RSAD: a robust distributed contention-based adaptive mechanism for IEEE 802.11 wireless LANs

Authors:
Yong Peng;Shi-Duan Cheng;Jun-Liang Chen
Affiliations:
National Laboratory of Switching Technology and Telecommunication Networks, Beijing University of Posts and Telecommunications, Beijing, P.R. China;National Laboratory of Switching Technology and Telecommunication Networks, Beijing University of Posts and Telecommunications, Beijing, P.R. China;National Laboratory of Switching Technology and Telecommunication Networks, Beijing University of Posts and Telecommunications, Beijing, P.R. China
Venue:
Journal of Computer Science and Technology
Year:
2005

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Abstract

Previous researches have shown that Distributed Coordination Function (DCF) access mode of IEEE 802.11 has lower performance in heavy contention environment. Based on the in-depth analysis of IEEE 802.11 DCF, NSAD (New Self-adapt DCF-based protocol) has been proposed to improve system saturation throughput in heavy contention condition. The initial contention window tuning algorithm of NSAD is proved effective in error-free environment. However, problems concerning the exchanging of initial contention window occur in error-prone environment. Based on the analysis of NSAD's performance in error-prone environment, RSAD is proposed to further enhance the performance. Simulation in a more real shadowing error-prone environment is done to compare the performance of NSAD and RSAD and results have shown that RSAD can achieve further performance improvement as expected in the error-prone environment than NSAD (i.e., better goodput and fairness index).