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The 802.11e MAC protocol extends the 802.11 CSMA/CA contention mechanism by allowing the adjustment of MAC parameters that were previously fixed. While the 802.11e protocol has been extensively studied, the work discussed in this paper is almost entirely confined to analytical and simulation studies. This paper demonstrates a technique for measuring one-way delay in an 802.11e hardware testbed and thereby studies delay in the context of protecting a voice call competing against data traffic. The paper demonstrates that with the standard 802.11b MAC settings greedy data traffic is able to seize bandwidth from a low-rate voice call.

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