UMAV: A Simple Enhancement to the IEEE 802.11 DCF

Authors:
Daji Qiao;Kang G. Shin
Affiliations:
-;-
Venue:
HICSS '03 Proceedings of the 36th Annual Hawaii International Conference on System Sciences (HICSS'03) - Track 9 - Volume 9
Year:
2003

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Abstract

In this paper, we propose a simple enhancement tothe Distributed Coordination Function (DCF) of the IEEE 802.11MAC protocol, called the Unified Multiple Access with Variablecontention window (UMAV), to improve the throughput performance of the 802.11 DCF systems. The basic ideas of UMAV arethat (1) a new P(polling)-mode is introduced for frame transmissions in addition to the conventional C (contention)-mode used inthe DCF, so as to reduce the number of contending stations; and(2)an enhanced uniform backoff scheme is used to replace thebinary exponential backoff scheme of the DCF, so as to achievea low frame collision probability and maximize the channel utilization. Our in-depth simulation shows that UMAV outperformsthe IEEE 802.11 DCF significantly in terms of both the aggregatesystem throughput and the average station access delay undervarious load conditions. Moreover, UMAV can react properlyand quickly to the traffic load fluctuations, and achieve excellentfairness, a desirable byproduct.