Performance Analysis of Quality of Service in IEEE 802.11e Wireless LANs

Fei Peng

11th Communications and Networking Simulation Symposium (CNS 2008)
Ottawa, Canada, April 14-17 2008

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Summary

There have been many performance studies for the original IEEE 802.11 DCF: both simulation and analytical studies. However, the emerging IEEE 802.11e hasn’t investigated extensively. This paper proposed an accurate analytical model for the enhanced distributed coordination function (EDCF): the core operation of 802.11e. The model captures the operation of AIFS, contention window differentiation and TXOP in EDCF. Using this model, we derive throughput performance of EDCF service classes through mechanisms: contention window size, AIFS and TXOP limit differentiations. The throughput and collision probability derived by our model are validated very well by simulation results. Our model provides a useful tool for evaluating the impact of different priority parameters on the performance of EDCF service differentiation.

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