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In WLANs, real-time 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. The authors' paper proposes a tradeoff mechanism which benefits both low-rate real-time 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, they develop a simple model of an 802.11e EDCA WLAN with these two types of traffic based on mean-field approximation as in previous works.
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