Dynamic Contention Window Control Scheme in IEEE 802.11e Wireless LANs

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Executive Summary

In the IEEE 802.11 MAC protocol, Access Points (APs) are given the same authority as Wireless Terminals (WTs) in terms of acquiring the wireless link, even though they aggregate several downlink flows. This feature leads to a serious throughput degradation of downlink flows, compared with uplink flows. In this paper, the authors propose a dynamic contention window control scheme for the IEEE 802.11e EDCA-based WLANs, in order to achieve fairness between uplink and downlink TCP flows while guaranteeing QoS requirements for real-time traffic. The proposed scheme first determines the minimum contention window size in the best-effort access category at APs, based on the number of TCP flows.

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