Capítols de llibrehttp://hdl.handle.net/2117/55082024-03-28T22:38:01Z2024-03-28T22:38:01ZDesign and performance analysis of enhanced directional MAC protocols for cognitive radio wireless mesh networksAtlabachew, MulugetaCasademont Serra, JordiNegash, Yalemzewdhttp://hdl.handle.net/2117/3667952022-05-04T10:50:27Z2022-05-04T10:42:28ZDesign and performance analysis of enhanced directional MAC protocols for cognitive radio wireless mesh networks
Atlabachew, Mulugeta; Casademont Serra, Jordi; Negash, Yalemzewd
This paper presents the design and analysis of directional random access MAC protocols for cognitive radio wireless mesh network (CRWMN). We have proposed three directional random access MAC protocols for CRWMNs using three different access mechanisms called Directional CSMA/CA MAC protocols for Cognitive Radio (DCR-MAC). An event driven simulator is used to make performance comparison for the three MAC protocols. Moreover, the performances of the DCR-MAC protocol for the three access mechanisms are also compared with an omni-directional CRMAC protocol in terms of average throughput and average packet delay. The performances of the proposed directional protocols show better performance for CRWMN.
2022-05-04T10:42:28ZAtlabachew, MulugetaCasademont Serra, JordiNegash, YalemzewdThis paper presents the design and analysis of directional random access MAC protocols for cognitive radio wireless mesh network (CRWMN). We have proposed three directional random access MAC protocols for CRWMNs using three different access mechanisms called Directional CSMA/CA MAC protocols for Cognitive Radio (DCR-MAC). An event driven simulator is used to make performance comparison for the three MAC protocols. Moreover, the performances of the DCR-MAC protocol for the three access mechanisms are also compared with an omni-directional CRMAC protocol in terms of average throughput and average packet delay. The performances of the proposed directional protocols show better performance for CRWMN.Multiple antenna (MA) for cognitive radio based wireless mesh networks (CRWMNs): Spectrum Sensing (SS)Atlabachew, MulugetaCasademont Serra, JordiNegash, Yalemzewdhttp://hdl.handle.net/2117/3638322022-03-10T13:30:46Z2022-03-10T13:20:45ZMultiple antenna (MA) for cognitive radio based wireless mesh networks (CRWMNs): Spectrum Sensing (SS)
Atlabachew, Mulugeta; Casademont Serra, Jordi; Negash, Yalemzewd
The concept of cognitive radio (CR) rings a big paradigm shift to the wireless communication domain. Extending this concept in to wireless mesh networks (WMN) results a CRWMN which alleviates the pragmatic spectrum congestion in the ISM bands. The assimilation of MAs technology in to CRWMN brings an astonishing system performance improvement. The use of MAs in WMN improves system capacity and reliability, increases coverage area and spectrum usage efficiency; and result in lower power consumption, better interference cancellation, efficient spectrum sensing, and spectrum sharing. In spite of the significant advantages, the use of multiple antennas has considerable limitations. In this paper, we investigate the challenges, opportunities, and the possible research directions that the cognitive radio network (CRN) in general and the CRWMN in particular experience while incorporating MAs to the system and its effect on spectrum sensing.
2022-03-10T13:20:45ZAtlabachew, MulugetaCasademont Serra, JordiNegash, YalemzewdThe concept of cognitive radio (CR) rings a big paradigm shift to the wireless communication domain. Extending this concept in to wireless mesh networks (WMN) results a CRWMN which alleviates the pragmatic spectrum congestion in the ISM bands. The assimilation of MAs technology in to CRWMN brings an astonishing system performance improvement. The use of MAs in WMN improves system capacity and reliability, increases coverage area and spectrum usage efficiency; and result in lower power consumption, better interference cancellation, efficient spectrum sensing, and spectrum sharing. In spite of the significant advantages, the use of multiple antennas has considerable limitations. In this paper, we investigate the challenges, opportunities, and the possible research directions that the cognitive radio network (CRN) in general and the CRWMN in particular experience while incorporating MAs to the system and its effect on spectrum sensing.Assessment of exams at Atenea, an IMS LTI application for scalability problemsAlier Forment, MarcCasany Guerrero, María JoséLlorens García, AriadnaAlcober Segura, Jesús ÁngelPrat Farran, Joana d'Archttp://hdl.handle.net/2117/3625852022-02-17T14:22:08Z2022-02-17T14:18:26ZAssessment of exams at Atenea, an IMS LTI application for scalability problems
Alier Forment, Marc; Casany Guerrero, María José; Llorens García, Ariadna; Alcober Segura, Jesús Ángel; Prat Farran, Joana d'Arc
The online teaching support platform was changed by the Universitat Politècnica de Catalunya in 2004. Moodle, an open source software, was used in place of the prior proprietary software. The population's confinement at home owing to the COVID-19 pandemic in 2020 was a stress test for the whole university community, particularly those responsible for providing support for the online teaching support platform. Concerns about possible scalability challenges with the quiz functionality during the examination period arose as a result of the increased activity and the prospect of the generalization of online assessment. The solution included deploying a high-performance version of the Moodle Quiz Module As A Service (SaaS) to plug-and-play within the university's LMS without relying on internal resources using Moodle's IMS LTI interoperability features. This study aims at analyzing the solution, which included a systems strategy, private cloud operations, internal communication, and teacher training, that allowed the university course to be assessed in a confined space.
2022-02-17T14:18:26ZAlier Forment, MarcCasany Guerrero, María JoséLlorens García, AriadnaAlcober Segura, Jesús ÁngelPrat Farran, Joana d'ArcThe online teaching support platform was changed by the Universitat Politècnica de Catalunya in 2004. Moodle, an open source software, was used in place of the prior proprietary software. The population's confinement at home owing to the COVID-19 pandemic in 2020 was a stress test for the whole university community, particularly those responsible for providing support for the online teaching support platform. Concerns about possible scalability challenges with the quiz functionality during the examination period arose as a result of the increased activity and the prospect of the generalization of online assessment. The solution included deploying a high-performance version of the Moodle Quiz Module As A Service (SaaS) to plug-and-play within the university's LMS without relying on internal resources using Moodle's IMS LTI interoperability features. This study aims at analyzing the solution, which included a systems strategy, private cloud operations, internal communication, and teacher training, that allowed the university course to be assessed in a confined space.Diseño e implementación de servicios para redes vehiculares en ciudades inteligentesTripp Barba, CarolinaAguilar Igartua, MónicaZaldivar Colado, AníbalUrquiza Aguiar, Luis Felipehttp://hdl.handle.net/2117/3433252021-04-11T04:07:11Z2021-04-08T12:15:17ZDiseño e implementación de servicios para redes vehiculares en ciudades inteligentes
Tripp Barba, Carolina; Aguilar Igartua, Mónica; Zaldivar Colado, Aníbal; Urquiza Aguiar, Luis Felipe
2021-04-08T12:15:17ZTripp Barba, CarolinaAguilar Igartua, MónicaZaldivar Colado, AníbalUrquiza Aguiar, Luis FelipeThe resources placement problem in a 5G hierarchical SDN control planeLeyva Pupo, IrianCervelló Pastor, CristinaLlorens Carrodeguas, Alejandrohttp://hdl.handle.net/2117/1835562023-06-11T06:59:32Z2020-04-16T09:45:15ZThe resources placement problem in a 5G hierarchical SDN control plane
Leyva Pupo, Irian; Cervelló Pastor, Cristina; Llorens Carrodeguas, Alejandro
In this paper, we address the SDN Controllers and Virtual Network Functions (VNFs) placement problem in 5G networks. To this aim, we propose an architecture for the 5G Control Plane and a method to determine the optimal placement of controllers and VNFs. The placement is determined according not only to latency and capacity requirements but also to type of Network Function (NF).
2020-04-16T09:45:15ZLeyva Pupo, IrianCervelló Pastor, CristinaLlorens Carrodeguas, AlejandroIn this paper, we address the SDN Controllers and Virtual Network Functions (VNFs) placement problem in 5G networks. To this aim, we propose an architecture for the 5G Control Plane and a method to determine the optimal placement of controllers and VNFs. The placement is determined according not only to latency and capacity requirements but also to type of Network Function (NF).Optimal placement of User Plane Functions in 5G networksLeyva Pupo, IrianCervelló Pastor, CristinaLlorens Carrodeguas, Alejandrohttp://hdl.handle.net/2117/1792412023-06-11T04:50:57Z2020-03-05T11:34:14ZOptimal placement of User Plane Functions in 5G networks
Leyva Pupo, Irian; Cervelló Pastor, Cristina; Llorens Carrodeguas, Alejandro
Because of developments in society and technology, new services and use cases have emerged, such as vehicle-to-everything communication and smart manufacturing. Some of these services have stringent requirements in terms of reliability, bandwidth, and network response
time and to meet them, deploying network functions (NFs) closer to users is necessary. Doing so will lead to an increase in costs and the number of NFs. Under such circumstances, the use of optimization strategies for the placement of NFs is crucial to offer Quality of Service (QoS) in a cost-effective manner. In this vein, this paper addresses the User Plane Functions Placement (UPFP) problem in 5G networks. The UPFP is modeled as a Mixed-Integer Linear Programming (MILP) problem aimed at determining the optimal number and location of User Plane Functions (UPFs). Two optimization models are proposed that considered various parameters, such as latency, reliability and user mobility. To evaluate their performance, two services under the Ultra-Reliable an Low-Latency Communication (URLLC) category were selected. The acquired results showcase the effectiveness of our solutions.
2020-03-05T11:34:14ZLeyva Pupo, IrianCervelló Pastor, CristinaLlorens Carrodeguas, AlejandroBecause of developments in society and technology, new services and use cases have emerged, such as vehicle-to-everything communication and smart manufacturing. Some of these services have stringent requirements in terms of reliability, bandwidth, and network response
time and to meet them, deploying network functions (NFs) closer to users is necessary. Doing so will lead to an increase in costs and the number of NFs. Under such circumstances, the use of optimization strategies for the placement of NFs is crucial to offer Quality of Service (QoS) in a cost-effective manner. In this vein, this paper addresses the User Plane Functions Placement (UPFP) problem in 5G networks. The UPFP is modeled as a Mixed-Integer Linear Programming (MILP) problem aimed at determining the optimal number and location of User Plane Functions (UPFs). Two optimization models are proposed that considered various parameters, such as latency, reliability and user mobility. To evaluate their performance, two services under the Ultra-Reliable an Low-Latency Communication (URLLC) category were selected. The acquired results showcase the effectiveness of our solutions.Simplified probabilistic model for maximum traffic load from weigh-in-motion dataSoriano Ibáñez, MiguelCasas Rius, Joan RamonGhosn, Michelhttp://hdl.handle.net/2117/1682832020-07-23T21:39:25Z2019-09-16T22:43:19ZSimplified probabilistic model for maximum traffic load from weigh-in-motion data
Soriano Ibáñez, Miguel; Casas Rius, Joan Ramon; Ghosn, Michel
This paper reviews the simplified procedure proposed by Ghosn and Sivakumar to model the maximum expected traffic load effect on highway bridges and illustrates the methodology using a set of Weigh-In-Motion (WIM) data collected on one site in the U.S. The paper compares different approaches for implementing the procedure and explores the effects of limitations in the sitespecific data on the projected maximum live load effect for different bridge service lives. A sensitivity analysis is carried out on the most representative variables involved in the WIM data collection and calculation of the maximum load effect. The procedure is implemented on a set of WIM data collected in
Slovenia to study the maximum load effect on existing Slovenian highway bridges and how it compares with the values obtained from the Eurocode of actions.
2019-09-16T22:43:19ZSoriano Ibáñez, MiguelCasas Rius, Joan RamonGhosn, MichelThis paper reviews the simplified procedure proposed by Ghosn and Sivakumar to model the maximum expected traffic load effect on highway bridges and illustrates the methodology using a set of Weigh-In-Motion (WIM) data collected on one site in the U.S. The paper compares different approaches for implementing the procedure and explores the effects of limitations in the sitespecific data on the projected maximum live load effect for different bridge service lives. A sensitivity analysis is carried out on the most representative variables involved in the WIM data collection and calculation of the maximum load effect. The procedure is implemented on a set of WIM data collected in
Slovenia to study the maximum load effect on existing Slovenian highway bridges and how it compares with the values obtained from the Eurocode of actions.CIPSEC-Enhancing Critical Infrastructure Protection with Innovative Security FrameworkMarín Tordera, EvaMasip Bruin, XavierForné Muñoz, Jorgehttp://hdl.handle.net/2117/1669042020-07-23T23:12:11Z2019-07-26T08:53:08ZCIPSEC-Enhancing Critical Infrastructure Protection with Innovative Security Framework
Marín Tordera, Eva; Masip Bruin, Xavier; Forné Muñoz, Jorge
In the recent years, the majority of the world’s Critical Infrastructures (CIs)
have evolved to be more flexible, cost efficient and able to offer better
services and conditions for business growth. Through this evolution, CIs and
companies offering CI services had to adopt many of the recent advances
CIPSEC-Enhancing Critical Infrastructure Protection
of the Information and Communication Technologies (ICT) field. This rapid
adaptation however, was performed without thorough evaluation of its impact
on CIs’ security. It resulted into leaving CIs vulnerable to a new set of
threats and vulnerabilities that impose high levels of risk to the public safety,
economy and welfare of the population. To this extend, the main approach for
protecting CIs includes handling them as comprehensive entities and offer a
complete solution for their overall infrastructures and ICT systems (IT&OT
departments). However, complete CI security solutions exist, in the form of
individual products from IT security companies. These products, integrate
only in-house designed and developed tools/solutions, thus offering a limited
range of technical solutions.
The main aim of CIPSEC is to create a unified security framework that
orchestrates state-of-the-art heterogeneous security products to offer high
levels of protection in IT (information technology) and OT (operational
technology) departments of CIs, also offering a complete security ecosystem
of additional services. These services include vulnerability tests and
recommendations, key personnel training courses, public-private partnerships
(PPPs), forensics analysis, standardization activities and analysis against
cascading effects.
2019-07-26T08:53:08ZMarín Tordera, EvaMasip Bruin, XavierForné Muñoz, JorgeIn the recent years, the majority of the world’s Critical Infrastructures (CIs)
have evolved to be more flexible, cost efficient and able to offer better
services and conditions for business growth. Through this evolution, CIs and
companies offering CI services had to adopt many of the recent advances
CIPSEC-Enhancing Critical Infrastructure Protection
of the Information and Communication Technologies (ICT) field. This rapid
adaptation however, was performed without thorough evaluation of its impact
on CIs’ security. It resulted into leaving CIs vulnerable to a new set of
threats and vulnerabilities that impose high levels of risk to the public safety,
economy and welfare of the population. To this extend, the main approach for
protecting CIs includes handling them as comprehensive entities and offer a
complete solution for their overall infrastructures and ICT systems (IT&OT
departments). However, complete CI security solutions exist, in the form of
individual products from IT security companies. These products, integrate
only in-house designed and developed tools/solutions, thus offering a limited
range of technical solutions.
The main aim of CIPSEC is to create a unified security framework that
orchestrates state-of-the-art heterogeneous security products to offer high
levels of protection in IT (information technology) and OT (operational
technology) departments of CIs, also offering a complete security ecosystem
of additional services. These services include vulnerability tests and
recommendations, key personnel training courses, public-private partnerships
(PPPs), forensics analysis, standardization activities and analysis against
cascading effects.Software defined networks and data distribution service as key features for the 5G control planeLlorens Carrodeguas, AlejandroCervelló Pastor, CristinaLeyva Pupo, Irianhttp://hdl.handle.net/2117/1329362023-06-11T00:01:00Z2019-05-13T13:54:21ZSoftware defined networks and data distribution service as key features for the 5G control plane
Llorens Carrodeguas, Alejandro; Cervelló Pastor, Cristina; Leyva Pupo, Irian
The latency and flexible requirements of the 5G network are challenging telecommunication operators to have a more flexible, scalable, faster and programmable architecture. To solve this problem, this paper proposes a hybrid hierarchical set of Software Defined Networks (SDN) controllers as the control plane for 5G networks. The architecture is based on a federation of hierarchically-superior controllers which use Data Distribution Service (DDS) to communicate among each other and coordinate multiple sub-network controllers.
2019-05-13T13:54:21ZLlorens Carrodeguas, AlejandroCervelló Pastor, CristinaLeyva Pupo, IrianThe latency and flexible requirements of the 5G network are challenging telecommunication operators to have a more flexible, scalable, faster and programmable architecture. To solve this problem, this paper proposes a hybrid hierarchical set of Software Defined Networks (SDN) controllers as the control plane for 5G networks. The architecture is based on a federation of hierarchically-superior controllers which use Data Distribution Service (DDS) to communicate among each other and coordinate multiple sub-network controllers.An integrated SDN-based architecture for Passive Optical NetworksKhalili, HamzehRincón Rivera, DavidSallent Ribes, SebastiánPiney da Silva, José Ramónhttp://hdl.handle.net/2117/1253742020-07-23T22:36:09Z2018-12-04T13:09:59ZAn integrated SDN-based architecture for Passive Optical Networks
Khalili, Hamzeh; Rincón Rivera, David; Sallent Ribes, Sebastián; Piney da Silva, José Ramón
Passive Optical Network (PON) are often managed by non-flexible, proprietary network management systems. Software Defined Networking (SDN) opens the way for a more efficient operation and management of networks. We describe a new SDN-based architecture for Ethernet Passive Optical Networks (EPON), in which some functions of the Optical Line Terminal (OLT) are virtualized and located in an external controller, while keeping the rest of the PON functionality around an Open Flow switch. This opens the way for an improved management of the resource usage, bandwidth allocation, Quality-of-Service (QoS) monitoring and enforcement, or power consumption management, among other possibilities. In order to maintain the time-sensitive nature of the EPON operations, synchronous ports are added to the switch. OpenFlow messages are extended in order to cope with the PON-related parameters. Results based on simulations demonstrate that our proposal performs similarly or better than legacy architectures, in terms of delay and throughput.
2018-12-04T13:09:59ZKhalili, HamzehRincón Rivera, DavidSallent Ribes, SebastiánPiney da Silva, José RamónPassive Optical Network (PON) are often managed by non-flexible, proprietary network management systems. Software Defined Networking (SDN) opens the way for a more efficient operation and management of networks. We describe a new SDN-based architecture for Ethernet Passive Optical Networks (EPON), in which some functions of the Optical Line Terminal (OLT) are virtualized and located in an external controller, while keeping the rest of the PON functionality around an Open Flow switch. This opens the way for an improved management of the resource usage, bandwidth allocation, Quality-of-Service (QoS) monitoring and enforcement, or power consumption management, among other possibilities. In order to maintain the time-sensitive nature of the EPON operations, synchronous ports are added to the switch. OpenFlow messages are extended in order to cope with the PON-related parameters. Results based on simulations demonstrate that our proposal performs similarly or better than legacy architectures, in terms of delay and throughput.