標題: A multichain backoff mechanism for IEEE 802.11 WLANs
作者: Ye, Shiang-Rung
Tseng, Yu-Chee
資訊工程學系
Department of Computer Science
關鍵字: backoff algorithms;medium access control (MAC);multichain backoff (MCB);wireless local area networks (WLANs)
公開日期: 1-Sep-2006
摘要: The distributed coordination function (DCF) of IEEE 802.11 standard adopts the binary exponential backoff (BEB) for collision avoidance. In DCF, the contention window is reset to an initial value, i.e., CWmin, after each successful transmission. Much research has shown that this dramatic change of window size may degrade the network performance. Therefore, backoff algorithms, such as gentle DCF (GDCF), multiplicative increase-linear decrease (MILD), exponential increase-exponential decrease (EIED), etc., have been proposed that try to keep the memory of congestion level by not resetting the contention window after each successful transmission. This paper proposes a multichain backoff (MCB) algorithm, which allows stations to adapt to different congestion levels by using more than one backoff chain together with collision events caused by stations themselves as well as other stations as indications for choosing the next backoff chain. The performance of MCB is analyzed and compared with those of 802.11 DCF, GDCF, MILD, and EIED backoff algorithms. Simulation results show that, with multiple backoff chains and collision events as reference for chain transition, MCB can offer a higher throughput while still maintaining fair channel access than the existing backoff algorithms.
URI: http://dx.doi.org/10.1109/TVT.2006.877467
http://hdl.handle.net/11536/11813
ISSN: 0018-9545
DOI: 10.1109/TVT.2006.877467
期刊: IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
Volume: 55
Issue: 5
起始頁: 1613
結束頁: 1620
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