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  • Game theoretic D2D content dissemination in 4G cellular networks

     Antonopoulos, Angelos; Kartsakli, Elli; Verikoukis, Christos
    IEEE communications magazine
    Vol. 52, num. 6, p. 125-132
    DOI: 10.1109/MCOM.2014.6829954
    Date of publication: 2014-06-01
    Journal article

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    The widespread proliferation of mobile devices has motivated Device-to-Device (D2D) communications as a means of cell offloading toward better Quality of Service (QoS) and higher energy efficiency. Although Wi-Fi networks have the lion's share regarding the D2D communications in the unlicensed spectrum, it is uncertain whether they constitute the best option as technology evolves. In particular, the increasing transmission data rates, the novel interference cancelation techniques, as well as the potential of centralized network support, stress the need for new Medium Access Control (MAC) protocols, especially in content dissemination scenarios where all nodes share the same goal. In this article we study the suitability of Wi-Fi technology in content dissemination scenarios with multiple available source nodes, and we propose two energy-aware game theoretic MAC strategies (a distributed and a network-assisted) as possible alternatives. Our simulation results show the effectiveness and the flexibility of our proposed solutions, highlighting the necessity for new MAC designs.

    The widespread proliferation of mobile devices has motivated Device-to-Device (D2D) communications as a means of cell offloading toward better Quality of Service (QoS) and higher energy efficiency. Although Wi-Fi networks have the lion's share regarding the D2D communications in the unlicensed spectrum, it is uncertain whether they constitute the best option as technology evolves. In particular, the increasing transmission data rates, the novel interference cancelation techniques, as well as the potential of centralized network support, stress the need for new Medium Access Control (MAC) protocols, especially in content dissemination scenarios where all nodes share the same goal. In this article we study the suitability of Wi-Fi technology in content dissemination scenarios with multiple available source nodes, and we propose two energy-aware game theoretic MAC strategies (a distributed and a network-assisted) as possible alternatives. Our simulation results show the effectiveness and the flexibility of our proposed solutions, highlighting the necessity for new MAC designs.

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    WSN4QoL: a WSN-oriented healthcare system architecture  Open access

     Tennina, Stefano; Di Renzo, Marco; Kartsakli, Elli; Graziosi, Fabio; Lalos, Aristeidis; Antonopoulos, Angelos; Mekikis, Prodromos Vasileios; Alonso Zárate, Luis Gonzaga
    International journal of distributed sensor networks
    Vol. 2014, p. 1-16
    DOI: 10.1155/2014/503417
    Date of publication: 2014-05-06
    Journal article

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    People worldwide are getting older and this fact has pushed the need for designing new, more pervasive, and possibly cost effective healthcare systems. In this field, distributed and networked embedded systems, such as wireless sensor networks (WSNs), are the most appealing technology to achieve continuous monitoring of aged people for their own safety, without affecting their daily activities. This paper proposes recent advancements in this field by introducing WSN4QoL, a Marie Curie project which involves academic and industrial partners from three EU countries. The project aims to propose new WSN-based technologies to meet the specific requirements of pervasive healthcare applications. In particular, in this paper, the system architecture is presented to cope with the challenges imposed by the specific application scenario. This includes a network coding (NC) mechanism and a distributed localization solution that have been implemented on WSN testbeds to achieve efficiency in the communications and to enable indoor people tracking. Preliminary results in a real environment show good system performance that meet our expectations.

    People worldwide are getting older and this fact has pushed the need for designing new, more pervasive, and possibly cost effective healthcare systems. In this field, distributed and networked embedded systems, such as wireless sensor networks (WSNs), are the most appealing technology to achieve continuous monitoring of aged people for their own safety, without affecting their daily activities. This paper proposes recent advancements in this field by introducing WSN4QoL, a Marie Curie project which involves academic and industrial partners from three EU countries. The project aims to propose new WSN-based technologies to meet the specific requirements of pervasive healthcare applications. In particular, in this paper, the system architecture is presented to cope with the challenges imposed by the specific application scenario. This includes a network coding (NC) mechanism and a distributed localization solution that have been implemented on WSN testbeds to achieve efficiency in the communications and to enable indoor people tracking. Preliminary results in a real environment show good system performance that meet our expectations.

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    A cloud-assisted random linear network coding medium access control protocol for healthcare applications  Open access

     Kartsakli, Elli; Antonopoulos, Angelos; Alonso Zárate, Luis Gonzaga; Verikoukis, Christos
    Sensors
    Vol. 14, num. 3, p. 4806-4830
    DOI: 10.3390/s140304806
    Date of publication: 2014-03
    Journal article

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    Relay sensor networks are often employed in end-to-end healthcare applications to facilitate the information flow between patient worn sensors and the medical data center. Medium access control (MAC) protocols, based on random linear network coding (RLNC), are a novel and suitable approach to efficiently handle data dissemination. However, several challenges arise, such as additional delays introduced by the intermediate relay nodes and decoding failures, due to channel errors. In this paper, we tackle these issues by adopting a cloud architecture where the set of relays is connected to a coordinating entity, called cloud manager. We propose a cloud-assisted RLNC-based MAC protocol (CLNC-MAC) and develop a mathematical model for the calculation of the key performance metrics, namely the system throughput, the mean completion time for data delivery and the energy efficiency. We show the importance of central coordination in fully exploiting the gain of RLNC under error-prone channels.

    Relay sensor networks are often employed in end-to-end healthcare applications to facilitate the information flow between patient worn sensors and the medical data center. Medium access control (MAC) protocols, based on random linear network coding (RLNC), are a novel and suitable approach to efficiently handle data dissemination. However, several challenges arise, such as additional delays introduced by the intermediate relay nodes and decoding failures, due to channel errors. In this paper, we tackle these issues by adopting a cloud architecture where the set of relays is connected to a coordinating entity, called cloud manager. We propose a cloud-assisted RLNC-based MAC protocol (CLNC-MAC) and develop a mathematical model for the calculation of the key performance metrics, namely the system throughput, the mean completion time for data delivery and the energy efficiency. We show the importance of central coordination in fully exploiting the gain of RLNC under error-prone channels.

  • Cross layer access point selection mechanisms for a distributed queuing MAC protocol

     Antonopoulos, Angelos; Kartsakli, Elli; Alonso Zárate, Luis Gonzaga; Verikoukis, Christos
    Telecommunications systems and services directory
    Vol. 53, num. 3, p. 329-342
    DOI: 10.1007/s11235-013-9701-6
    Date of publication: 2013-07
    Journal article

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    The Distributed Queuing with Collision Avoidance (DQCA) Medium Access Control (MAC) protocol has been presented in the literature as a high-performance protocol for WLANs. Previous work regarding DQCA is focused on the operation of a single cell, where no interaction with neighboring sites is considered. In this paper, we define specific handoff procedures (channel sensing, discovery and reassociation functions) that enable the roaming of users in a scenario consisting of several DQCA access points (APs) deployed in a specific area using non-overlapping channel frequencies. Furthermore, we introduce a number of AP selection mechanisms in order to provide efficient reassociation decision criteria in the context of DQCA. These mechanisms are based either on a single metric such as the Signal to Noise Ratio (SNR) or the traffic load, or on cross-layer design by combining the information fromThe Distributed Queuing with Collision Avoidance (DQCA) Medium Access Control (MAC) protocol has been presented in the literature as a high-performance protocol for WLANs. Previous work regarding DQCA is focused on the operation of a single cell, where no interaction with neighboring sites is considered. In this paper, we define specific handoff procedures (channel sensing, discovery and reassociation functions) that enable the roaming of users in a scenario consisting of several DQCA access points (APs) deployed in a specific area using non-overlapping channel frequencies. Furthermore, we introduce a number of AP selection mechanisms in order to provide efficient reassociation decision criteria in the context of DQCA. These mechanisms are based either on a single metric such as the Signal to Noise Ratio (SNR) or the traffic load, or on cross-layer design by combining the information from different layers. Finally, our proposed solutions are evaluated by means of computer simulations. different layers. Finally, our proposed solutions are evaluated by means of computer simulations.

    The Distributed Queuing with Collision Avoidance (DQCA) Medium Access Control (MAC) protocol has been presented in the literature as a high-performance protocol for WLANs. Previous work regarding DQCA is focused on the operation of a single cell, where no interaction with neighboring sites is considered. In this paper, we define specific handoff procedures (channel sensing, discovery and reassociation functions) that enable the roaming of users in a scenario consisting of several DQCA access points (APs) deployed in a specific area using non-overlapping channel frequencies. Furthermore, we introduce a number of AP selection mechanisms in order to provide efficient reassociation decision criteria in the context of DQCA. These mechanisms are based either on a single metric such as the Signal to Noise Ratio (SNR) or the traffic load, or on cross-layer design by combining the information from different layers. Finally, our proposed solutions are evaluated by means of computer simulations.

  • Enhancing quality of life with wireless sensor technology

     Kartsakli, Elli; Antonopoulos, Angelos; Tennina, Stefano; Lalos, Aristeidis; Mekikis, Prodromos Vasileios; Alonso Zárate, Luis Gonzaga; Graziosi, Fabio; Di Renzo, Marco; Verikoukis, Christos
    IEEE LifeSciences
    Date of publication: 2013-12
    Journal article

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    A co-operative project involving both industry and academia is designing an innovative Wireless Sensor Network for more effective healthcare of elders. The median age of the world population has shown a steady increase over the last 50 years, mainly due to the reduction of fertility and the 20-year increase in the average life expectancy. These factors, combined with the elevated birth rate observed in many countries during the decades following World War II, have led to a shift in the distribution of the population towards older ages in most regions of the planet. On the other hand, the average lifespan worldwide is expected to increase by 10 years by 2050.

    A co-operative project involving both industry and academia is designing an innovative Wireless Sensor Network for more effective healthcare of elders. The median age of the world population has shown a steady increase over the last 50 years, mainly due to the reduction of fertility and the 20-year increase in the average life expectancy. These factors, combined with the elevated birth rate observed in many countries during the decades following World War II, have led to a shift in the distribution of the population towards older ages in most regions of the planet. On the other hand, the average lifespan worldwide is expected to increase by 10 years by 2050.

    Postprint (author’s final draft)

  • Energy Efficient Schemes for Base Station Management in 4G Broadband Systems

     Bousia, Alexandra; Kartsakli, Elli; Antonopoulos, Angelos; Alonso Zárate, Luis Gonzaga; Verikoukis, Christos
    DOI: 10.4018/978-1-4666-4888-3
    Date of publication: 2013-12
    Book chapter

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    Multiuser MAC schemes for high-throughput IEEE 802.11n/ac WLANs  Open access

     Kartsakli, Elli; Zorba Barah, Nizar; Alonso Zárate, Luis Gonzaga; Verikoukis, Christos
    DOI: 10.5772/57129
    Date of publication: 2013-12
    Book chapter

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    In the last decade, the Wireless Local Area Network (WLAN) market has been experiencing an impressive growth that began with the broad acceptance of the IEEE 802.11 standard [1]. Given the widespread deployment of WLANs and the increasing requirements of multimedia applications, the need for high capacity and enhanced reliability has become imperative. Multiple-Input Multiple-Output (MIMO) technology and its single receiving antenna version, MISO (Multiple-Input Single-Output (MISO), promise a signi¿cant performance boost and have been incorporated in the emerging IEEE 802.11n standard.

    In the last decade, the Wireless Local Area Network (WLAN) market has been experiencing an impressive growth that began with the broad acceptance of the IEEE 802.11 standard [1]. Given the widespread deployment of WLANs and the increasing requirements of multimedia applications, the need for high capacity and enhanced reliability has become imperative. Multiple-Input Multiple-Output (MIMO) technology and its single receiving antenna version, MISO (Multiple-Input Single-Output (MISO), promise a signi¿cant performance boost and have been incorporated in the emerging IEEE 802.11n standard.

  • 2013 EURASIP Best Paper Award for the Journal on Advances in Signal Processing

     Alonso Zárate, Luis Gonzaga; Kartsakli, Elli; Verikoukis, Christos; Alonso, L.
    Award or recognition

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  • WSN4QoL: Wireless Sensor Networks for Quality of Life

     Tennina, Stefano; Kartsakli, Elli; Lalos, Aristeidis; Antonopoulos, Angelos; Mekikis, Prodromos Vasileios; Di Renzo, Marco; Zacchia Lun, Yuriy; Graziosi, Fabio; Alonso Zárate, Luis Gonzaga; Verikoukis, Christos
    IEEE International Conference on e-Health Networking, Applications and Services
    p. 277-279
    DOI: 10.1109/HealthCom.2013.6720683
    Presentation's date: 2013-10-09
    Presentation of work at congresses

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    Life expectancy is projected to increase significantly in the coming years. This fact has pushed the need for designing new and more pervasive healthcare systems. In this field, distributed and networked embedded systems, such as Wireless Sensor Networks (WSNs), are the most suitable technology to achieve continuous monitoring of aged people for their own safety, without affecting their daily activities. This paper proposes recent advancements in this field by introducing WSN4QoL, a Marie Curie project which involves academic and industrial partners from three EU countries. The project aims to propose new WSN-based technologies to meet the specific requirements of pervasive healthcare applications. In particular, in this paper, a Network Coding (NC) mechanism and a distributed localization solution are presented. They have been implemented on WSN testbeds to achieve efficiency in the communications and to enable indoor people tracking. Preliminary results in a real environment show good system performance that meet our expectations.

  • Game theoretic approach for switching off base stations in multi-operator environments

     Bousia, Alexandra; Kartsakli, Elli; Antonopoulos, Angelos; Alonso Zárate, Luis Gonzaga; Verikoukis, Christos
    IEEE International Conference on Communications
    p. 4420-4424
    DOI: 10.1109/ICC.2013.6655262
    Presentation's date: 2013-06-09
    Presentation of work at congresses

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    The emerging increase of the number of Base Stations causes redundant energy consumption, especially during low traffic periods, when the Base Stations capacity is underutilized. In this paper, we study energy efficiency issues in multi-operator mobile networks. Our primary goal is to save energy, without compromising the offered Quality of Service, by switching off the excessive Base Stations. To this end, we propose a novel game theoretic strategy using cost-based functions to decide the best suitable Base Stations to remain active. Mathematical analysis and simulations demonstrate that the proposed scheme can significantly reduce the energy consumption.

    The emerging increase of the number of Base Stations causes redundant energy consumption, especially during low traffic periods, when the Base Stations capacity is underutilized. In this paper, we study energy efficiency issues in multi-operator mobile networks. Our primary goal is to save energy, without compromising the offered Quality of Service, by switching off the excessive Base Stations. To this end, we propose a novel game theoretic strategy using cost-based functions to decide the best suitable Base Stations to remain active. Mathematical analysis and simulations demonstrate that the proposed scheme can significantly reduce the energy consumption.

  • Energy efficient techniques for 802.11n multiuser MAC WLANs

     Gajic, Danica; Kartsakli, Elli; Zorba Barah, Nizar; Liß, Christian; Alonso Zárate, Luis Gonzaga; Verikoukis, Christos
    IEEE International Conference on Communications
    p. 3655-3659
    DOI: 10.1109/ICC.2013.6655121
    Presentation's date: 2013-06-09
    Presentation of work at congresses

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    In this paper we evaluate the energy efficiency of MIMO technologies introduced in the emerging IEEE 802.11n standard for infrastructure based WLANs. The main focus is on exploiting multiuser capabilities of MIMO technologies, while studying the proper design of multiuser MAC schemes to achieve an energy efficient solution. Three different multiuser MAC schemes are presented and analyzed. Analytical models for energy efficiency are mathematically developed and verified with link-level computer simulations. The results show the feasibility of achieving higher energy efficiency with the proper adjustment of the system parameters, and without significant degradation of throughput performance.

    In this paper we evaluate the energy efficiency of MIMO technologies introduced in the emerging IEEE 802.11n standard for infrastructure based WLANs. The main focus is on exploiting multiuser capabilities of MIMO technologies, while studying the proper design of multiuser MAC schemes to achieve an energy efficient solution. Three different multiuser MAC schemes are presented and analyzed. Analytical models for energy efficiency are mathematically developed and verified with link-level computer simulations. The results show the feasibility of achieving higher energy efficiency with the proper adjustment of the system parameters, and without significant degradation of throughput performance.

  • Experimental study of bluetooth, ZigBee and IEEE 802.15.4 technologies on board high-speed trains

     Higuera, Jorge; Kartsakli, Elli; Valenzuela Gonzalez, Jose Luis; Alonso Zárate, Luis Gonzaga; Laya Romero, Andres Ernesto; Martínez, Raquel; Aguilar, Alicia
    IEEE Vehicular Technology Conference
    p. 1-5
    DOI: 10.1109/VETECS.2012.6239971
    Date of publication: 2012
    Journal article

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    This paper studies the feasibility of using low-power wireless technologies such as Bluetooth, IEEE 802.15.4 and ZigBee in high-speed railway scenarios that involve bidirectional ground-to-train communication. The presented results have been obtained through experimental tests conducted at the Madrid- Barcelona high-speed rail line. A multiplatform communication system has been installed in a high-speed train, circulating at velocities up to 300 km/h, whereas autonomous devices have been disseminated along of the railway path to communicate with the onboard devices. The conclusions drawn from this work will be used as guidelines for the future implementation of autonomous communication platforms for high-speed rail connectivity.

  • Energy efficient base station maximization switch off scheme for LTE-advanced

     Bousia, Alexandra; Kartsakli, Elli; Alonso Zárate, Luis Gonzaga; Verikoukis, Christos
    IEEE International Workshop on Computer-Aided Modeling Analysis and Design of Communication Links and Networks
    p. 256-260
    DOI: 10.1109/CAMAD.2012.6335345
    Presentation's date: 2012-09
    Presentation of work at congresses

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    In this paper, we introduce a solution to a maximization problem for switching off Base Stations in an LTE-Advanced wireless network. Our scheme exploits the existence of idle periods in a cellular network during ¿night zone¿, when the traffic load is low. This work focuses on finding the optimal combination of switched on and off Bases Stations leading to the maximum energy saving. In addition, the major goal lies on increasing the energy efficiency by optimizing the power utilization of the Base Stations without sacrificing the offered Quality of Service. The proposed solution achieves significant energy saving and its performance is evaluated by means of analytical model, as well as simulations results.

  • Dynamic energy efficient distance-aware base station switch on/off scheme for LTE-advanced

     Kartsakli, Elli; Bousia, Alexandra; Alonso Zárate, Luis Gonzaga; Verikoukis, Christos
    IEEE Global Communications Conference
    p. 1532-1537
    DOI: 10.1109/GLOCOM.2012.6503331
    Presentation of work at congresses

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    Reducing the energy consumption in wireless networks has become a significant problem, not only because of its great impact on the global energy crisis, but also because it represents a noteworthy cost for telecommunication operators. The Base Stations (BSs), constituting the main component of wireless infrastructure, are intended to serve their customers during peak time periods. On the other hand, they are more than sufficient when the traffic load is low. Our paper proposes a solution for the problem of inefficient use by using a dynamic BSs switch on/off algorithm. We demonstrate via analysis and simulations that we can achieve significant reduction in energy consumption when we dynamically switch off the unnecessary BSs depending on the traffic variations and the distance between the User Equipments (UEs) and their associated BS. While maintaining the Quality of Service (QoS), we calculate the maximum number of BSs that can be switched off considering the time varying characteristic of the traffic pattern.

  • Experimental study of Bluetooth, ZigBee and IEEE 802.15.4 technologies on board high-speed trains

     Higuera, Jorge; Kartsakli, Elli; Valenzuela Gonzalez, Jose Luis; Alonso Zárate, Luis Gonzaga; Laya Romero, Andres Ernesto; Martínez, Raquel; Aguilar, Alicia
    IEEE Vehicular Technology Conference
    p. 1-5
    DOI: 10.1109/VETECS.2012.6239971
    Presentation's date: 2012-05
    Presentation of work at congresses

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    This paper studies the feasibility of using low-power wireless technologies such as Bluetooth, IEEE 802.15.4 and ZigBee in high-speed railway scenarios that involve bidirectional ground-to-train communication. The presented results have been obtained through experimental tests conducted at the Madrid-Barcelona high-speed rail line. A multiplatform communication system has been installed in a high-speed train, circulating at velocities up to 300 km/h, whereas autonomous devices have been disseminated along of the railway path to communicate with the onboard devices. The conclusions drawn from this work will be used as guidelines for the future implementation of autonomous communication platforms for high-speed rail connectivity.

    This paper studies the feasibility of using low-power wireless technologies such as Bluetooth, IEEE 802.15.4 and ZigBee in high-speed railway scenarios that involve bidirectional ground-to-train communication. The presented results have been obtained through experimental tests conducted at the Madrid-Barcelona high-speed rail line. A multiplatform communication system has been installed in a high-speed train, circulating at velocities up to 300 km/h, whereas autonomous devices have been disseminated along of the railway path to communicate with the onboard devices. The conclusions drawn from this work will be used as guidelines for the future implementation of autonomous communication platforms for high-speed rail connectivity.

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    A threshold-selective multiuser downlink MAC scheme for 802.11n wireless networks  Open access

     Kartsakli, Elli; Zorba Barah, Nizar; Alonso Zárate, Luis Gonzaga; Verikoukis, Christos
    IEEE transactions on wireless communications
    Vol. 10, num. 3, p. 857-867
    DOI: 10.1109/TWC.2011.010411.100266
    Date of publication: 2011-03
    Journal article

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    Multi-radio cooperative ARQ in wireless cellular networks: a MAC layer perspective  Open access

     Kartsakli, Elli; Katz, Marcos; Alonso Zárate, Luis Gonzaga; Verikoukis, Christos
    Telecommunication systems
    p. 1-11
    DOI: 10.1007/s11235-011-9449-9
    Date of publication: 2011-05
    Journal article

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    Multi-Radio Cooperative Automatic Retransmission Request (MCARQ) schemes are introduced in this paper within the context of hybrid networks which combine long-range and short-range communications. Since the number of wireless devices is incessantly increasing, it is frequently possible to establish a spontaneous cooperative cluster in the close proximity of any wireless device. These devices forming the cluster are connected to both a cellular-based network such as WiMAX, 3G, or LTE and a short-range network based on technologies such as WLAN, Zigbee, Bluetooh, or UWB, among other possibilities. The main idea behind the proposed MC-ARQ scheme is that, upon transmission error through the cellular interface, retransmission can be requested to the wireless grid surrounding the destination device using the short-range interface instead of the primary cellular link. Therefore, besides the cooperative diversity attained with CARQ schemes, the traffic load in the cellular interface is reduced benefiting thus a high number of users and reducing both energy consumption and interference. The Persistent Relay Carrier Sensing Medium Access (PRCSMA) protocol is presented as an example of solution for the MAC layer in this emerging new topic.

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    Dealing with VoIP calls during `busy hour¿ in LTE  Open access

     Antonopoulos, Angelos; Kartsakli, Elli; Alonso Zárate, Luis Gonzaga; Verikoukis, Christos
    DOI: 10.5772/20875
    Date of publication: 2011
    Book chapter

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  • MAC protocols with cross-layer design

     Kartsakli, Elli; Antonopoulos, Angelos; Alonso Zárate, Luis Gonzaga
    Date of publication: 2011-11-01
    Book chapter

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  • Premio a la mejor ponencia en WSN de las 5º Jornadas Científicas sobre RFID

     Alonso Zárate, Luis Gonzaga; Valenzuela Gonzalez, Jose Luis; Kartsakli, Elli; Higuera Portilla, Jorge Eduardo
    Award or recognition

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  • An early stage training network in enabling technologies for GREEN radio

     Valenzuela Gonzalez, Jose Luis; Ruiz Boque, Silvia; Olmos Bonafé, Juan José; Kartsakli, Elli; Laya Romero, Andres Ernesto; Garcia Lozano, Mario; Collado Gomez, Juan Carlos; Alonso Zárate, Luis Gonzaga; Pérez Diaz de Cerio, David
    Competitive project

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  • On the feasibility of Bluetooth, Zigbee and IEEE 802.15.4 technologies on board high speed trains

     Higuera Portilla, Jorge Eduardo; Kartsakli, Elli; Valenzuela Gonzalez, Jose Luis; Alonso Zárate, Luis Gonzaga
    Jornadas Científicas sobre RFID
    p. 37-42
    Presentation's date: 2011-11-09
    Presentation of work at congresses

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  • Secure Location-Aware Cooperative Network-Coded WSNs for better Quality of Life

     Kartsakli, Elli; Laya Romero, Andres Ernesto; Alonso Zárate, Luis Gonzaga
    Competitive project

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  • An experimental study of multi-radio platform coexistence in the 5 GHz band for railway applications

     Higuera Portilla, Jorge Eduardo; Kartsakli, Elli; Collado Gomez, Juan Carlos; González Arbesú, José María; Alonso Zárate, Luis Gonzaga; Valenzuela Gonzalez, Jose Luis; Laya Romero, Andres Ernesto; Flores, Enrique; Navarro, Isabel; Martinez, R.; González, Jesús; Hierro, José; Vlad, Adrián
    International Workshop on Communication Technologies for Vehicles
    p. 11-22
    DOI: 10.1007/978-3-642-19786-4_2
    Presentation's date: 2011-03
    Presentation of work at congresses

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    This paper studies the practical challenges that arise due to the coexistence of two wireless technologies, both operating in the license-exempt 5 GHz band. In particular, WiFi and WiMAX equipment have been used in the experiments. The mutual interference caused by the two technologies operating in different but narrowly separated frequency channels has a negative impact on the performance of both systems. Further challenges are introduced when the two systems are in close physical proximity of each other or, in a more extreme scenario, share the same antenna as could be required in railway applications. This paper investigates these issues through a series of experimental tests based on a multi-radio platform testbed. The conclusions drawn from this study will be used as a base for the implementation of a multi-radio platform to provide communications between train and land in both directions in the context of the Spanish high-speed railway system.

  • An experimental study of multi-radio platform coexistence in the 5 GHz band for railway applications

     Higuera Portilla, Jorge Eduardo; Kartsakli, Elli; Collado Gomez, Juan Carlos; González Arbesú, José María; Alonso Zárate, Luis Gonzaga; Valenzuela Gonzalez, Jose Luis; Laya Romero, Andres Ernesto; Flores, Enrique; Navarro, Isabel; Martínez, Raquel; González, Jesús; Hierro, José; Vlad, Adrián
    Date of publication: 2011-03
    Book chapter

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  • An Experimental Study of Multi-radio Platform Coexistence in the 5 GHz Band for Railway Applications

     Higuera Portilla, Jorge Eduardo; Kartsakli, Elli; Collado Gomez, Juan Carlos; González Arbesú, José María; Alonso Zárate, Luis Gonzaga; Valenzuela Gonzalez, Jose Luis; Laya Romero, Andres Ernesto; Flores, Enrique; Navarro, Isabel; Martínez, Raquel
    DOI: 10.1007/978-3-642-19786-4
    Date of publication: 2011
    Book chapter

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    Performance analysis of a cluster-based MAC protocol for wireless ad hoc networks  Open access

     Kartsakli, Elli; Alonso Zárate, Luis Gonzaga; Verikoukis, Christos
    Eurasip journal on wireless communication and networking
    Vol. 2010, num. Article ID 625619, p. 1-16
    DOI: 10.1155/2010/625619
    Date of publication: 2010
    Journal article

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  • Organización de international conference on mobile lightweight wireless systems: MOBILIGHT 2010

     Kartsakli, Elli; Laya Romero, Andres Ernesto; Alonso Zárate, Luis Gonzaga
    Competitive project

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    Coexistence of a novel medium access control protocol for wireless ad hoc networks and the IEEE 802.11  Open access

     Kartsakli, Elli; Alonso Zárate, Luis Gonzaga; Verikoukis, Christos
    IEEE International Conference on Communications
    Presentation's date: 2010-05-24
    Presentation of work at congresses

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  • Cross-layer scheduling with QoS support over a near-optimum distributed queueing protocol for wireless LANS

     Kartsakli, Elli; Alonso Zárate, Luis Gonzaga; Verikoukis, Christos
    DOI: 10.4018/978-1-61520-771-8.ch002
    Date of publication: 2010-03
    Book chapter

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  • Access to the full text
    Cooperative ARQ: a medium access control (MAC) layer perspective  Open access

     Kartsakli, Elli; Alonso Zárate, Luis Gonzaga; Verikoukis, Christos
    Date of publication: 2010
    Book chapter

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    A threshold-selective multiuser downlink MAC scheme for 802.11n wireless networks  Open access

     Kartsakli, Elli; Zorba Barah, Nizar; Alonso Zárate, Luis Gonzaga; Verikoukis, Christos
    IEEE International Conference on Communications
    p. 1-5
    DOI: 10.1109/ICC.2010.5502636
    Presentation's date: 2010-05-24
    Presentation of work at congresses

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  • Performance analysis of the distributed queuing collision avoidance (DQCA) protocol with link adaptation

     Kartsakli, Elli; Verikoukis, Christos; Alonso Zárate, Luis Gonzaga
    IEEE transactions on wireless communications
    Vol. 8, num. 2, p. 644-647
    DOI: 10.1109/TWC.2009.071342
    Date of publication: 2009-02
    Journal article

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  • INGENIERIA Y OPTIMIZACION DE RED CELULAR EN LONG TERM EVOLUTION DE 3GPP

     Ruiz Boque, Silvia; Garcia Lozano, Mario; Alonso Zárate, Luis Gonzaga; Kartsakli, Elli; González González, David; Lema Rosas, Maria Angel; Olmos Bonafé, Juan José
    Competitive project

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  • 2009SGR-1473 GRUP DE RECERCA EN TECNOLOGIES I COMUNICACIONS SENSE FILS, WICOMTEC

     Ruiz Boque, Silvia; Olmos Bonafé, Juan José; Garcia Lozano, Mario; Valenzuela Gonzalez, Jose Luis; Alonso Zárate, Luis Gonzaga; Pérez Diaz de Cerio, David; Kartsakli, Elli; Upadhyay, Gaurav; González González, David
    Competitive project

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  • P26/08, Diseño y validación de una multiplataforma de comunicaciones inalámbricas para mejorar la seguridad en el AVE

     Valenzuela Gonzalez, Jose Luis; Alonso Zárate, Luis Gonzaga; Kartsakli, Elli; Collado Gomez, Juan Carlos
    Competitive project

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    Handoff functions for a distributed queuing collision avoidance medium access control protocol for wireless LANs  Open access

     Alonso Zárate, Luis Gonzaga; Kartsakli, Elli; Antonopoulos, Angelos; Verikoukis, Christos
    Workshop on Wireless and Optical Networks
    p. 1-5
    DOI: 10.1109/ICUMT.2009.5345513
    Presentation's date: 2009-10
    Presentation of work at congresses

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  • QoS guarantee for wireless LAN with heterogeneous traffic

     Alonso Zárate, Luis Gonzaga; Kartsakli, Elli; Alonso, Jesus; Verikoukis, Christos
    ICT Mobile and Wireless Communications Summit
    Presentation's date: 2009-06
    Presentation of work at congresses

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  • Contention-based collision-resolution medium access control algorithms

     Kartsakli, Elli; Cateura Díaz, Alex; Alonso Zárate, Luis Gonzaga; Verikoukis, Christos
    Date of publication: 2009
    Book

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  • Cross-layer enhancement for WLAN systems with heterogeneous traffic based on DQCA

     Kartsakli, Elli; Alonso Zárate, Luis Gonzaga; Verikoukis, Christos
    IEEE communications magazine
    Vol. 46, num. 6, p. 60-66
    DOI: 10.1109/MCOM.2008.4539467
    Date of publication: 2008-06
    Journal article

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  • Persistent RCSMA: a MAC protocol for a distributed cooperative ARQ scheme in wireless networks

     Alonso Zárate, Luis Gonzaga; Kartsakli, Elli; Verikoukis, Christos
    Eurasip journal on advances in signal processing
    Vol. 2008, num. 10.1155/20, p. 1-13
    Date of publication: 2008-10
    Journal article

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  • Saturation throughput analysis of a cluster-based medium access control protocol for Ad Hoc wireless networks

     Alonso Zárate, Luis Gonzaga; Skianis, C H; Kartsakli, Elli; Verikoukis, Christos
    Simulation. Transactions of the Society for Modeling and Simulation International
    Vol. 84, num. 12, p. 619-633
    DOI: 10.1177/0037549708099232
    Date of publication: 2008-12
    Journal article

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  • Cross-layer scheduling with QoS support over a distributed queuing MAC for wireless LANs

     Kartsakli, Elli; Alonso Zárate, Luis Gonzaga; Verikoukis, Christos
    Mobile networks and applications
    p. 1-16
    DOI: 10.1007/s11036-008-0128-3
    Date of publication: 2008-11
    Journal article

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  • A near-optimum cross-layered distributed queuing protocol for wireless LAN

     Alonso Zárate, Luis Gonzaga; Verikoukis, Christos; Kartsakli, Elli; Cateura, C
    IEEE Wireless communications
    Vol. 15, num. 1, p. 48-55
    DOI: 10.1109/MWC.2008.4454704
    Date of publication: 2008-02
    Journal article

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  • People-218163-COOLNESS Coord

     Alonso Zárate, Luis Gonzaga; Kartsakli, Elli; Laya Romero, Andres Ernesto; Collado Gomez, Juan Carlos
    Competitive project

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  • Performance evaluation of a medium access control protocol for a distributed ARQ scheme in cooperative wireless networks

     Alonso Zárate, Luis Gonzaga; Giotis, P; Kartsakli, Elli; Verikoukis, Christos
    ICT'08, IEEE 15th International Conference on Telecommunications
    p. 1-5
    Presentation of work at congresses

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  • Throughput analysis of a medium access control protocol for a distributed cooperative ARQ scheme in wireless networks

     Alonso Zárate, Luis Gonzaga; Kartsakli, Elli; Verikoukis, Christos
    IEEE Global Comunications Conference 2008.
    p. 1-5
    Presentation of work at congresses

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  • Saturation Throughput Analysis of a Passive Cluster-based Medium Access Control Protocol for Ad Hoc Wireless Networks

     Alonso Zárate, Luis Gonzaga; Kartsakli, Elli; Cateura, A; Verikoukis, Christos
    IEEE International Conference on Communications
    p. 2625-2631
    Presentation of work at congresses

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  • Saturation throughput analysis of a passive cluster-based medium access control protocol for ad hoc wireless networks

     Alonso Zárate, Luis Gonzaga; Kartsakli, Elli; Cateura Díaz, Alex; Verikoukis, Christos
    IEEE International Conference on Communications
    DOI: 10.1109/ICC.2008.447
    Presentation's date: 2008-05
    Presentation of work at congresses

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  • A novel near-optimum medium acces control protocol for a distributed cooperative ARQ scheme in wireless networks

     Alonso Zárate, Luis Gonzaga; Kartsakli, Elli; Verikoukis, Christos
    IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC 2008)
    p. 1
    Presentation's date: 2008-09-15
    Presentation of work at congresses

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