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During the past few years the widespread use of the Wireless Local Area Networks (WLANs) communication technique is one of the most popular technologies in data telecommunications and networking. In this paper, the authors propose Priority Random Early Detection (PRED) algorithm which integrated Random Early Detection (RED) with IEEE 802.11e EDCF to support QoS in WLANs. Simulation results show that PRED algorithm can provide better performance of Access Categories (ACs) with high priority than that EDCF with traditional queuing (FIFO) strategy. Besides, they performed the parameters tuning according to the traffic load. By dynamically tuning the parameters, they can prevent throughput decreasing due to the large number of collisions under heavy traffic load condition.
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