Performance analysis of IEEE 802.11e enhanced distributed coordination function

The IEEE 802.11e working group aims to enhance the current 802.11 MAC to support the integrated data and voice (or video) communications. Till now a draft of the IEEE 802.11e EDCF has been proposed. In this paper, we evaluate the performance of the EDCF by dividing the traffic into two categories, namely real-time packets and non real-time packets, and use an analytical model to quantify the performance of both IFS priority and CW priority in the EDCF. We also propose a new priority scheme, which allows the user to continuously send real-time packets. We define the maximum number of real-time packets that a user can continuously send to get a good balance between the fairness and the priority. Our proposed scheme is shown to provide much better results than IEEE 802.11e EDCF.

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