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Performance analysis of 802.11e EDCA WLANs with saturated and non-saturated sources

In WLANs, realtime traffic has always been given higher priority than data traffic. This creates an incentive for data users to pretend to be real-time users, which benefits themselves and degrades the performance of the rest. Our report proposes a tradeoff mechanism which benefits both low-rate realtime traffic and greedy data traffic. To understand the interaction between these two types of traffic and estimate the optimal value of MAC parameters with the proposed tradeoff mechanism, we develop a simple model of an 802.11e EDCA WLAN with these two types of traffic based on mean-field approx- imation as in previous works. However, when a network carries some large packets and many small packets, the collision probability after a large packet is much larger than predicted by previous models and our simple model. Therefore, we propose another model which captures this effect.