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Most of the deployed IEEE 802.11e Wireless Local Area Networks (WLANs) useinfrastructure Basic Service Set (BSS) in which an Access Point (AP) serves asa gateway between wired and wireless domains. We present the unfairness problembetween the uplink and the downlink flows of any Access Category (AC) in the802.11e Enhanced Distributed Channel Access (EDCA) when the default settings ofthe EDCA parameters are used. We propose a simple analytical model to calculatethe EDCA parameter settings that achieve weighted fair resource allocation forall uplink and downlink flows. We also propose a simple model-assistedmeasurement-based dynamic EDCA parameter adaptation algorithm. Moreover, ourdynamic solution addresses the differences in the transport layer and theMedium Access Control (MAC) layer interactions of User Datagram Protocol (UDP)and Transmission Control Protocol (TCP). We show that proposed ContentionWindow (CW) and Transmit Opportunity (TXOP) limit adaptation at the AP providesfair UDP and TCP access between uplink and downlink flows of the same AC whilepreserving prioritization among ACs.

Fairness Provision in the IEEE 802.11e Infrastructure Basic Service Set