Contention window optimization for ieee 802.11 DCF access control

Authors:
Der-Jiunn Deng;Chih-Heng Ke;Hsiao-Hwa Chen;Yueh-Min Huang
Affiliations:
Dept. of Comput. Sci. & Inf. Eng., Nat. Changhua Univ. of Educ.;-;-;-
Venue:
IEEE Transactions on Wireless Communications - Part 1
Year:
2008

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Abstract

According to the latest version of the IEEE 802.11 standard, the backoff parameters of its collision avoidance mechanism are far from optimal, especially in a heavy load or error-prone WLAN environment. This strategy has a high collision probability and channel utilization is degraded in bursty arrivals or congested scenarios. Besides, the standard backoff mechanism may treat noise corruption as packet collisions. In this paper, we identify the relationship between backoff parameters, contention level, and channel BER in order to propose a simple, but yet well-performing distributed algorithm that allows a station to dynamically adjust its contention window size based on turn-around-time measurement of channel status. In addition to theoretical analysis, simulations are conducted to evaluate its performance. The proposed scheme works very well in providing a substantial performance improvement in heavy loaded and error-prone WLAN environments.