Publications

On the implementation of Relay Selection Strategies for a Cooperative Diamond Network

Authors: Apostolos Apostolaras, Kostas Choumas, Ilias Syrigos, Iordanis Koutsopoulos, Thanasis Korakis, Antonios Argyriou and Leandros Tassiulas

Conference:  PIMRC, London, September 8-11 2013

Abstract: In this paper, we present an implementation design of a TDMA protocol for the canonical diamond-topology network containing a source, two relays and a destination (single unicast session). Getting inspired by the established Lyapunov methodology, we propose an online strategy for the relay selection/scheduling problem. In contrast to existing works, we implement this strategy inside the proposed TDMA protocol in order to operate over a CSMA enabled Wi-Fi infrastructureless network. We elaborate a network controller within the TDMA frame to solve a global optimization problem at each time slot in a centralized manner. In our formulation, we consider the class of scheduling policies that select concurrently a noninterfering subset of links. Our architecture is tailored to achieve the objectives of stabilizing the network and either maximizing throughput or minimizing the total power consumption. Our scheme has been implemented and tested thoroughly through experimentation in the NITOS wireless testbed by exploiting WiFi technology features. The results revealed significant increase in networking efficiency for throughput maximization.

Download paper: PIMRC2013Apostolaras.pdf

A Demonstration of a Relaying Selection Scheme for Maximizing A Diamond Network's Throughput

Authors: Apostolos Apostolaras, Ilias Syrigos, Giannis Kazdaridis, Thanasis Korakis, Iordanis Koutsopoulos, Antonios Argyriou and Leandros Tassiulas

Conference: TridentCom, Thessaloniki, Greece, June 2012

Abstract: We demonstrate a queue-aware algorithm studied in a diamond network topology. This algorithm's decisions are obtained from an analytical optimization framework relying on our technical work [4] and and we devise an implementation part by modifying the features of ath9k driver [3]. Performance evaluation is conducted through experimentation on the NITOS Wireless Testbed and it reveals a signi cant rise in total throughput considering a particular networking scenario while also it maintains stability of backlog queues when schedules indicated by Lyapunov-based technique as throughput optimal are selected.

Download paper: Relaying selection scheme.pdf

Integrating FlowVisor access control in a publicly available OpenFlow testbed with slicing support

Authors: Dimitris Giatsios, Kostas Choumas, Dimitris Syrivelis, Thanasis Korakis and Leandros Tassiulas

Conference: TridentCom, Thessaloniki, Greece, June 2012

Abstract: OpenFlow technology has recently attracted a lot of attention in the networking research community, as the ability to control the forwarding plane of a switch through software opens new exciting capabilities for protocol designers. Several network testbeds have added OpenFlow-capable switches to their equipment, while at the same time new OpenFlow-centric testbeds have been created. This demo describes a proposed approach to provide testbed slicing in a publicly available testbed featuring OpenFlow switching equipment. The approach leverages the slicing features of the FlowVisor software component and combines them with the NITOS Scheduler resource reservation framework. The resulting con guration was implemented and successfully integrated into the software framework of the publicly available testbed NITOS.

Download paper: Integrating FlowVisor access control in a publicly available OpenFlow testbed with slicing support.pdf

Cross-testbed experimentation using the Planetlab-NITOS federation

Authors: Nikos Makris, Stratos Keranidis, Dimitris Giatsios, Thanasis Korakis, Iordanis Koutsopoulos and Leandros Tassiulas

Conference: TridentCom 2012, Thessaloniki, Greece, June 2012

Abstract: Federation of network testbeds has been identi ed as a key goal in the experimental testbeds community, leading to a recent activity burst in this research eld. In this demo, we describe a federated exper- iment between the NITOS wireless testbed and the Planetlab Europe (PLE) testbed. The federation scheme supporting this experiment was initially established during the Onelab2 EU project and was enhanced during the OpenLab EU project. The experiment constitutes in test- ing the implementation of an end-to-end delay aware Wi-Fi association scheme, in an environment where a wireless station situated at NITOS is sending tra c towards a remote PLE server.

Download paper: Planetlab NITOS federation.pdf

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