Authors: Mahmoud Hadef, Apostolos Apostolaras, Alain Mourad, Jim Oreilly, Iordanis Koutsopoulos, and Leandros Tassiulas

Conference:  EMUTools – 1st Workshop on Emulation Tools, Methodology and Techniques, Cannes, French Riviera, March 5-7 2013

This paper proposes an energy efficient buffer-level aided relay selection mechanism for mobile communication networks that is based on the back-pressure algorithm. The mechanism exploits channel state information and the availability of buffers at the relays to perform dynamic relay selection based on an analytical framework derived from a Lyapunov optimization. The latter ensures a maximization of the cell throughput while preserving the stability of backlog queues. Performance evaluation is conducted using a WiMAX System Level Simulator compliant with IEEE 802.16m standard and supports various relaying scenarios. In order to represent the system energy efficiency of the whole WiMAX system, a sophisticated and holistic energy consumption model that maps the RF output power radiated at the antenna elements of each node on the network to the total supply power of the node equipment is implemented. Two derivatives of the proposed mechanism for half duplex and full duplex systems are proposed and evaluated. Preliminary results on the Above Roof Top relaying scenario reveal a noticeable increase on both cell throughput and system energy efficiency, in terms of joules per bit, compared to conventional relaying protocols.

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Energy Efficiency Performance Evaluation ofBackPressure Driven Cooperative Relay Selection for WiMAX