Delay analysis of IEEE 802.11e EDCA with enhanced QoS for delay sensitive applications

The performance of IEEE 802.11e enhanced distributed channel access (EDCA) mechanism effects by the network loads. It is observed that when the number of users increases in each access category, the delay significantly increased in EDCA algorithm. The performance improvement in EDCA algorithm in fluctuating network load is a challenging task. To improve the performance of EDCA algorithm for delay sensitive services, we propose an adaptive contention window algorithm, which adjusts the contention window with the number of user in each access category. We introduce a simple but novel model for delay analysis based on EDCA mechanism. The proposed model analyzes the quality of service for the delay-sensitive applications such as voice and video. The simulation result verifies the significance of the proposed model compared to the EDCA model.