtualization (NFV) enables the deployment of some of the gNB components as Virtual Networks Functions (VNFs). Deploying individual VNF instances for these components could guarantee the customization of each RAN slice subnet. However, due to the multiplicity of VNFs, the required amount of virtual resources will be greater compared to the case where a single VNF instance carries the aggregated traffic of all the RAN slice subnets. Sharing gNB components between RAN slice subnets could optimize the trade-off between customization, isolation and resource utilization. In this article, we shed light on the key aspects in the Third Generation Partnership Project (3GPP)/NFV standards for sharing gNB components. First, we identify four possible scenarios for sharing gNB components. Then, we analyze the impact of sharing on the customization level of each RAN slice subnet. Later, we determine the main factors that enable isolation between RAN slice subnets. Finally, we propose a 3GPP/NFV-based description model to define the lifecycle management of shared gNB components.},  keywords={3GPP;Computer architecture;Ultra reliable low latency communication;Protocols;Next generation networking;Network function virtualization;3GPP;NFV;RAN slicing;sharing gNB components;description model},  doi={10.1109/CSCN.2019.8931318},  ISSN={2644-3252},  month={October}, project={5gcity|artemis}, pdf={https://digibug.ugr.es/handle/10481/68197}
}

"Analytic Analysis of Narrowband IoT Coverage Enhancement Approaches", P. Andres-Maldonado, P. Ameigeiras, J. Prados-Garzon, J. J. Ramos-Munoz, J. Navarro-Ortiz, J. M. Lopez-Soler, "2018 Global Internet of Things Summit (GIoTS)", pp. 1-6, 2018. DOI: 10.1109/GIOTS.2018.8534539

The introduction of Narrowband Internet of Things (NB-IoT) as a cellular (NB-IoT) technology aims to support massive Machine-Type Communications applications. These applications are characterized by massive connections from a large number of low-complexity and low-power devices. One of the goals of NB-IoT is to improve coverage extension beyond existing cellular technologies. In order to do that, NB-IoT introduces transmission repetitions and different bandwidth allocation configurations in uplink. These new transmission approaches yield many transmission options in uplink. In this paper, we propose analytical expressions that describe the influence of these new approaches in the transmission. Our analysis is based on the Shannon theorem. The transmission is studied in terms of the required Signal to Noise Ratio, bandwidth utilization, and energy per transmitted bit. Additionally, we propose an uplink link adaptation algorithm that contemplates these new transmission approaches. The conducted evaluation summarizes the influence of these approaches. Furthermore, we present the resulting uplink link adaptation from our proposed algorithm sweeping the device's coverage.

@INPROCEEDINGS{8534539,  author={P. {Andres-Maldonado} and P. {Ameigeiras} and J. {Prados-Garzon} and J. J. {Ramos-Munoz} and J. {Navarro-Ortiz} and J. M. {Lopez-Soler}},  booktitle={2018 Global Internet of Things Summit (GIoTS)},   title={Analytic Analysis of Narrowband IoT Coverage Enhancement Approaches},   year={2018},  volume={},  number={},  pages={1-6},  abstract={The introduction of Narrowband Internet of Things (NB-IoT) as a cellular (NB-IoT) technology aims to support massive Machine-Type Communications applications. These applications are characterized by massive connections from a large number of low-complexity and low-power devices. One of the goals of NB-IoT is to improve coverage extension beyond existing cellular technologies. In order to do that, NB-IoT introduces transmission repetitions and different bandwidth allocation configurations in uplink. These new transmission approaches yield many transmission options in uplink. In this paper, we propose analytical expressions that describe the influence of these new approaches in the transmission. Our analysis is based on the Shannon theorem. The transmission is studied in terms of the required Signal to Noise Ratio, bandwidth utilization, and energy per transmitted bit. Additionally, we propose an uplink link adaptation algorithm that contemplates these new transmission approaches. The conducted evaluation summarizes the influence of these approaches. Furthermore, we present the resulting uplink link adaptation from our proposed algorithm sweeping the device's coverage.},  keywords={Uplink;Signal to noise ratio;Internet of Things;Long Term Evolution;Narrowband;Data communication;Analytical model;coverage enhancement;link adaptation;nB-IoT},  doi={10.1109/GIOTS.2018.8534539},  ISSN={},  month={June}
}

"An architecture for the 5G control plane based on SDN and data distribution service", A. Llorens-Carrodeguas, C. Cervello-Pastor, I. Leyva-Pupo, J. M. Lopez-Soler, J. Navarro-Ortiz, J. A. Exposito-Arenas, "2018 Fifth International Conference on Software Defined Systems (SDS)", pp. 105-111, 2018. DOI: 10.1109/SDS.2018.8370430

@Inproceedings{8370430,  author={A. {Llorens-Carrodeguas} and C. {Cervello-Pastor} and I. {Leyva-Pupo} and J. M. {Lopez-Soler} and J. {Navarro-Ortiz} and J. A. {Exposito-Arenas}},  booktitle={2018 Fifth International Conference on Software Defined Systems (SDS)},   title={An architecture for the 5G control plane based on SDN and data distribution service},   year={2018},  volume={},  number={},  pages={105-111},  doi={10.1109/SDS.2018.8370430}, project={5gcity}}

"The Roll of Data Distribution Service in Failure-aware SDN Controllers", A. Llorens-Carrodeaguas, C. Cervello-Pastor, I. Leyva-Pupo, J. M. Lopez-Soler, J. Navarro-Ortiz, "XXXIII Simposium Nacional de la Union Cientifica Internacional de Radio (URSI 2018)", 2018

@Inproceedings{allorensursi18,  author={A. {Llorens-Carrodeaguas} and C. {Cervello-Pastor} and I. {Leyva-Pupo} and J. M. {Lopez-Soler} and J. {Navarro-Ortiz}},  booktitle={XXXIII Simposium Nacional de la Union Cientifica Internacional de Radio (URSI 2018)},   title={The Roll of Data Distribution Service in Failure-aware SDN Controllers},   year={2018}, url={http://wpd.ugr.es/~jorgenavarro/publications/preprint_dds_sdn_controllers.pdf}, project={5gcity}, pdf={https://upcommons.upc.edu/handle/2117/126845}}

"WiMuNet's research on 5G and QoE", J. Prados-Garzon, P. Andres-Maldonado, P. Romero-Diaz, J. Navarro-Ortiz, J. J. Ramos-Munoz, P. Ameigeiras, P. Munoz-Luengo, S. Sendra, J. M. Lopez-Soler, "IV Workshop on QoE, QoS on Multimedia Communications (QQCM'18)", 2018

@Inproceedings{jpradosqqcm18,  author={J. {Prados-Garzon} and P. {Andres-Maldonado} and P. {Romero-Diaz} and J. {Navarro-Ortiz} and J. J. {Ramos-Munoz} and P. {Ameigeiras} and P. {Munoz-Luengo} and S. {Sendra} and J. M. {Lopez-Soler}},  booktitle={IV Workshop on QoE, QoS on Multimedia Communications (QQCM'18)}, title={WiMuNet's research on 5G and QoE}, year={2018}, project={5gcity}}

"Analytical modeling for Virtualized Network Functions", J. Prados-Garzon, P. Ameigeiras, J. J. Ramos-Munoz, P. Andres-Maldonado, J. M. Lopez-Soler, "2017 IEEE International Conference on Communications Workshops (ICC Workshops)", pp. 979-985, 2017. DOI: 10.1109/ICCW.2017.7962786

Network Function Virtualization (NFV) is considered one of the key technologies for the 5G mobile networks. In NFV, network functions are implemented in software components denominated Virtual Network Functions (VNFs) running on commodity hardware. In this paper, we propose an analytical model based on an open queuing network of G/G/m queues to model VNFs with several components, and chains of VNFs. Our model is flexible and generic enough to capture the behavior of such systems. We validate our model by simulation. Specifically, we validate it for an LTE virtualized Mobility Management Entity with a three-tiered architecture use case. We also compare our model with the estate of the art, in terms of computational complexity and estimation error. The results show that our model has a computational complexity similar to the method for analyzing Jackson's networks. Additionally, our model exhibits an estimation error, measured as the relative error for the estimation of the mean response time, approximately equal to 10%, whereas for the considered baseline systems it ranges roughly from 60% to 90%.

@INPROCEEDINGS{7962786,  author={J. {Prados-Garzon} and P. {Ameigeiras} and J. J. {Ramos-Munoz} and P. {Andres-Maldonado} and J. M. {Lopez-Soler}},  booktitle={2017 IEEE International Conference on Communications Workshops (ICC Workshops)},   title={Analytical modeling for Virtualized Network Functions},   year={2017},  volume={},  number={},  pages={979-985},  abstract={Network Function Virtualization (NFV) is considered one of the key technologies for the 5G mobile networks. In NFV, network functions are implemented in software components denominated Virtual Network Functions (VNFs) running on commodity hardware. In this paper, we propose an analytical model based on an open queuing network of G/G/m queues to model VNFs with several components, and chains of VNFs. Our model is flexible and generic enough to capture the behavior of such systems. We validate our model by simulation. Specifically, we validate it for an LTE virtualized Mobility Management Entity with a three-tiered architecture use case. We also compare our model with the estate of the art, in terms of computational complexity and estimation error. The results show that our model has a computational complexity similar to the method for analyzing Jackson's networks. Additionally, our model exhibits an estimation error, measured as the relative error for the estimation of the mean response time, approximately equal to 10%, whereas for the considered baseline systems it ranges roughly from 60% to 90%.},  keywords={Computational modeling;Analytical models;Iron;5G mobile communication;Computer architecture;Time factors;Queueing analysis;5G;NFV;VNF;analytical model;queuing model},  doi={10.1109/ICCW.2017.7962786},  ISSN={2474-9133},  month={May}, project={5gcity}
}

"Optimized LTE data transmission procedures for IoT: Device side energy consumption analysis", P. Andres-Maldonado, P. Ameigeiras, J. Prados-Garzon, J. J. Ramos-Munoz, J. M. Lopez-Soler, "2017 IEEE International Conference on Communications Workshops (ICC Workshops)", pp. 540-545, 2017. DOI: 10.1109/ICCW.2017.7962714

The efficient deployment of Internet of Things (IoT) over cellular networks, such as Long Term Evolution (LTE) or the next generation 5G, entails several challenges. For massive IoT, reducing the energy consumption on the device side becomes essential. One of the main characteristics of massive IoT is small data transmissions. To improve the support of them, the 3GPP has included two novel optimizations in LTE: one of them based on the Control Plane (CP), and the other on the User Plane (UP). In this paper, we analyze the average energy consumption per data packet using these two optimizations compared to conventional LTE Service Request procedure. We propose an analytical model to calculate the energy consumption for each procedure based on a Markov chain. In the considered scenario, for large and small Inter-Arrival Times (IATs), the results of the three procedures are similar. While for medium IATs CP reduces the energy consumption per packet up to 87% due to its connection release optimization.

@INPROCEEDINGS{7962714,  author={P. {Andres-Maldonado} and P. {Ameigeiras} and J. {Prados-Garzon} and J. J. {Ramos-Munoz} and J. M. {Lopez-Soler}},  booktitle={2017 IEEE International Conference on Communications Workshops (ICC Workshops)},   title={Optimized LTE data transmission procedures for IoT: Device side energy consumption analysis},   year={2017},  volume={},  number={},  pages={540-545},  abstract={The efficient deployment of Internet of Things (IoT) over cellular networks, such as Long Term Evolution (LTE) or the next generation 5G, entails several challenges. For massive IoT, reducing the energy consumption on the device side becomes essential. One of the main characteristics of massive IoT is small data transmissions. To improve the support of them, the 3GPP has included two novel optimizations in LTE: one of them based on the Control Plane (CP), and the other on the User Plane (UP). In this paper, we analyze the average energy consumption per data packet using these two optimizations compared to conventional LTE Service Request procedure. We propose an analytical model to calculate the energy consumption for each procedure based on a Markov chain. In the considered scenario, for large and small Inter-Arrival Times (IATs), the results of the three procedures are similar. While for medium IATs CP reduces the energy consumption per packet up to 87% due to its connection release optimization.},  keywords={Long Term Evolution;Energy consumption;Optimization;Data communication;3GPP;Context;Security},  doi={10.1109/ICCW.2017.7962714},  ISSN={2474-9133},  month={May}, project={5gcity}, pdf={https://digibug.ugr.es/handle/10481/68238}
}

"Servicio centralizado de proyeccion de material docente", Jorge Navarro-Ortiz, Sandra Sendra, Pablo Ameigeiras, Angel de la Torre, Luz Garcia, Angel M. Gomez, Juan Manuel Lopez-Soler, Sonia Mota, Pablo Padilla, Jonathan Prados-Garzon, Javier Ramirez, Juan Jose Ramos-Munoz, Antonio Ruiz-Moya, Jose Carlos Segura, "V Jornadas de Innovacion Educativa at XIII Jornadas de Ingenieria Telematica (JITEL 2017)", 2017

@INPROCEEDINGS{jnavarrojitel17,  author={Navarro-Ortiz, Jorge and Sendra, Sandra and Ameigeiras, Pablo and de la Torre, Angel and Garcia, Luz and Gomez, Angel M. and Lopez-Soler, Juan Manuel and Mota, Sonia and Padilla, Pablo and Prados-Garzon, Jonathan and Ramirez, Javier and Ramos-Munoz, Juan Jose and Ruiz-Moya, Antonio and Segura, Jose Carlos},  booktitle={V Jornadas de Innovacion Educativa at XIII Jornadas de Ingenieria Telematica (JITEL 2017)}, title={Servicio centralizado de proyeccion de material docente},   year={2017}, url={http://wpd.ugr.es/~jorgenavarro/publications/52-6508.pdf}}

"Handover implementation in a 5G SDN-based mobile network architecture", J. Prados-Garzon, O. Adamuz-Hinojosa, P. Ameigeiras, J. J. Ramos-Munoz, P. Andres-Maldonado, J. M. Lopez-Soler, "2016 IEEE 27th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)", pp. 1-6, 2016. DOI: 10.1109/PIMRC.2016.7794936

Requirements for 5G mobile networks includes a higher flexibility, scalability, cost effectiveness and energy efficiency. Towards these goals, Software Defined Networking (SDN) and Network Functions Virtualization have been adopted in recent proposals for future mobile networks architectures because they are considered critical technologies for 5G. In this paper, we propose an X2-based handover implementation in an SDN-based and partially virtualized LTE architecture. Moreover, the architecture considered operates at link level, which provides lower latency and higher scalability. In our implementation, we use MPLS tunnels for user plane instead of GTP-U protocol, which introduces a significant overhead. To verify the correct operation of our system, we developed a simulator. It implements the messages exchange and processing of the primary network entities. Using this tool we measured the handover preparation and completion times, whose estimated values were roughly 6.94 ms and 8.31 ms, respectively, according to our experimental setup. These latencies meet the expected requirements concerning control plane delay budgets for 5G networks.

@INPROCEEDINGS{7794936,  author={J. {Prados-Garzon} and O. {Adamuz-Hinojosa} and P. {Ameigeiras} and J. J. {Ramos-Munoz} and P. {Andres-Maldonado} and J. M. {Lopez-Soler}},  booktitle={2016 IEEE 27th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)},   title={Handover implementation in a 5G SDN-based mobile network architecture},   year={2016},  volume={},  number={},  pages={1-6},  abstract={Requirements for 5G mobile networks includes a higher flexibility, scalability, cost effectiveness and energy efficiency. Towards these goals, Software Defined Networking (SDN) and Network Functions Virtualization have been adopted in recent proposals for future mobile networks architectures because they are considered critical technologies for 5G. In this paper, we propose an X2-based handover implementation in an SDN-based and partially virtualized LTE architecture. Moreover, the architecture considered operates at link level, which provides lower latency and higher scalability. In our implementation, we use MPLS tunnels for user plane instead of GTP-U protocol, which introduces a significant overhead. To verify the correct operation of our system, we developed a simulator. It implements the messages exchange and processing of the primary network entities. Using this tool we measured the handover preparation and completion times, whose estimated values were roughly 6.94 ms and 8.31 ms, respectively, according to our experimental setup. These latencies meet the expected requirements concerning control plane delay budgets for 5G networks.},  keywords={Long Term Evolution;Handover;Mobile computing;5G mobile communication;Computer architecture;Handover;5G;SDN;NFV;virtualized LTE/EPC},  doi={10.1109/PIMRC.2016.7794936},  ISSN={2166-9589},  month={September}
}

"MME Support for M2M Communications Using Network Function Virtualization", Pilar Andres-Maldonado, Pablo Ameigeiras, Jonathan Prados, Juan J. Ramos-Munoz, Juan M. Lopez-Soler, "The Twelfth Advanced International Conference on Telecommunications. AICT 2016. Valencia, Spain", ISBN 2308-4030/978-1-61208-473-2, 2016

@inproceedings{lopezsoler2016,
author = {Andres-Maldonado, Pilar and Ameigeiras, Pablo and Prados, Jonathan and Ramos-Munoz, Juan J. and Lopez-Soler, Juan M.},
booktitle = {The Twelfth Advanced International Conference on Telecommunications. AICT 2016. Valencia, Spain},
year = {2016},
month = {May},
isbn = {2308-4030/978-1-61208-473-2},
title = {MME Support for M2M Communications Using Network Function Virtualization},
project =" AGINET",
url = {https://www.researchgate.net/publication/305491037_MME_Support_for_M2M_Communications_Using_Network_Function_Virtualization}
}

"Reduced M2M signaling communications in 3GPP LTE and future 5G cellular networks", P. Andres-Maldonado, P. Ameigeiras, J. Prados-Garzon, J. J. Ramos-Munoz, J. M. Lopez-Soler, "2016 Wireless Days (WD)", pp. 1-3, 2016. DOI: 10.1109/WD.2016.7461499

The increase of machine-to-machine (M2M) communications over cellular networks imposes new requirements and challenges that current networks have to handle with. Many M2M UEs (User Equipment) may send small infrequent data, which suppose a challenge for cellular networks not optimized for such traffic, where signaling load could increase significantly and cause congestion over the network. This paper evaluates current proposals to manage small transmissions over the Long Term Evolution (LTE) cellular network. We also propose a new Random Access-based Small IP packet Transmission (RASIPT) procedure for M2M UEs small data transmissions. Its main feature is data transfer without establishment of Radio Resource Control (RRC) connection to reduce signaling overhead. In our design, we assume a Software Defined Networking-based architecture for 5G system. When compared with current LTE scheme, our procedure reduces significantly the signaling load generated by M2M UEs small transmissions.

@INPROCEEDINGS{7461499,  author={P. {Andres-Maldonado} and P. {Ameigeiras} and J. {Prados-Garzon} and J. J. {Ramos-Munoz} and J. M. {Lopez-Soler}},  booktitle={2016 Wireless Days (WD)},   title={Reduced M2M signaling communications in 3GPP LTE and future 5G cellular networks},   year={2016},  volume={},  number={},  pages={1-3},  abstract={The increase of machine-to-machine (M2M) communications over cellular networks imposes new requirements and challenges that current networks have to handle with. Many M2M UEs (User Equipment) may send small infrequent data, which suppose a challenge for cellular networks not optimized for such traffic, where signaling load could increase significantly and cause congestion over the network. This paper evaluates current proposals to manage small transmissions over the Long Term Evolution (LTE) cellular network. We also propose a new Random Access-based Small IP packet Transmission (RASIPT) procedure for M2M UEs small data transmissions. Its main feature is data transfer without establishment of Radio Resource Control (RRC) connection to reduce signaling overhead. In our design, we assume a Software Defined Networking-based architecture for 5G system. When compared with current LTE scheme, our procedure reduces significantly the signaling load generated by M2M UEs small transmissions.},  keywords={5G mobile communication;Data communication;3GPP;Uplink;Wireless communication;Long Term Evolution;Context;machine to machine;small data transmission;SDT;SDN},  doi={10.1109/WD.2016.7461499},  ISSN={},  month={March}
}

"Latency evaluation of a virtualized MME", J. Prados-Garzon, J. J. Ramos-Munoz, P. Ameigeiras, P. Andres-Maldonado, J. M. Lopez-Soler, "2016 Wireless Days (WD)", pp. 1-3, 2016. DOI: 10.1109/WD.2016.7461500

Network Virtualization is one of the key technologies for developing the future mobile networks. In this paper we propose an LTE virtualized Mobility Management Entity queue model to evaluate its service time for a given signaling workload. Additionally, we provide a compound data traffic model for the future mobile applications, and we predict theoretically the control workload that it will generate. Finally, we evaluate the virtualized Mobility Management Entity overall mean delay by simulation, providing insights for selecting the number of processing instances for a given number of users.

@INPROCEEDINGS{7461500,  author={J. {Prados-Garzon} and J. J. {Ramos-Munoz} and P. {Ameigeiras} and P. {Andres-Maldonado} and J. M. {Lopez-Soler}},  booktitle={2016 Wireless Days (WD)},   title={Latency evaluation of a virtualized MME},   year={2016},  volume={},  number={},  pages={1-3},  abstract={Network Virtualization is one of the key technologies for developing the future mobile networks. In this paper we propose an LTE virtualized Mobility Management Entity queue model to evaluate its service time for a given signaling workload. Additionally, we provide a compound data traffic model for the future mobile applications, and we predict theoretically the control workload that it will generate. Finally, we evaluate the virtualized Mobility Management Entity overall mean delay by simulation, providing insights for selecting the number of processing instances for a given number of users.},  keywords={Delays;Process control;Computational modeling;Cloud computing;Mathematical model;Iron;Wireless communication;virtualized MME;queue model;NFV;LTE},  doi={10.1109/WD.2016.7461500},  ISSN={},  month={March}
}

"Wireless and Multimedia Networking laboratory", J. Prados-Garzon, P. Andres-Maldonado, P. Romero-Diaz, J. Navarro-Ortiz, J. J. Ramos-Munoz, P. Ameigeiras, P. Munoz-Luengo, S. Sendra, J. M. Lopez-Soler, "II Workshop on QoE, QoS on Multimedia Communications (QQCM'16)", 2016

@Inproceedings{jpradosqqcm16,  author={J. {Prados-Garzon} and P. {Andres-Maldonado} and P. {Romero-Diaz} and J. {Navarro-Ortiz} and J. J. {Ramos-Munoz} and P. {Ameigeiras} and P. {Munoz-Luengo} and S. {Sendra} and J. M. {Lopez-Soler}},  booktitle={II Workshop on QoE, QoS on Multimedia Communications (QQCM'16)}, title={Wireless and Multimedia Networking laboratory},   year={2016}}

"Wireless and Multimedia Networking (WiMuNet) laboratory", J. Navarro-Ortiz, P. Ameigeiras, J. J. Ramos-Munoz, J. Prados-Garzon, J. M. Lopez-Soler, "XII Jornadas de Ingenieria Telematica (JITEL 2015)", 2015

@Inproceedings{jnavarrojitel15,  author={J. {Navarro-Ortiz} and P. {Ameigeiras} and J. J. {Ramos-Munoz} and J. {Prados-Garzon} and J. M. {Lopez-Soler}},  booktitle={XII Jornadas de Ingenieria Telematica (JITEL 2015)}, title={Wireless and Multimedia Networking (WiMuNet) laboratory},   year={2015}, url={http://wpd.ugr.es/~jorgenavarro/publications/jitel15_wimunet.pdf}}

"Diseno de una arquitectura para la red de acceso para 5G basada en SDN", P. Ameigeiras, J. J. Ramos-Munoz, L. Schumacher, J. Prados-Garzon, J. Navarro-Ortiz, J. M. Lopez-Soler, "XII Jornadas de Ingenieria Telematica (JITEL 2015)", 2015

@Inproceedings{pameigeirasjitel15,  author={P. {Ameigeiras} and J. J. {Ramos-Munoz} and L. {Schumacher} and J. {Prados-Garzon} and J. {Navarro-Ortiz} and J. M. {Lopez-Soler}},  booktitle={XII Jornadas de Ingenieria Telematica (JITEL 2015)}, title={Diseno de una arquitectura para la red de acceso para 5G basada en SDN},   year={2015}, url={http://wpd.ugr.es/~jorgenavarro/publications/jitel15_arquitectura5g.pdf}}

"NAPA: An algorithm to auto-tune unicast reliable communications over DDS", Juan J. Martin-Carrascosa, Jose M- Lopez-Vega, Javier Povedano-Molina, and Juan J. Ramos-Munoz, Juan M. Lopez-Soler, "XI Jornadas de Ingenieria Telematica (JITEL 2013). Granada, Spain.
", ISBN 978-84-616-5597-7, 2013

@Inproceedings{lopezsoler2013,
	title = {NAPA: An algorithm to auto-tune unicast reliable communications over DDS},
	booktitle={XI Jornadas de Ingenieria Telematica (JITEL 2013). Granada, Spain.
},
	isbn = {978-84-616-5597-7},
	author = {Juan J. Martin-Carrascosa and Jose M- Lopez-Vega and Javier Povedano-Molina and and Juan J. Ramos-Munoz and Juan M. Lopez-Soler},
	month = October,
	year = {2013},
	url = {http://dtstc.ugr.es/jitel2013/},
	project = ""
}

"YouTube traffic detection and characteristics extraction", J. Navarro-Ortiz, P. Ameigeiras, J. J. Ramos-Munoz, J. Prados-Garzon, J. M. Lopez-Soler, "XI Jornadas de Ingenieria Telematica (JITEL 2013)", 2013

@Inproceedings{jnavarrojitel13,  author={J. {Navarro-Ortiz} and P. {Ameigeiras} and J. J. {Ramos-Munoz} and J. {Prados-Garzon} and J. M. {Lopez-Soler}},  booktitle={XI Jornadas de Ingenieria Telematica (JITEL 2013)}, title={YouTube traffic detection and characteristics extraction},   year={2013}, url={http://wpd.ugr.es/~jorgenavarro/publications/jitel13_youtubedetection.pdf}}

"Simulation-based performance study of YouTube service in 3G LTE", J. Prados-Garzon, P. Ameigeiras, J. Navarro-Ortiz, J. M. Lopez-Soler, "2013 IEEE 14th International Symposium on "A World of Wireless, Mobile and Multimedia Networks" (WoWMoM)", pp. 1-3, 2013. DOI: 10.1109/WoWMoM.2013.6583422

@Inproceedings{6583422,  author={J. {Prados-Garzon} and P. {Ameigeiras} and J. {Navarro-Ortiz} and J. M. {Lopez-Soler}},  booktitle={2013 IEEE 14th International Symposium on "A World of Wireless, Mobile and Multimedia Networks" (WoWMoM)},   title={Simulation-based performance study of YouTube service in 3G LTE},   year={2013},  volume={},  number={},  pages={1-3},  doi={10.1109/WoWMoM.2013.6583422}}

"DDS-enabled Cloud management support for fast task offloading", A. Corradi, L. Foschini, J. Povedano-Molina, J. M. Lopez-Soler, "2012 IEEE Symposium on Computers and Communications (ISCC)", pp. 000067-000074, 2012. DOI: 10.1109/ISCC.2012.6249270

Cloud computing has become an essential technology not only for web provisioning, but also in mobile scenarios. Mobile devices are usually resource constrained due to processing and power limitations, so typical applications are not easy portable. Battery draining and application performance (resource shortage) have a big impact on the experienced quality, so shifting applications and services to the Cloud may improve mobile user's satisfaction. However, available Cloud solutions are mostly focused on scenarios with slowly changing provisioning, which are unable to support and promptly react to short-term provisioning requests. To address the new scenario, this paper proposes a novel Cloud monitoring and management architecture based on the data-centric publish-subscribe Data Distribution Service (DDS) standard. We present not only an architecture proposal, but also a real prototype that we have deployed in our experimental testbed. The experimental results show that our architecture is able to support the scheduling of highly dynamic tasks in the Cloud while maintaining low overheads.

@INPROCEEDINGS{6249270,  author={A. {Corradi} and L. {Foschini} and J. {Povedano-Molina} and J. M. {Lopez-Soler}},  booktitle={2012 IEEE Symposium on Computers and Communications (ISCC)},   title={DDS-enabled Cloud management support for fast task offloading},   year={2012},  volume={},  number={},  pages={000067-000074},  abstract={Cloud computing has become an essential technology not only for web provisioning, but also in mobile scenarios. Mobile devices are usually resource constrained due to processing and power limitations, so typical applications are not easy portable. Battery draining and application performance (resource shortage) have a big impact on the experienced quality, so shifting applications and services to the Cloud may improve mobile user's satisfaction. However, available Cloud solutions are mostly focused on scenarios with slowly changing provisioning, which are unable to support and promptly react to short-term provisioning requests. To address the new scenario, this paper proposes a novel Cloud monitoring and management architecture based on the data-centric publish-subscribe Data Distribution Service (DDS) standard. We present not only an architecture proposal, but also a real prototype that we have deployed in our experimental testbed. The experimental results show that our architecture is able to support the scheduling of highly dynamic tasks in the Cloud while maintaining low overheads.},  keywords={Monitoring;Peer to peer computing;Computer architecture;Publish-subscribe;Proposals;Data models;Servers;Cloud monitoring;Cloud management;OpenStack;publish-subscribe;data-centric;DDS},  doi={10.1109/ISCC.2012.6249270},  ISSN={1530-1346},  month={July}}

"Objetive and Perceptual Impact of TCP Dropping Policies on VoIP Flows", Erika Patricia Alvarez-Flores, Juan Jose Ramos-Munoz, Jose M. Lopez-Vega, Juan Manuel Lopez-Soler, "The Fourth International Conferences on Advanced Service Computing (SERVICE COMPUTATION 2012). Nice, France.
", ISBN 2308-3549 / 978-1-61208-215-8, 2012

@Inproceedings{lopezsoler2012,
	title = {Objetive and Perceptual Impact of TCP Dropping Policies on VoIP Flows},
	booktitle={The Fourth International Conferences on Advanced Service Computing (SERVICE COMPUTATION 2012). Nice, France.
},
	isbn = {2308-3549 / 978-1-61208-215-8},
	author = {Erika Patricia Alvarez-Flores and Juan Jose Ramos-Munoz and Jose M. Lopez-Vega and Juan Manuel Lopez-Soler},
	month = July,
	year = {2012},
	url = {http://www.thinkmind.org/index.php?view=article&articleid=service_computation_2012_4_30_10094},
	project = ""
}

"Video Tester: A multiple-metric framework for video quality assessment over IP networks", I. Ucar, J. Navarro-Ortiz, P. Ameigeiras, J. M. Lopez-Soler, "IEEE international Symposium on Broadband Multimedia Systems and Broadcasting", pp. 1-5, 2012. DOI: 10.1109/BMSB.2012.6264243

@Inproceedings{6264243,  author={I. {Ucar} and J. {Navarro-Ortiz} and P. {Ameigeiras} and J. M. {Lopez-Soler}},  booktitle={IEEE international Symposium on Broadband Multimedia Systems and Broadcasting},   title={Video Tester: A multiple-metric framework for video quality assessment over IP networks},   year={2012},  volume={},  number={},  pages={1-5},  doi={10.1109/BMSB.2012.6264243}}

"Algoritmo de Seleccion para Descarte en Esquemas AQM para un Doble Servicio Equitativo", Erika Patricia Alvarez-Flores, Juan Jose Ramos-Munoz, Lorenia Cantu Ballesteros, Juan Manuel Lopez-Soler, "11 Congreso Nacional de Ingenieria Electrica y Electronica (CONIEEM 2011)
Yucatan, Mexico", 2011

@Inproceedings{lopezsoler2011b,
	title = {Algoritmo de Seleccion para Descarte en Esquemas AQM para un Doble Servicio Equitativo},
	booktitle={11 Congreso Nacional de Ingenieria Electrica y Electronica (CONIEEM 2011)
Yucatan, Mexico},
	author = {Erika Patricia Alvarez-Flores and Juan Jose Ramos-Munoz and Lorenia Cantu Ballesteros and Juan Manuel Lopez-Soler},
	month = September,
	year = {2011},
	url = {http://www.cesues.edu.mx/PDFS/investigacion_y_desarrollo/CONVOCATORIA_CONIEEM_2011.pdf},
	pages = {},
	project = ""
}

" An extensible DDS-based monitoring and intrusion detection system", Fernando Garcia Aranda, Javier Sanchez-Monedero, Juan M. Lopez-Soler, "Workshop on Real-time, Embedded and Enterprise-Scale Time-Critical Systems. Arlington, VA USA", 2011

@Inproceedings{lopezsoler2011a,
	title = { An extensible DDS-based monitoring and intrusion detection system},
	booktitle={Workshop on Real-time, Embedded and Enterprise-Scale Time-Critical Systems. Arlington, VA USA},
	author = {Fernando Garcia Aranda and Javier Sanchez-Monedero and Juan M. Lopez-Soler},
	month = March,
	year = {2011},
	project = ""
}

"DDS/SIP Interworking: A DDS-SIP Gateway", Jose M. Lopez-Vega, Javier Povedano-Molina, Juan M. Lopez-Soler, "Workshop on Real-time, Embedded and Enterprise-Scale Time-Critical Systems. Arlington, VA USA", 2010

@Inproceedings{lopezsoler2010c,
	title = {DDS/SIP Interworking: A DDS-SIP Gateway},
	booktitle={Workshop on Real-time, Embedded and Enterprise-Scale Time-Critical Systems. Arlington, VA USA},
	author = {Jose M. Lopez-Vega and Javier Povedano-Molina and Juan M. Lopez-Soler},
	month = May,
	year = {2010},
	project = ""
}

" EMDS: an Extensible Multimedia Distribution Service ", Javier Povedano-Molina, Jose M. Lopez-Vega, Juan M. Lopez-Soler, "Workshop on Real-time, Embedded and Enterprise-Scale Time-Critical Systems. Arlington, VA USA", 2010

@Inproceedings{lopezsoler2010d,
	title = { EMDS: an Extensible Multimedia Distribution Service },
	booktitle={Workshop on Real-time, Embedded and Enterprise-Scale Time-Critical Systems. Arlington, VA USA},
	author = {Javier Povedano-Molina and Jose M. Lopez-Vega and Juan M. Lopez-Soler},
	month = May,
	year = {2010},
	project = ""
}

"Quality of experience based resource sharing in IEEE 802.11e HCCA", J. Navarro-Ortiz, J. M. Lopez-Soler, G. Stea, "2010 European Wireless Conference (EW)", pp. 454-461, 2010. DOI: 10.1109/EW.2010.5483493

When dealing with multiple traffic classes, it is often difficult to define a single resource sharing criterion. For instance, VoIP flows require low delay and losses, whereas FTP traffic requires high throughput. In this paper, we propose to use the Mean Opinion Score (MOS) as a unifying criterion, and to share resources so as to keep the MOS of the various flows above an acceptable threshold whenever possible. We present four different resource sharing policies: Preemptive, Non-preemptive, MOS-driven Fairness and Revenue Optimization. We analyze the different approaches through simulation, comparing their performance in terms of end-user Quality of Experience and revenue. Our results show that our scheme reacts to the changing traffic scenarios so as to achieve the pre-specified objective, thus achieving an effective exploitation of the limited bandwidth resources.

@INPROCEEDINGS{5483493,  author={J. {Navarro-Ortiz} and J. M. {Lopez-Soler} and G. {Stea}},  booktitle={2010 European Wireless Conference (EW)},   title={Quality of experience based resource sharing in IEEE 802.11e HCCA},   year={2010},  volume={},  number={},  pages={454-461},  abstract={When dealing with multiple traffic classes, it is often difficult to define a single resource sharing criterion. For instance, VoIP flows require low delay and losses, whereas FTP traffic requires high throughput. In this paper, we propose to use the Mean Opinion Score (MOS) as a unifying criterion, and to share resources so as to keep the MOS of the various flows above an acceptable threshold whenever possible. We present four different resource sharing policies: Preemptive, Non-preemptive, MOS-driven Fairness and Revenue Optimization. We analyze the different approaches through simulation, comparing their performance in terms of end-user Quality of Experience and revenue. Our results show that our scheme reacts to the changing traffic scenarios so as to achieve the pre-specified objective, thus achieving an effective exploitation of the limited bandwidth resources.},  keywords={Resource management;Bandwidth;Traffic control;Telecommunication traffic;Scheduling algorithm;Measurement;Delay;Throughput;Protocols;3G mobile communication;802.11e;HCCA;Quality of Experience;Scheduling;Resource allocation policies},  doi={10.1109/EW.2010.5483493},  ISSN={},  month={April}}

"Politicas de QoS en una Plataforma de Trabajo Colaborativo sobre Middleware DDS", Jose M. Lopez-Vega, Javier Povedano Molina, Javier Sanchez-Monedero, Juan M. Lopez-Soler, "XIII Jornadas de Tiempo Real JTR2010. Granada, Spain", ISBN 978-84-92757-51-0, pp. 143-154, 2010

@Inproceedings{lopezsoler2010a,
	title = {Politicas de QoS en una Plataforma de Trabajo Colaborativo sobre Middleware DDS},
	booktitle={XIII Jornadas de Tiempo Real JTR2010. Granada, Spain},
	isbn = {978-84-92757-51-0},
	author = {Jose M. Lopez-Vega and Javier Povedano Molina and Javier Sanchez-Monedero and Juan M. Lopez-Soler},
	month = February,
	year = {2010},
	pages = {143-154},
	project = ""
}

" Instant Messaging Based Interface for Data Distribution Service", Javier Povedano Molina, Jose M. Lopez-Vega, Javier Sanchez-Monedero, Juan M. Lopez-Soler, "XIII Jornadas de Tiempo Real JTR2010. Granada, Spain", ISBN 978-84-92757-51-0, pp. 223-330, 2010

@Inproceedings{lopezsoler2010b,
	title = { Instant Messaging Based Interface for Data Distribution Service},
	booktitle={XIII Jornadas de Tiempo Real JTR2010. Granada, Spain},
	isbn = {978-84-92757-51-0},
	author = {Javier Povedano Molina and Jose M. Lopez-Vega and Javier Sanchez-Monedero and Juan M. Lopez-Soler},
	month = February,
	year = {2010},
	pages = {223-330},
	project = ""
}

"QoE Evaluation of Scheduling Algorithms for NRT Services in LTE", Pablo Ameigeiras, Juan J. Ramos-Munoz, Jorge Navarro-Ortiz, Juan Ramiro-Moreno, Juan Manuel Lopez-Soler, "ICT-MobileSummit 2009. Santander, Spain", ISBN 978-1-905824-12-0, 2009

@Inproceedings{lopezsoler2009,
	title = {QoE Evaluation of Scheduling Algorithms for NRT Services in LTE},
	booktitle={ICT-MobileSummit 2009. Santander, Spain},
	url = {http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.453.4750},
	author = {Pablo Ameigeiras and Juan J. Ramos-Munoz and Jorge Navarro-Ortiz and Juan Ramiro-Moreno and Juan Manuel Lopez-Soler},
	month = June,
	year = {2009},
	isbn={978-1-905824-12-0},
	project = ""
}

"An XML-based Approach to the Configuration and Deployment of DDS Applications", Javier Sanchez Monedero, Jose M. Lopez-Vega, Javier Povedano Molina, Juan M. Lopez-Soler, "Workshop on Distributed Object Computing for Real-Time and Embedded Systems. Arlington, VA USA", 2008

@Inproceedings{lopezsoler2008a,
author = {Javier Sanchez Monedero and Jose M. Lopez-Vega and Javier Povedano Molina and Juan M. Lopez-Soler},
year = {2008},
month = {July},
pages = {},
title = {An XML-based Approach to the Configuration and Deployment of DDS Applications},
url = {https://www.researchgate.net/profile/Javier-Sanchez-Monedero/publication/265172586_An_XML-Based_Approach_to_the_Configuration_and_Deployment_of_DDS_Applications/links/5551dade08ae739bdb92611d/An-XML-Based-Approach-to-the-Configuration-and-Deployment-of-DDS-Applications.pdf},
	booktitle={Workshop on Distributed Object Computing for Real-Time and Embedded Systems. Arlington, VA USA}
}

"QoS Policies for Audio/Video Distribution over DDS Middleware", Jose M. Lopez-Vega, Javier Sanchez Monedero, Javier Povedano Molina, Juan M. Lopez-Soler, "Workshop on Distributed Object Computing for Real-Time and Embedded Systems. Arlington, VA USA", 2008

@Inproceedings{lopezsoler2008b,
author = {Jose M. Lopez-Vega and Javier Sanchez Monedero and Javier Povedano Molina and Juan M. Lopez-Soler},
year = {2008},
month = {July},
title = {QoS Policies for Audio/Video Distribution over DDS Middleware},
url = {https://www.researchgate.net/publication/265172718_QoS_Policies_for_AudioVideo_Distribution_Over_DDS_Middleware},
	booktitle={Workshop on Distributed Object Computing for Real-Time and Embedded Systems. Arlington, VA USA}
}

"Scalable DDS Discovery Protocols Based on Bloom Filters", Javier Sanchez-Monedero, Javier Povedano-Molina, Lopez-Soler Juan M., "Workshop on Distributed Object Computing for Real-Time and Embedded Systems. Arlington, VA USA", 2007

@Inproceedings{lopezSoler2007c,
author = {Sanchez-Monedero, Javier and Povedano-Molina, Javier and Lopez-Soler Juan M.},
year = {2007},
month = {July},
pages = {},
title = {Scalable DDS Discovery Protocols Based on Bloom Filters},
url = {https://www.researchgate.net/publication/237532369_Scalable_DDS_Discovery_Protocols_Based_on_Bloom_Filters},
	booktitle={Workshop on Distributed Object Computing for Real-Time and Embedded Systems. Arlington, VA USA}
}

"Fuzzy-Genetic Methodology for Web-Based Computed Aided Diagnosis in Medical Applications", Francisco Jesus De Toro Negro, Javier Aroba Paez, Juan M. Lopez-Soler, "Computational Intelligence, Theory and Applications. Springer, Berlin, Heidelberg", ISBN 978-3-540-34780-4, pp. 201-213, 2006. DOI: https://doi.org/10.1007/3-540-34783-6_21

@Inproceedings{lopezsoler2006,
	title = {Fuzzy-Genetic Methodology for Web-Based Computed Aided Diagnosis in Medical Applications},
	booktitle={Computational Intelligence, Theory and Applications. Springer, Berlin, Heidelberg},
	isbn = {978-3-540-34780-4},
	url = {https://link.springer.com/chapter/10.1007/3-540-34783-6_21},
	author = {Francisco Jesus De Toro Negro and Javier Aroba Paez and Juan M. Lopez-Soler},
	year = {2006},
	pages = {201-213},
	project = "",
	doi = {https://doi.org/10.1007/3-540-34783-6_21}
}

"BOOTES-IR: a robotic nIR astronomical observatory devoted to follow-up of transient phenomena", A. J. Castro-Tirado, R. Cunniffe, A. de Ugarte Postigo, M. Jelinek, S. Vitek, P. Kubanek, J. Gorosabel, S. Castillo Carrion, T. J. Mateo Sanguino, A. Riva, P. Conconi, V. di Caprio, F. Zerbi, P. Amado, C. Cardenas, A. Claret, S. Guziy, S. Martin-Ruiz, M. A. Sanchez, P. Garcia Teodoro, J. M. Castro Ceron, J. Diaz Verdejo, R. Hudec, J. M. Lopez-Soler, J. A. Berna Galiano, J. Casares, J. Fabregat, P. Pata, C. Sanchez Fernandez, M. D. Sabau-Graziati, J. M. Trigo-Rodriguez, F. Vitali, "Ground-based and Airborne Telescopes", pp. 170-179, 2006. DOI: 10.1117/12.671579

"BOOTES-IR" is the extension of the BOOTES experiment, which has been operating in Southern Spain since
1998, to the near-infrared (nIR). The goal is to follow up the early stage of the gamma ray burst (GRB)
afterglow emission in the nIR, as BOOTES does already at optical wavelengths. The scientific case that drives
the BOOTES-IR performance is the study of GRBs with the support of spacecraft like HETE-2, INTEGRAL and
SWIFT (and GLAST in the future). Given that the afterglow emission in both, the nIR and the optical, in the
instances immediately following a GRB, is extremely bright (reached V = 8.9 in one case), it should be possible
to detect this prompt emission at nIR wavelengths too. Combined observations by BOOTES-IR and BOOTES-1
and BOOTES-2 since 2006 can allow for real time identification of trustworthy candidates to have a ultra-high
redshift (z > 6). It is expected that, few minutes after a GRB, the nIR magnitudes be H ~ 10-15, hence very
high quality spectra can be obtained for objects as far as z = 10 by much larger ground-based telescopes. A
significant fraction of observing time will be available for other scientific projects of interest, objects relatively
bright and variable, like Solar System objects, brown dwarfs, variable stars, planetary nebulae, compact objects
in binary systems and blazars.

@inproceedings{castro06,
author = {A. J. Castro-Tirado and R. Cunniffe and A. de Ugarte Postigo and M. Jelinek and S. Vitek and P. Kubanek and J. Gorosabel and S. Castillo Carrion and T. J. Mateo Sanguino and A. Riva and P. Conconi and V. di Caprio and F. Zerbi and P. Amado and C. Cardenas and A. Claret and S. Guziy and S. Martin-Ruiz and M. A. Sanchez and P. Garcia Teodoro and J. M. Castro Ceron and J. Diaz Verdejo and R. Hudec and J. M. Lopez-Soler and J. A. Berna Galiano and J. Casares and J. Fabregat and P. Pata and C. Sanchez Fernandez and M. D. Sabau-Graziati and J. M. Trigo-Rodriguez and F. Vitali},
title = {{BOOTES-IR: a robotic nIR astronomical observatory devoted to follow-up of transient phenomena}},
volume = {6267},
booktitle = {Ground-based and Airborne Telescopes},
editor = {Larry M. Stepp},
organization = {International Society for Optics and Photonics},
publisher = {SPIE},
pages = {170-179},
abstract = {"BOOTES-IR" is the extension of the BOOTES experiment, which has been operating in Southern Spain since
1998, to the near-infrared (nIR). The goal is to follow up the early stage of the gamma ray burst (GRB)
afterglow emission in the nIR, as BOOTES does already at optical wavelengths. The scientific case that drives
the BOOTES-IR performance is the study of GRBs with the support of spacecraft like HETE-2, INTEGRAL and
SWIFT (and GLAST in the future). Given that the afterglow emission in both, the nIR and the optical, in the
instances immediately following a GRB, is extremely bright (reached V = 8.9 in one case), it should be possible
to detect this prompt emission at nIR wavelengths too. Combined observations by BOOTES-IR and BOOTES-1
and BOOTES-2 since 2006 can allow for real time identification of trustworthy candidates to have a ultra-high
redshift (z > 6). It is expected that, few minutes after a GRB, the nIR magnitudes be H ~ 10-15, hence very
high quality spectra can be obtained for objects as far as z = 10 by much larger ground-based telescopes. A
significant fraction of observing time will be available for other scientific projects of interest, objects relatively
bright and variable, like Solar System objects, brown dwarfs, variable stars, planetary nebulae, compact objects
in binary systems and blazars.},
keywords = {Robotic telescopes, telescope software, near-IR instrumentation, cryogenics},
year = {2006},
doi = {10.1117/12.671579},
URL = {https://doi.org/10.1117/12.671579}}

"Efficient Allocation for VoIP Packet Losses Detection Services in Programmable and Active Networks", J. J. Ramos-Munoz, J. M. Lopez-Soler, "Joint International Conference on Autonomic and Autonomous Systems and International Conference on Networking and Services - (icas-isns'05)", ISBN 0-7695-2450-8, pp. 52, 2005. DOI: 10.1109/ICAS-ICNS.2005.47

@INPROCEEDINGS{lopezsoler2005b,
author = {J. J. Ramos-Munoz and J. M. Lopez-Soler},
booktitle = {Joint International Conference on Autonomic and Autonomous Systems and International Conference on Networking and Services - (icas-isns'05)},
title = {Efficient Allocation for VoIP Packet Losses Detection Services in Programmable and Active Networks},
year = {2005},
pages = {52},
doi = {10.1109/ICAS-ICNS.2005.47},
url = {https://doi.ieeecomputersociety.org/10.1109/ICAS-ICNS.2005.47},
publisher = {IEEE Computer Society},
address = {Los Alamitos, CA, USA},
month = {October},
isbn ={0-7695-2450-8}
}

"Low Delay Multiflow Block Interleavers for Real-Time Audio Streaming", Juan J. Ramos-Munoz, Juan M. Lopez-Soler, "Networking - ICN 2005", ISBN 978-3-540-31956-6, pp. 909-916, 2005

In spite of the Internet design principle of putting the complexity on the end-to-end entities, this work contributes to demonstrate what benefits can be expected by adding some processing capabilities to the network nodes for the class of interactive audio streaming applications. In particular, we deal with the bursty-error-prone nature of the Internet by proposing and evaluating a new multiflow block interleaver algorithm. After the conducted simulations, we show that our algorithm can efficiently mitigate the negative impact of long bursts. And what it is more, it is achieved by fulfilling the end-to-end audio time constraint requirements.

@InProceedings{ramos05,
author="Ramos-Munoz, Juan J.
and Lopez-Soler, Juan M.",
editor="Lorenz, Pascal
and Dini, Petre",
title="Low Delay Multiflow Block Interleavers for Real-Time Audio Streaming",
booktitle="Networking - ICN 2005",
year="2005",
publisher="Springer Berlin Heidelberg",
address="Berlin, Heidelberg",
pages="909-916",
abstract="In spite of the Internet design principle of putting the complexity on the end-to-end entities, this work contributes to demonstrate what benefits can be expected by adding some processing capabilities to the network nodes for the class of interactive audio streaming applications. In particular, we deal with the bursty-error-prone nature of the Internet by proposing and evaluating a new multiflow block interleaver algorithm. After the conducted simulations, we show that our algorithm can efficiently mitigate the negative impact of long bursts. And what it is more, it is achieved by fulfilling the end-to-end audio time constraint requirements.",
isbn="978-3-540-31956-6"}

"Ubicacion Eficiente de Servicios de Deteccion de perdidas para VOIP en Redes Programables y de Recubrimiento", Juan Jose Ramos Munoz, Juan M. Lopez-Soler, "V Jornadas de Ingenieria Telematica, Vigo, Spain. JITEL 2005", ISBN 84-8408-346-2, pp. 321-328, 2005

@Inproceedings{lopezsoler2005a,
	title = {Ubicacion Eficiente de Servicios de Deteccion de perdidas para VOIP en Redes Programables y de Recubrimiento},
	booktitle={V Jornadas de Ingenieria Telematica, Vigo, Spain. JITEL 2005},
	isbn = {84-8408-346-2},
	author = {Juan Jose Ramos Munoz and Juan M. Lopez-Soler},
	year = {2005},
	pages = {321-328},
	project = ""
}

"Deteccion activa de perdidas de paquetes en flujos de audio en tiempo real", Juan Jose Ramos Munoz, Juan Francisco Nunez Negrillo, Juan M. Lopez-Soler, "IV Jornadas de Ingenieria Telematica JITEL 2003. Las Palmas de Gran Canaria, Spain", ISBN 84 96131 38 6, 2003

@Inproceedings{lopezsoler2003a,
	title = {Deteccion activa de perdidas de paquetes en flujos de audio en tiempo real},
	booktitle={IV Jornadas de Ingenieria Telematica JITEL 2003. Las Palmas de Gran Canaria, Spain},
	isbn = {84 96131 38 6},
	author = {Juan Jose Ramos Munoz and Juan Francisco Nunez Negrillo and Juan M. Lopez-Soler},
	month = September ,
	year = {2003},
	pages = {},
	project = ""
}

"E-Tutor: A Videoconference-Based System For Teacher-Student Advisory", Jesus Rodriguez-Penas, Pedro Garcia-Teodoro, and Jesus Esteban Diaz-Verdejo, Juan Manuel Lopez-Soler, "International Conference on Network Universities and E-learning. Valencia, Spain", ISBN 84-9705-369-9, 2003

@Inproceedings{lopezsoler2003b,
	title = {E-Tutor: A Videoconference-Based System For Teacher-Student Advisory},
	booktitle={International Conference on Network Universities and E-learning. Valencia, Spain},
	isbn = {84-9705-369-9},
	author = {Jesus Rodriguez-Penas and Pedro Garcia-Teodoro, and and Jesus Esteban Diaz-Verdejo and Juan Manuel Lopez-Soler},
	month = May,
	year = {2003},
	project = ""
}

"A New Method for Testing Dialogue Systems Based on Simulations of Real-World Conditions", Ramon Lopez-Cozar, Angel Torre, Jose Segura, Antonio Rubio, Juan M. Lopez-Soler, "7th International Conference on Spoken Language Processing, ICSLP2002 - INTERSPEECH 2002, Denver, Colorado, USA", ISBN 1-876346-40-X, 2002

@inproceedings{lopezsoler2002b,
author = {Lopez-Cozar, Ramon and Torre, Angel and Segura, Jose and Rubio, Antonio and Lopez-Soler, Juan M.},
year = {2002},
month = {September},
title = {A New Method for Testing Dialogue Systems Based on Simulations of Real-World Conditions},
booktitle={7th International Conference on Spoken Language Processing, ICSLP2002 - INTERSPEECH 2002, Denver, Colorado, USA},
isbn = {1-876346-40-X}
}

"Validacion de un Sistema de Dialogo Mediante el Uso de Diferentes Umbrales de Poda en el Proceso de Reconocimiento automaticoo de Voz", R. Lopez-Cozar, A. J. Rubio, J. E. Diaz-Verdejo, J. M. Lopez-Soler, "Revista Procesamiento del Lenguaje Natural, N. 29. ISSN 1135-5948", pp. 205-211, 2002

@Inproceedings{lopezsoler2002a,
	title = {Validacion de un Sistema de Dialogo Mediante el Uso de Diferentes Umbrales de Poda en el Proceso de Reconocimiento automaticoo de Voz},
	booktitle={Revista Procesamiento del Lenguaje Natural, N. 29. ISSN 1135-5948},
	author = {R. Lopez-Cozar and A. J. Rubio and J. E. Diaz-Verdejo and J. M. Lopez-Soler},
	year = {2002},
	pages = {205-211},
	project = ""
}

"Desarrollo de un sistema remoto de consultas y reservas mediante interfaz oral", Jesus E. Diaz-Verdejo, Pedro Garcia, Ramon Lopez-Cozar, Juan M. Lopez-Soler, Juan M. Estevez, A. Rubio Ayuso, "III Jornadas de Ingenieria Telematica JITEL-2001. Barcelona, Spain. I.S.B.N. 84-7653-783-2", pp. 199-204, 2001

@Inproceedings{lopezsoler2001b,
	title = {Desarrollo de un sistema remoto de consultas y reservas mediante interfaz oral},
	booktitle={III Jornadas de Ingenieria Telematica JITEL-2001. Barcelona, Spain. I.S.B.N. 84-7653-783-2},
	author = {Jesus E. Diaz-Verdejo and Pedro Garcia and Ramon Lopez-Cozar and Juan M. Lopez-Soler and Juan M. Estevez and A. Rubio Ayuso},
	month = September,
	year = {2001},
	pages = {199-204}
}

"Evaluacion de un Modelo Publicacion-Suscripcion para Aplicaciones de Tiempo-Real en una red de area Local", Juan M. Lopez-Soler, Jose Luis Castillo Ramirez, Gerardo Pardo-Castellote, "III Jornadas de Ingenieria Telematica JITEL-2001. Barcelona, Spain. I.S.B.N. 84-7653-783-2", pp. 535-536, 2001

@Inproceedings{lopezsoler2001a,
	title = {Evaluacion de un Modelo Publicacion-Suscripcion para Aplicaciones de Tiempo-Real en una red de area Local},
	booktitle={III Jornadas de Ingenieria Telematica JITEL-2001. Barcelona, Spain. I.S.B.N. 84-7653-783-2},
	author = {Juan M. Lopez-Soler and Jose Luis Castillo Ramirez and Gerardo Pardo-Castellote},
	month = September,
	year = {2001},
	pages = {535-536}
}

"Channel optimized matrix quantization (COMQ) of LSP parameters over waveform channels", J. L. Perez-Cordoba, A. Rubio, J. M. Lopez-Soler, V. E. Sanchez, "2001 IEEE International Conference on Acoustics, Speech, and Signal Processing. Proceedings (Cat. No.01CH37221)", pp. 725-728 vol.2, 2001. DOI: 10.1109/ICASSP.2001.941017

Combined source and channel coding is a technique to mitigate channel errors without increasing the bit error rate. Channel optimized vector quantizer (COVQ) performs these objectives in the context of vector quantization. This paper presents a study of channel optimized matrix quantizer (COMQ) applied to quantize the line spectral pair (LSP) parameters as an extension of COVQ technique. Gaussian and slow-fading Rayleigh channels are considered and GMSK (Gaussian minimum shift-keying) is used as modulation technique. Several channel signal to noise ratio (CSNR) are considered to measure the performance of this system. In addition, for comparison purposes, the performance of other schemes for quantizing the LSP parameters are computed.

@INPROCEEDINGS{941017,  author={J. L. {Perez-Cordoba} and A. {Rubio} and J. M. {Lopez-Soler} and V. E. {Sanchez}},  booktitle={2001 IEEE International Conference on Acoustics, Speech, and Signal Processing. Proceedings (Cat. No.01CH37221)},   title={Channel optimized matrix quantization (COMQ) of LSP parameters over waveform channels},   year={2001},  volume={2},  number={},  pages={725-728 vol.2},  abstract={Combined source and channel coding is a technique to mitigate channel errors without increasing the bit error rate. Channel optimized vector quantizer (COVQ) performs these objectives in the context of vector quantization. This paper presents a study of channel optimized matrix quantizer (COMQ) applied to quantize the line spectral pair (LSP) parameters as an extension of COVQ technique. Gaussian and slow-fading Rayleigh channels are considered and GMSK (Gaussian minimum shift-keying) is used as modulation technique. Several channel signal to noise ratio (CSNR) are considered to measure the performance of this system. In addition, for comparison purposes, the performance of other schemes for quantizing the LSP parameters are computed.},  keywords={AWGN;Constellation diagram;Channel coding;GSM;Code standards;Protection;Speech;Bit error rate;Vector quantization;Rayleigh channels},  doi={10.1109/ICASSP.2001.941017},  ISSN={1520-6149},  month={May}
}

"Una extension del modelo relacional para la construccion de sistemas de base de datos distribuidos", F. Crespo Sanchez, Juan M. Lopez-Soler, "Simposio Espanol de Informatica Distribuida-SEID. I.S.B.N. 84-8158-163-1
Orense, Spain", pp. 243-249, 2000

@Inproceedings{lopezsoler2000a,
	title = {Una extension del modelo relacional para la construccion de sistemas de base de datos distribuidos},
	booktitle={Simposio Espanol de Informatica Distribuida-SEID. I.S.B.N. 84-8158-163-1
Orense, Spain},
	author = {F. Crespo Sanchez and Juan M. Lopez-Soler},
	month = September,
	year = {2000},
	pages = {243-249}
}

"Un sistema telematico para la gestion de las donaciones y transplantes de organos", F. Crespo Sanchez, Alberto de Alarcon Sanchez, Juan M. Lopez-Soler, "Simposio Espanol de Informatica Distribuida-SEID. I.S.B.N. 84-8158-163-1
Orense, Spain", pp. 251-257, 2000

@Inproceedings{lopezsoler2000b,
	title = {Un sistema telematico para la gestion de las donaciones y transplantes de organos},
	booktitle={Simposio Espanol de Informatica Distribuida-SEID. I.S.B.N. 84-8158-163-1
Orense, Spain},
	author = {F. Crespo Sanchez and Alberto de Alarcon Sanchez and Juan M. Lopez-Soler},
	month = September,
	year = {2000},
	pages = {251-257}
}

"Hard-decision in COVQ over waveform channels", J. L. Perez-Cordoba, A. J. Rubio, J. M. Lopez-Soler, M. C. Benitez, "Proceedings DCC 2000. Data Compression Conference", pp. 53-62, 2000. DOI: 10.1109/DCC.2000.838145

A channel optimized vector quantizer (COVQ) is studied for the case of transmission over waveform channels. In this work, a number of modulation schemes with multidimensional signal constellations are considered, specifically, results on the binary signalling. M-ary phase-shift keying (MPSK) and M-ary quadrature amplitude modulation (MQAM) performance using COVQ with hard-decision decoding, is optimized for additive white Gaussian noise (AWGN) and flat-fading Rayleigh channel. In addition, when a flat-fading Rayleigh channel is assumed, diversity techniques are used and evaluated to improve the performance of the system.

@INPROCEEDINGS{838145,  author={J. L. {Perez-Cordoba} and A. J. {Rubio} and J. M. {Lopez-Soler} and M. C. {Benitez}},  booktitle={Proceedings DCC 2000. Data Compression Conference},   title={Hard-decision in COVQ over waveform channels},   year={2000},  volume={},  number={},  pages={53-62},  abstract={A channel optimized vector quantizer (COVQ) is studied for the case of transmission over waveform channels. In this work, a number of modulation schemes with multidimensional signal constellations are considered, specifically, results on the binary signalling. M-ary phase-shift keying (MPSK) and M-ary quadrature amplitude modulation (MQAM) performance using COVQ with hard-decision decoding, is optimized for additive white Gaussian noise (AWGN) and flat-fading Rayleigh channel. In addition, when a flat-fading Rayleigh channel is assumed, diversity techniques are used and evaluated to improve the performance of the system.},  keywords={Constellation diagram;Decoding;Rayleigh channels;Quadrature amplitude modulation;Multidimensional systems;Additive white noise;Fading;Design optimization;Source coding;Delay},  doi={10.1109/DCC.2000.838145},  ISSN={1068-0314},  month={March}
}

"Uso experimental de un umbral de confianza dinamico en el proceso de reconocimiento del habla", R. Lopez-Cozar, A.J. Rubio, A. de la Torre, Juan M. Lopez-Soler, "Procesamiento del lenguaje natural. ISSN: 1135-5948. e-ISSN: 1989-7553. Vol. 25", pp. 123-128, 1999

@Inproceedings{lopezsoler1999,
	title = {Uso experimental de un umbral de confianza dinamico en el proceso de reconocimiento del habla},
	booktitle={Procesamiento del lenguaje natural. ISSN: 1135-5948. e-ISSN: 1989-7553. Vol. 25},
	author = {R. Lopez-Cozar and A.J. Rubio and A. de la Torre and Juan M. Lopez-Soler},
	month = September,
	year = {1999},
	pages = {123-128}
}

"Speech Recognition and the New Technologies in Communications: A Continuous Speech Recognition-Based Switchboard with an Answering Module for E-mailing Voice Messages", P. Garcia, J.C. Segura, J. Diaz-Verdejo, A. Rubio, M.C. Benitez, A. Peinado, Juan M. Lopez-Soler, J.L. Perez, V. Sanchez, A. de la Torre, R. Lopez-Cozar, "Proceedings of the First International Conference on Language Resources and Evaluation. Vol. II. Granada, Spain", pp. 1263-1266, 1998

@Inproceedings{lopezsoler1998a,
	title = {Speech Recognition and the New Technologies in Communications: A Continuous Speech Recognition-Based Switchboard with an Answering Module for E-mailing Voice Messages},
	booktitle={Proceedings of the First International Conference on Language Resources and Evaluation. Vol. II. Granada, Spain},
	author = {P. Garcia and J.C. Segura and J. Diaz-Verdejo and A. Rubio and M.C. Benitez and A. Peinado and Juan M. Lopez-Soler and J.L. Perez and V. Sanchez and A. de la Torre and R. Lopez-Cozar},
	year = {1998},
	pages = {1263-1266}
}

"STACC: An Automatic Service for Information Access Using Continuous Speech Recognition through Telephone Line", Antonio J. Rubio, Pedro Garcia, Angel de la Torre, Jose C. Segura, Jesus Diaz-Verdejo, Maria C. Benitez, Victoria Sanchez, Antonio M. Peinado, Juan M. Lopez-Soler, Jose L. Perez-Cordoba, "Fifth European Conference on Speech Communication and Technology, EUROSPEECH 1997, Rhodes, Greece", pp. 1779-1782, 1997

@inproceedings{lopezsoler1997,
author = {Antonio J. Rubio and Pedro Garcia and Angel de la Torre and Jose C. Segura and Jesus Diaz-Verdejo and Maria C. Benitez and Victoria Sanchez and Antonio M. Peinado and Juan M. Lopez-Soler and Jose L. Perez-Cordoba},
title = {STACC: An Automatic Service for Information Access Using Continuous Speech Recognition through Telephone Line},
booktitle={Fifth European Conference on Speech Communication and Technology, EUROSPEECH 1997, Rhodes, Greece},
year = {1997},
month = {September},
pages = {1779-1782}
}

"Excitation Parameters Encoding with a Combined Quantization-Interpolation Algorithm", J. M. Lopez-Soler, A. Rubio-Ayuso, "Proceedings. IEEE Workshop on Speech Coding for Telecommunications", pp. 91-92, 1995. DOI: 10.1109/SCFT.1995.658142

@INPROCEEDINGS{658142,  author={J. M. {Lopez-Soler} and A. {Rubio-Ayuso}},  booktitle={Proceedings. IEEE Workshop on Speech Coding for Telecommunications},   title={Excitation Parameters Encoding with a Combined Quantization-Interpolation Algorithm},   year={1995},  volume={},  number={},  pages={91-92},  abstract={},  keywords={Encoding;Algorithm design and analysis;Linear predictive coding;Interpolation;Speech coding;Costs;Bit rate;Signal analysis;Cloning;Rate-distortion},  doi={10.1109/SCFT.1995.658142},  ISSN={},  month={September}}

"Transform trellis coded quantization of speech using small frame sizes", V. E. Sanchez, J. L. Perez, J. M. Lopez, A. J. Rubio, "Proceedings of ICASSP '94. IEEE International Conference on Acoustics, Speech and Signal Processing", pp. I/177-I/180 vol.1, 1994. DOI: 10.1109/ICASSP.1994.389326

Proposes a transform trellis coded quantization (TTCQ) scheme suitable for low-delay speech coding. This scheme is based on a general transform domain formulation for small frame sizes and the trellis coded quantization technique previously proposed where Ungerboeck's amplitude modulation trellises and set partitioning ideas are used for source coding. Using the discrete cosine transform the authors apply this technique to the coding of 7 kHz wideband speech, a matter of interest due to ISDN based applications. A 32 kbps low-delay coder is developed, simulation results showing a very high speech quality comparable to that obtained by the G722 standard at 64 kbps.<>

@INPROCEEDINGS{389326,
author={V. E. {Sanchez} and J. L. {Perez} and J. M. Lopez and A. J. {Rubio}},  booktitle={Proceedings of ICASSP '94. IEEE International Conference on Acoustics, Speech and Signal Processing},   title={Transform trellis coded quantization of speech using small frame sizes},   year={1994},  volume={i},  number={},  pages={I/177-I/180 vol.1},  abstract={Proposes a transform trellis coded quantization (TTCQ) scheme suitable for low-delay speech coding. This scheme is based on a general transform domain formulation for small frame sizes and the trellis coded quantization technique previously proposed where Ungerboeck's amplitude modulation trellises and set partitioning ideas are used for source coding. Using the discrete cosine transform the authors apply this technique to the coding of 7 kHz wideband speech, a matter of interest due to ISDN based applications. A 32 kbps low-delay coder is developed, simulation results showing a very high speech quality comparable to that obtained by the G722 standard at 64 kbps.<>},  keywords={Quantization;Discrete transforms;Speech coding;Amplitude modulation;Source coding;Discrete cosine transforms;Wideband;ISDN;Code standards;Standards development},  doi={10.1109/ICASSP.1994.389326},  ISSN={1520-6149},  month={April}
}

"A combined quantization-interpolation scheme for very low bit rate coding of speech LSP parameters", J. M. Lopez-Soler, N. Farvardin, "1993 IEEE International Conference on Acoustics, Speech, and Signal Processing", pp. 21-24 vol.2, 1993. DOI: 10.1109/ICASSP.1993.319218

A combined quantization-interpolation of speech line spectrum pair (LSP) parameters is proposed. To utilize the linear dependency between successive LSP frames, the proposed algorithm attempts to locate the frames where there is a significant spectral change; these frames are encoded by vector quantization. The remaining frames are reconstructed by linear interpolation between the vector-quantized frames. A two-pass algorithm is used to couple the quantization and interpolation operations. Simulation results for the performance of the combined quantization-interpolation approach indicate that, at rates below 350 bits/s (for coding the spectral parameters), the proposed scheme outperforms the multiframe coding scheme of D. P. Kemp et al. (ICASSP-91, p.609-12). The effect of maximum delay on the overall performance is studied, and the performance of the proposed system over noisy channels is examined.<>

@INPROCEEDINGS{319218,  author={J. M. {Lopez-Soler} and N. {Farvardin}},  booktitle={1993 IEEE International Conference on Acoustics, Speech, and Signal Processing},   title={A combined quantization-interpolation scheme for very low bit rate coding of speech LSP parameters},   year={1993},  volume={2},  number={},  pages={21-24 vol.2},  abstract={A combined quantization-interpolation of speech line spectrum pair (LSP) parameters is proposed. To utilize the linear dependency between successive LSP frames, the proposed algorithm attempts to locate the frames where there is a significant spectral change; these frames are encoded by vector quantization. The remaining frames are reconstructed by linear interpolation between the vector-quantized frames. A two-pass algorithm is used to couple the quantization and interpolation operations. Simulation results for the performance of the combined quantization-interpolation approach indicate that, at rates below 350 bits/s (for coding the spectral parameters), the proposed scheme outperforms the multiframe coding scheme of D. P. Kemp et al. (ICASSP-91, p.609-12). The effect of maximum delay on the overall performance is studied, and the performance of the proposed system over noisy channels is examined.<>},  keywords={Bit rate;Speech coding;Interpolation;Rate-distortion;Linear predictive coding;Encoding;Educational institutions;Vector quantization;Delay effects;Vocoders},  doi={10.1109/ICASSP.1993.319218},  ISSN={1520-6149},  month={April}
}

"Realizacion de un sintetizador multipulso para un conversor texto-voz en castellano", A.J. Rubio, J.C. Segura, V.E. Sanchez, Juan M. Lopez-Soler, J.L. Perez, "Sociedad Espanola para el Procesamiento del Lenguaje Natural- SEPLN. Boletin SEPLN. N. 13. Granada, Spain", pp. 401-410, 1993

@Inproceedings{lopezsoler1993a,
	title = {Realizacion de un sintetizador multipulso para un conversor texto-voz en castellano},
	booktitle={Sociedad Espanola para el Procesamiento del Lenguaje Natural- SEPLN. Boletin SEPLN. N. 13. Granada, Spain},
	author = {A.J. Rubio and J.C. Segura and V.E. Sanchez and Juan M. Lopez-Soler and J.L. Perez},
	month = February,
	year = {1993},
	pages = {401-410}
}

"Simulacion de un servicio remoto de suministro mediante reconocimiento automaticoo de palabras aisladas", J.C. Segura, Juan M. Lopez-Soler, A.J. Rubio, P. Garcia, A.M. Peinado, "Sociedad Espanola para el Procesamiento del Lenguaje Natural- SEPLN. Boletin SEPLN. N. 13. Granada, Spain", pp. 463-464, 1993

@Inproceedings{lopezsoler1993b,
     title = {Simulacion de un servicio remoto de suministro mediante reconocimiento automaticoo de palabras aisladas},
	booktitle={Sociedad Espanola para el Procesamiento del Lenguaje Natural- SEPLN. Boletin SEPLN. N. 13. Granada, Spain},
	author = {J.C. Segura and Juan M. Lopez-Soler and A.J. Rubio and P. Garcia and A.M. Peinado},
	month = February,
	year = {1993},
	pages = {463-464}
}

"Frequency Domain Low-Delay Wideband Coding of Speech at 32 Kbps", V.E. Sanchez, J.P. Adoul, A.J. Rubio, Juan M. Lopez-Soler, "Proceedings of the International Conference on Signal Processing Applications and Technology. Boston, USA", 1992

@Inproceedings{lopezsoler1992b,
	title = {Frequency Domain Low-Delay Wideband Coding of Speech at 32 Kbps},
	booktitle={Proceedings of the International Conference on Signal Processing Applications and Technology. Boston, USA},
	author = {V.E. Sanchez and J.P. Adoul and A.J. Rubio and Juan M. Lopez-Soler},
	month = November,
	year = {1992}
}

"Una red neuronal recurrente para evaluacion de modelos ocultos de Markov semicontinuos", J.E. Diaz Verdejo, J.C. Segura Luna, A. Rubio Ayuso, A. Peinado Herreros, Juan M. Lopez-Soler, "URSI-92. Malaga, Spain", 1992

@Inproceedings{lopezsoler1992a,
	title = {Una red neuronal recurrente para evaluacion de modelos ocultos de Markov semicontinuos},
	booktitle={URSI-92. Malaga, Spain},
	author = {J.E. Diaz Verdejo and J.C. Segura Luna and A. Rubio Ayuso and A. Peinado Herreros and Juan M. Lopez-Soler},
	month = September,
	year = {1992}
}

"Including duration Information in a threshold-based rejector for HMM Speech Recognition", A.M. Peinado, A. Rubio, Juan M. Lopez-Soler, J.C. Segura, V. Sanchez, "XIIeme Congres International des Sciencies Phonetiques. Aix-en-Provence (France)", 1991

@Inproceedings{lopezsoler1991a,
	title = {Including duration Information in a threshold-based rejector for HMM Speech Recognition},
	booktitle={XIIeme Congres International des Sciencies Phonetiques. Aix-en-Provence (France)},
	author = {A.M. Peinado and A. Rubio and Juan M. Lopez-Soler and J.C. Segura and V. Sanchez},
	month = August,
	year = {1991}
}

"Comparison of the modified Hermite transformation with other unitary transformations in a predictive transform coding scheme", Victoria Sanchez, Antonio Peinado, Juan M. Lopez-Soler, Jose C. Segura, Antonio Rubio, "XIIeme Congres International des Sciencies Phonetiques. Aix-en-Provence (France)", 1991

@Inproceedings{lopezsoler1991b,
	title = {Comparison of the modified Hermite transformation with other unitary transformations in a predictive transform coding scheme},
	booktitle={XIIeme Congres International des Sciencies Phonetiques. Aix-en-Provence (France)},
	author = {Victoria Sanchez and Antonio Peinado and Juan M. Lopez-Soler and Jose C. Segura and Antonio Rubio},
	month = August,
	year = {1991}
}

"Bottom to top algorithms for tree-codebook design in vector quantization for speech coding", Juan M. Lopez-Soler, A.M. Peinado, J.C. Segura, V. Sanchez, A. Rubio, "1990 IEEE BILKENT International Conference on New Trends in Communication, Control and Signal Processing. Vol. II, Ankara (Turkey)", ISBN 0444887628, pp. 1109-1113, 1990

@Inproceedings{lopezsoler1990b,
	title = {Bottom to top algorithms for tree-codebook design in vector quantization for speech coding},
	booktitle={1990 IEEE BILKENT International Conference on New Trends in Communication, Control and Signal Processing. Vol. II, Ankara (Turkey)},
	isbn = {0444887628},
	author = {Juan M. Lopez-Soler and A.M. Peinado and J.C. Segura and  V. Sanchez and A. Rubio},
	month = December,
	year = {1990},
	pages = {1109-1113}
}

"Increasing the difference between the significant singular values and the non-significant singular values in a model of LPC excitation based on the SVD", V. Sanchez, Juan M. Lopez-Soler, J.C. Segura, A.M. Peinado, A. Rubio, "European Signal Processing Conference. EUSIPCO-90. Barcelona, Spain", pp. 1251-1254, 1990

@Inproceedings{lopezsoler1990c,
	title = {Increasing the difference between the significant singular values and the non-significant singular values in a model of LPC excitation based on the SVD},
	booktitle={European Signal Processing Conference. EUSIPCO-90. Barcelona, Spain},
	author = {V. Sanchez and Juan M. Lopez-Soler and J.C. Segura and A.M. Peinado and A. Rubio},
	month = September,
	year = {1990},
	pages = 1251-1254}

"Signal segmentation into spectral homogeneous units", J.C. Segura, Juan M. Lopez-Soler, A.M. Peinado, V. Sanchez, A. Rubio, "European Signal Processing Conference. EUSIPCO-90. Barcelona, Spain", pp. 1278-1290, 1990

@Inproceedings{lopezsoler1990d,
	title = {Signal segmentation into spectral homogeneous units},
	booktitle={European Signal Processing Conference. EUSIPCO-90. Barcelona, Spain},
	author = {J.C. Segura and Juan M. Lopez-Soler and A.M. Peinado and V. Sanchez and A. Rubio},
	month = September,
	year = {1990},
	pages = {1278-1290}
}

"Reconocimiento de voz mediante Modelos Discretos de Markov para Control de un Robot mediante voz", A.M. Peinado, Juan M. Lopez-Soler, J.C. Segura, V. Sanchez, A. Rubio, "IV Simposium Nacional de Reconocimiento de Formas y Analisis de Imagenes", pp. 109-110, 1990

@Inproceedings{lopezsoler1990f,
	title = {Reconocimiento de voz mediante Modelos Discretos de Markov para Control de un Robot mediante voz},
	booktitle={IV Simposium Nacional de Reconocimiento de Formas y Analisis de Imagenes},
	author = {A.M. Peinado and Juan M. Lopez-Soler and J.C. Segura and V. Sanchez and A. Rubio},
	month = September,
	year = {1990},
	pages = {109-110}
}

"Distance measures performance in VQ", Juan M. Lopez-Soler, A.M. Peinado, J.C. Segura, V. Sanchez, A. Rubio, "European Signal Processing Conference. EUSIPCO-90. Barcelona, Spain", pp. 1278-1290, 1990

@Inproceedings{lopezsoler1990e,
	title = {Distance measures performance in VQ},
	booktitle={European Signal Processing Conference. EUSIPCO-90. Barcelona, Spain},
	author = {Juan M. Lopez-Soler and A.M. Peinado and J.C. Segura and V. Sanchez and A. Rubio},
	month = September,
	year = {1990},
	pages = {1278-1290}
}

"A tree codebook design algorithm for digital speech storage using vector quantization", Juan M. Lopez-Soler, M.C. Benitez, J.A. Galvez, V. Sanchez, A. Rubio, "Fourth International Symposium on Knowledge Engineering, Barcelona, Spain", 1990

@Inproceedings{lopezsoler1990a,
	title = {A tree codebook design algorithm for digital speech storage using vector quantization},
	booktitle={Fourth International Symposium on Knowledge Engineering, Barcelona, Spain},
		author = {Juan M. Lopez-Soler and M.C. Benitez and J.A. Galvez and V. Sanchez and A. Rubio},
	month = May,
	year = {1990}
}

"Network Functions Virtualisation (NFV) Release 3; Evolution and Ecosystem; Report on Network Slicing Support with ETSI NFV Architecture Framework", Jose A. Ordonez, Juan J. Ramos, Pablo Ameigeiras, Juan M. Lopez-Soler et al., ETSI, pp. 1-35, 2017

@techreport{ordonez2017etsii,
   AUTHOR = "Jose A. Ordonez and Juan J. Ramos and Pablo Ameigeiras and Juan M. Lopez-Soler et al.",
   TITLE = "Network Functions Virtualisation (NFV) Release 3; Evolution and Ecosystem; Report on Network Slicing Support with ETSI NFV Architecture Framework",
   HOWPUBLISHED = {ETSI Group Report},
   TYPE="standard",
   PAGES = {1-35},
   YEAR = {2017},
   MONTH = {December},
   INSTITUTION = "{ETSI}",
   NUMBER = "Network Functions Virtualisation (NFV) ETSI Industry Specification Group (ISG) ETSI GR NFV-EVE 012 V3.1.1",
   URL={https://www.etsi.org/deliver/etsi_gr/NFV-EVE/001_099/012/03.01.01_60/gr_nfv-eve012v030101p.pdf},
   note="standard"
}

"Project H2020 5G-CLARITY  (Grant No. 871428): Deliverable D6.7. Restricted Deliverable on Exploitation Plan", R. Bian, H. Garcia-Nieto, J. Gutierrez, V. Sark, T. Cogalan, C. Colman-Meixner, A. Garcia, J. A. Amoros, A. Yesilkaya, H. Alshaer, P. Munoz-Luengo, J. M. Lopez-Soler, J. A. Ordonez-Lucena, J. McNamara, M. Ghoraishi, 5G-CLARITY, 2022

@techreport{5GCLARITYD67,
  author      = "R. Bian and H. Garcia-Nieto and J. Gutierrez and V. Sark and T. Cogalan and C. Colman-Meixner and A. Garcia and J. A. Amoros and A. Yesilkaya and H. Alshaer and P. Munoz-Luengo and J. M. Lopez-Soler and J. A. Ordonez-Lucena and J. McNamara and M. Ghoraishi",
  title       = "Project H2020 5G-CLARITY  (Grant No. 871428): Deliverable D6.7. Restricted Deliverable on Exploitation Plan",
  institution = "5G-CLARITY",
  year        = "2022",
  type        = "deliverable",
  month       = "February",
  URL         = {https://5gclarity.com/wp-content/uploads/2022/07/5G-CLARITY_D67.pdf},
  project     = {5gclarity}
}

"Project H2020 5G-CLARITY  (Grant No. 871428): Deliverable D6.3. Mid-term report on disseminations and communications activities", J. M. Lopez-Soler, T. Cogalan, R. Bian, J. Gutierrez, M. Ghoraishi, 5G-CLARITY, 2021

@techreport{5GCLARITYD63,
  author      = "J. M. {Lopez-Soler} and T. Cogalan and R. Bian and J. Gutierrez and M. Ghoraishi",
  title       = "Project H2020 5G-CLARITY  (Grant No. 871428): Deliverable D6.3. Mid-term report on disseminations and communications activities",
  institution = "5G-CLARITY",
  year        = "2021",
  type        = "deliverable",
  month       = "May",
  URL         = {https://www.5gclarity.com/wp-content/uploads/2021/05/5G-CLARITY_D63.pdf},
  project     = {5gclarity}
}

"Project H2020 5G-CLARITY  (Grant No. 871428): Deliverable D6.1. Plan for explotation and dissemination of the project results", J. M. Lopez-Soler, O. Adamuz-Hinojosa, J. Navarro-Ortiz, L. Chinchilla-Romero, J. Prados-Garzon, J. Ordonez-Lucena, G. Rigazzi, U. Olvera-Hernandez, D. Camps-Mur, A. Garcia, T. Cogalan, S. Yan, R. Bian, E. Aumayr, M. A. Granda, J. Gutierrez-Teran, M. Ghoraishi, 5G-CLARITY, 2020

@techreport{5GCLARITYD61,
  author      = "J. M. {Lopez-Soler} and O. {Adamuz-Hinojosa} and J. {Navarro-Ortiz} and L. {Chinchilla-Romero} and J. {Prados-Garzon} and J. {Ordonez-Lucena} and G. {Rigazzi} and U. {Olvera-Hernandez} and D. {Camps-Mur} and A. {Garcia} and T. {Cogalan} and S. {Yan} and R. {Bian} and E. {Aumayr} and M. A. {Granda} and J. {Gutierrez-Teran} and M. Ghoraishi",
  title       = "Project H2020 5G-CLARITY  (Grant No. 871428): Deliverable D6.1. Plan for explotation and dissemination of the project results",
  institution = "5G-CLARITY",
  year        = "2020",
  type        = "deliverable",
  month       = "Jan",
  URL         = {https://www.5gclarity.com/wp-content/uploads/2020/06/5G-CLARITY_D61.pdf},
  project     = {5gclarity}
}

"Speech Recognition and Coding: New Advances and Trends", Antonio J. Rubio Ayuso, Juan M. Lopez-Soler, ISBN 978-3-540-60098-5, pp. 1-505, 1995. DOI: https://doi.org/10.1007/978-3-642-57745-1

Based on a NATO Advanced Study Institute held in 1993, this book addresses recent advances in automatic speech recognition and speech coding. The book contains contributions by many of the most outstanding researchers from the best laboratories worldwide in the field. The contributions have been grouped into five parts: on acoustic modeling; language modeling; speech processing, analysis and synthesis; speech coding; and vector quantization and neural nets. For each of these topics, some of the best-known researchers were invited to give a lecture. In addition to these lectures, the topics were complemented with discussions and presentations of the work of those attending. Altogether, the reader is given a wide perspective on recent advances in the field and will be able to see the trends for future work.

@Book{speech95,
  title  = {Speech Recognition and Coding: New Advances and Trends},
  year   = {1995},
  author = {Antonio J. Rubio Ayuso and Juan M. Lopez-Soler},
  publisher = {Springer, Berlin, Heidelberg. NATO ASI Series},
  isbn   = {978-3-540-60098-5},
  url    = {https://link.springer.com/book/10.1007/978-3-642-57745-1},
  pages = {1-505},
  doi = {https://doi.org/10.1007/978-3-642-57745-1},
  abstract = {Based on a NATO Advanced Study Institute held in 1993, this book addresses recent advances in automatic speech recognition and speech coding. The book contains contributions by many of the most outstanding researchers from the best laboratories worldwide in the field. The contributions have been grouped into five parts: on acoustic modeling; language modeling; speech processing, analysis and synthesis; speech coding; and vector quantization and neural nets. For each of these topics, some of the best-known researchers were invited to give a lecture. In addition to these lectures, the topics were complemented with discussions and presentations of the work of those attending. Altogether, the reader is given a wide perspective on recent advances in the field and will be able to see the trends for future work.},
  note   = {research}
}

"Metodos de configuracion de redes sensibles al retardo basadas en planificadores con conformacion de trafico asincrono, y con calidad de servicio determinista", Universidad de Granada, Julia Caleya-Sanchez, Jonathan Prados-Garzon, Pablo Ameigeiras, Lorena Chinchilla-Romero, Pablo Munoz-Luengo, Juan M. Lopez-Soler, 2023

@patent{Caleya2023,
	title = {Metodos de configuracion de redes sensibles al retardo basadas en planificadores con conformacion de trafico asincrono, y con calidad de servicio determinista},
	commenturl = {https://patentscope.wipo.int/search/en/detail.jsf?docId=WO2003049354},
	language = {es},
	assignee = {Universidad de Granada},
	commenturldate = {2023-xx-xx},
	author = {Caleya-Sanchez, Julia and Prados-Garzon, Jonathan and Ameigeiras, Pablo and Chinchilla-Romero, Lorena and Munoz-Luengo, Pablo and Lopez-Soler, Juan M.},
	commentmonth = Jun,
	year = {2023},
  project = {6gchronos|true5g|5gclarity}
}

"Procedure and system for integration of LPWAN networks and 4G/5G suitable for use in industrial internet applications of things", Universidad de Granada, Application No. P201830137, Publication No. ES2722927 A1, Jorge Navarro-Ortiz, Sandra Sendra, Pablo Ameigeiras Gutierrez, Juan Manuel Lopez-Soler, 2018

@patent{navarro2019,
	title = {Procedure and system for integration of LPWAN networks and 4G/5G suitable for use in industrial internet applications of things},
	url = {http://consultas2.oepm.es/InvenesWeb/detalle?referencia=P201830137},
	language = {es},
	assignee = {Universidad de Granada, Application No. P201830137, Publication No. ES2722927 A1},
	urldate = {2019-08-20},
	author = {Navarro-Ortiz, Jorge and Sendra, Sandra and Ameigeiras Gutierrez, Pablo and Lopez-Soler, Juan Manuel},
	month = Aug,
	year = {2018}
}

"A Method and a System for Scheduling the Downlink in Long Term Evolution (lte) Networks Based on Quality of Service (qos)", TELEFONICA, S.A., International Application No. PCT/EP2013/053324, Publication No. WO/2013/127665, Pablo Ameigeiras, Jorge Navarro-Ortiz, Juan Manuel Lopez-Soler, Raquel Garcia-Perez, Quiliano Perez-Tarrero, Javier Lorca-Hernando, 2013

A Method and a System for scheduling the downlink in Long Term Evolution (LTE) networks based on Quality of Service (QoS) The method comprises: performing a packet scheduling for a plurality of user terminals (UEs) based on information regarding QoS classes, said information regarding QoS classes is included in QoS class identifiers received from an Evolved Packet Core providing communication services to said user terminals, said method further comprising receiving channel quality indicators from said plurality of user terminals and performing said scheduling also on the basis of said received channel quality indicators. The system of the invention is arranged to implement the method of the invention.

@patent{ameigeirasgutierrezmethod2013,
	title = {A {Method} and a {System} for {Scheduling} the {Downlink} in {Long} {Term} {Evolution} (lte) {Networks} {Based} on {Quality} of {Service} (qos)},
	url = {https://patentscope.wipo.int/search/en/detail.jsf?docId=WO2013127665},
	abstract = {A Method and a System for scheduling the downlink in Long Term Evolution (LTE) networks based on Quality of Service (QoS) The method comprises: performing a packet scheduling for a plurality of user terminals (UEs) based on information regarding QoS classes, said information regarding QoS classes is included in QoS class identifiers received from an Evolved Packet Core providing communication services to said user terminals, said method further comprising receiving channel quality indicators from said plurality of user terminals and performing said scheduling also on the basis of said received channel quality indicators. The system of the invention is arranged to implement the method of the invention.},
	language = {en},
	assignee = {TELEFONICA, S.A., International Application No. PCT/EP2013/053324, Publication No. WO/2013/127665},
	urldate = {2021-03-23},
	author = {Ameigeiras, Pablo and Navarro-Ortiz, Jorge and Lopez-Soler, Juan Manuel and Garcia-Perez, Raquel and Perez-Tarrero, Quiliano and Lorca-Hernando, Javier},
	month = September,
	year = {2013},
	keywords = {A Method and a System for Scheduling the Downlink in Long Term Evolution (lte) Networks Based on Quality of Service (qos)}
}