Abstract- This paper proposes a multi-dimensional Markov model to analyze performance of the IEEE802.11e EDCF protocol. Based on this model, we present extensive performance evaluation in terms of Saturation Throughput (ST), throughput ratios, and access delay of flows of distinct priorities under RTS/CTS mode. We also provide quantitative analysis of the impact of prioritized parameters, i.e., Arbitration InterFrame Space (AIFS), Contention Window (CW) on QoS differentiation. The accuracy of the proposed model is verified by means of comparing the numerical results obtained from both analytical model and simulations. I
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