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The authors present the unfairness problem between the uplink and the downlink flows in the IEEE 802.11e infrastructure Basic Service Set (BSS) when the default settings of the Enhanced Distributed Channel Access (EDCA) parameters are used. First, they propose an analytical model to calculate the EDCA parameter set that ideally achieves a predetermined utilization ratio between uplink and downlink flows. Next, they design a simple and practical model-assisted measurement-based dynamic parameter adaptation algorithm. In the design of the proposed algorithm, they also consider the interactions of the bi-directional communication structure of Transmission Control Protocol (TCP) with the Medium Access Control (MAC) layer algorithm.
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