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Title: A Collision-Aware Backoff Mechanism for IEEE 802.11 WLANs
Authors: Chan, Yi-Cheng;Liao, Ming-Chun;Chu, Ching-Hsiang
Contributors: 資訊工程學系
Keywords: Backoff algorithm;CSMA/CA;IEEE 802.11;WLANs
Date: 2009-11
Issue Date: 2012-05-04T08:29:45Z
Abstract: The distributed coordination function (DCF) is the most widely deployed medium access control (MAC) protocol for IEEE 802.11 WLANs. It is a carrier sense multiple access with collision avoidance (CSMA/CA) scheme which employs a binary exponential backoff (BEB) algorithm to reduce the collision probability. In this paper we propose a novel backoff algorithm, collision-aware backoff mechanism (CABM), which can dynamically select a suitable contention window size according to the contention level of current network. A contention level is separately estimated by each station depending on unsuccessful frame transmission ratios. Simulation results show that our scheme outperforms the standard protocol in terms of the collision probability and system throughput, especially when the number of contending stations is large.
Relation: IEEE International Conference on Intelligent Computing and Intelligent Systems (ICIS 2009), Shanghai, China, November 20-22, 2009: 284-288
Appears in Collections:[Department and Graduate Institute of Computer Science and Information Engineering] Proceedings

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