Performance Analysis and Enhancement for Priority Based IEEE 802.11 Network

In this paper, a novel non-saturation analytical model for priority based IEEE 802.11 network is introduced. Unlike previous work that is focused on MAC backoff for saturation stations, this model uses Markov and M/ M/1/K theories to predict MAC and queuing service time and loss. Then a performance prediction based enhancement scheme is proposed. By dynamic tuning of protocol options, this proposed scheme limits end-to-end delay and loss rate of real-time traffic and maximizes throughput. Consequently, call admission control is taken to protect existing traffics when the channel is saturated. Simulations validate this model and the comparison with IEEE802.11e EDCA shows that our mechanism can guarantee quality of service more efficiently.