Modelling QoS Performance of IEEE 802.11 DCF Under Practical Channel Fading Conditions
The authors consider the impacts of channel fading on the Quality of Service (QoS) performance of the IEEE 802.11 system. Traditional 2-D Markov chain models, while suitable for throughput analysis, are unable to capture the QoS performance due to the lack of a proper queueing model. They present a 3-D Markov chain queueing model that incorporates channel fading effects. The Markov chain is solved efficiently with their Collapsed Transition onto Basis approach. In doing so, they are able to investigate important QoS measures, packet delay and loss, as well as throughput, for a 802.11 system under practical channel fading conditions. The analytical results are validated by extensive simulations.