The IEEE 802.11e task group has reached a stable consensus on two basic contention-based priority mechanisms to promote for standardization: usage of different arbitration interframe spaces and usage of different minimum/maximum contention windows. The goal of this paper is to provide a thorough understanding of the principles behind their operation. To this purpose, rather than limit the investigation to high-level (e.g. throughput and delay) performance figures, a closer look is taken at their detailed operation, also in terms of low-level performance metrics (e.g., the probability of accessing specific channel slots).
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