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Journal of Information Science and Engineering, Vol. 26 No. 5, pp. 1771-1785 (September 2010)

Optimization of IEEE 802.11 Multirate Wireless LAN

A. V. BABU, LILLYKUTTY JACOB AND S. ABDUL SUBHAN
Department of Electronics and Communication Engineering
National Institute of Technology Calicut
Calicut 673601, India

IEEE 802.11 standards support multiple data transmission rates with dynamic rate switching capability to improve the performance. With multirate enhancement, data transmission from wireless LAN (WLAN) stations can take place at various rates according to channel conditions. This paper investigates the problem of optimizing aggregate saturation throughput of a multirate WLAN. Analytical expressions for transmission rate specific optimal minimum Contention Window (CWmin) values that simultaneously maximize aggregate saturation throughput and provide proportional throughput differentiation among different stations are determined. It is demonstrated that, with these optimal CWmin values, the achievable aggregate throughput is much greater than that of the basic configuration in which competing stations use the same MAC parameters. Further, every station gets a throughput proportional to its data rate. We also derive analytical expression for the maximum aggregate saturation throughput assuming very large number of active stations.

Keywords: IEEE 802.11 multirate wireless local area networks, distributed coordination function, maximum aggregate throughput, proportional differentiation, performance analysis

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Received August 14, 2008; revised December 8, 2008; accepted February 12, 2009.
Communicated by Yu-Chee Tseng.