可选择应答方式的IEEE 802.11e EDCF改进协议

IEEE 802.11e EDCF protocol with selective acknowledgement, SAEDCF is proposed in this paper. After considering the characteristics of real-time and non-real-time traffic, SAEDCF provides different service policy for multimedia traffic, such as acknowledgement for real-time service and no acknowledgement for non-real-time service, so quality of real-time service is assured better with admission control mechanism. SAEDCF may solve the problem of Exposed Station by using delayed acknowledgement. A tri-dimensional Markov chain is presented to compute system throughput and successful transmission probability of multimedia service under any network load. Simulation results show that SAEDCF performs better than EDCF does and the analytical result is accurate.