Publications

A New Slicing Scheme for Efficient Use of Wireless Testbeds

Authors: Angelos-Christos Anadiotis, Apostolos Apostolaras, Dimitris Syrivelis, Thanasis Korakis, Leandros Tassiulas, Luis Rodriguez and Max Ott.

Conference: WiNTECH, Beijing, China, September 2009

The gradually growing need for testbed use so as networking algorithms to be validated in real environments, has given rise to optimal utilization of testbed resources. Despite the fact that, many laboratories around the globe have deployed testbeds, so as experimenters have the opportunity to test their algorithms, the majority of those testbeds su er from bad management that prevents users from e ciently exploiting testbed's resources. Moreover, as the number of testbed users increases, experimenters needs for more sophisticated allocation of testbed resources are growing. Toward, this direction, we propose a managerial framework that exploits testbed utilization by introducing slicing over frequency spectrum. This new framework will allow a more sophisticated way to optimally control and manage network resources of a testbed.

Download paper: wintech09_demo_uth.pdf

A Slicing Scheme for Efficient Use of Testbed’s Resources

Authors: Angelos-Christos Anadiotis, Apostolos Apostolaras, Dimitris Syrivelis, Thanasis Korakis  and Leandros Tassiulas

Conference: MobiCom 2009, Beijing, China, September 2009

The gradually growing need for testbed use so as networking algorithms to be validated in real environments, has given rise to optimal utilization of testbed resources. Despite the fact that, many laboratories around the globe have deployed testbeds, so as experimenters have the opportunity to test their algorithms, the majority of those testbeds suffer from bad management that prevents users from efficiently exploiting testbed’s resources. Moreover, as the number of testbed users increases, experimenters needs for more sophisticated allocation of testbed resources are growing. Toward, this direction, we propose a managerial framework that exploits testbed utilization by introducing slicing over frequency spectrum. This new framework will allow a more sophisticated way to optimally control and manage network resources of a testbed.

Keywords: Slicing, Network Virtualization, Wireless Testbed Framework

Download paper: mobiCom09_demo_uth.pdf

Cooperative Multicast Resource Allocation Strategy

Authors: Mahmoud Hadef, Apostolos Apostolaras, Jim O'Reilly, Alaiin Mourad and Belkacem Mouhouche

Conference: WCNC 2014, Instanbul, Turkey, 6 - 9 April 2014

In this paper we propose a new cooperative video multicast strategy, the so called Coordinated multiple relays (CoMR). This is based on an efficient one–to-many resource sharing technique which exploits the space diversity of the base station to relay to mobile station in a two hop topology. The new scheme showed  considerable enhancement of system average throughput and user fairness compared to non cooperative schemes and in addition, from an energy efficiency perspective due mainly to: a) the significant gain in terms of coverage provided by relay deployment, b) the positive superposition of synchronous transmissions at the access stage which boost the received Signal to Interference and Noise Ratios which ultimately allows the use of higher Modulation and Coding Schemes, c) The flexibility of the proposed algorithm to switch from  cooperative mode to non cooperative mode according to when the conditions are most beneficial.

Keywords — Cooperative communication, multicast scheduling, two hop network, coordinated transmission, WiMAX, and LTE.

Download paper: Coordinated Multiple Relays.pdf

Energy Aware Buffer Aided Cooperative Relay Selection

Authors: Mahmoud Hadef, Apostolos Apostolaras, Jim O’Reilly, Alain Mourad, Belkacem Mouhouche, Iordanis Koutsopoulos, Thanasis Korakis and Leandros Tassiulas

Conference: WCNC, Instanbul, Turkey, 6 - 9 April 2014

In this paper we evaluate an energy aware relay selection mechanism which exploits channel state information and the availability of buffers at relays to perform flexible relaying based on a back-pressure driven optimization model. This model ensured maximization of the cell throughput while maintaining the stability of backlog queues. Performance evaluation is conducted using a System Level Simulator which is fully compliant with IEEE 802.16m and supports various relaying scenarios. The Below Roof Top (BRT) relaying scenario is considered in this work. A holistic and flexible energy framework is implemented to capture the energy consumption of the cellular network nodes. The model maps the RF output power radiated at the antenna elements of each node including relays on the network to the total supply power of the node equipment. Two derivatives of the proposed mechanisms, half duplex and full duplex are proposed and evaluated. Results of the two derivatives on BRT relaying scenario revealed noticeable increases for both cell throughput and system energy efficiency of the cell-edge users compared to conventional relaying protocols and non cooperative scheme.

Keywords – relay, two hop network, energy efficiency, energy aware, relay selection, buffer-aided, throughput, WiMAX and LTE.

Download paper: bare_conf_wcnc_v4.pdf