Title: Achievable performance gain of IEEE 802.11 multi-rate link adaptation algorithm with cross-layer design

Authors: Zuoyin Tang; Jianhua He; Yan Zhang; Zhong Fan

Addresses: School of Engineering and Applied Science, Aston University, Birmingham B4 7ET, UK ' College of Engineering, Swansea University, Swansea SA2 8PP, UK ' Simula Research Laboratory, Department of Informatics, University of Oslo, Oslo, Norway ' Toshiba Research Europe Limited, Telecommunications Research Laboratory, 32 Queen Square, Bristol BS1 4ND, UK

Abstract: Link quality-based rate adaptation has been widely used for IEEE 802.11 networks. However, network performance is affected by both link quality and random channel access. Selection of transmit modes for optimal link throughput can cause medium access control (MAC) throughput loss. In this paper, we investigate this issue and propose a generalised cross-layer rate adaptation algorithm. It considers jointly link quality and channel access to optimise network throughput. The objective is to examine the potential benefits by cross-layer design. An efficient analytic model is proposed to evaluate rate adaptation algorithms under dynamic channel and multi-user access environments. The proposed algorithm is compared to link throughput optimisation-based algorithm. It is found rate adaptation by optimising link layer throughput can result in large performance loss, which cannot be compensated by the means of optimising MAC access mechanism alone. Results show cross-layer design can achieve consistent and considerable performance gains of up to 20%. It deserves to be exploited in practical design for IEEE 802.11 networks.

Keywords: medium access control; MAC; link adaptation; cross-layer design; performance modelling; wireless networks; IEEE 802.11 networks; Markov chain; adaptive communications systems; autonomous communications; performance gain; network performance; link quality; random channel access; cross-layer rate adaptation; network throughput; analytic modelling.

DOI: 10.1504/IJAACS.2015.067704

International Journal of Autonomous and Adaptive Communications Systems, 2015 Vol.8 No.1, pp.42 - 59

Published online: 21 Mar 2015 *

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