An Improved Analytical Model for IEEE802.11e Enhanced Distributed Channel Access

In this paper, we propose an improved discrete three- dimension Markov chain model to describe the IEEE 802.11e EDCA characteristics. The unifying model is designed to compute the sustained probabilistic properties for each prioritized AC under saturation condition. In this framework, we consider elaborately the modified the AIFS and backoff co-operation process in EDCA defined by the IEEE 802.11e standard rather than those previous literature which concern the original EDCF protocol defined by draft version. Comprehensive simulation studies validate our analytical approach is quite fair in predicting the system saturation throughput. Ultimately, our model and analysis can provide an in-depth understanding and insights into the IEEE 802.11e EDCA features.