Delay Modeling and Analysis of IEEE 802.11 DCF with Selfish Nodes

Research on selfish nodes in wireless ad hoc networks has received considerable attention recently. However, most work concentrates on throughput study of the effects of selfish nodes, but lacks an analytical study to accurately predict the delay. With the rising popularity of delay-sensitive real-time multimedia applications (video, voice and data) in wireless ad hoc networks, it is becoming important to study the MAC delay performance of ad hoc networks in the presence of selfish nodes. In this paper, based on a two-dimensional Markov chain model, we analyze the medium access delay with selfish nodes. The proposed analysis applies both the basic access and the RTS/CTS access mechanisms. Through extensive simulations, the analytical model and delay results of selfish nodes and well-behavior nodes are validated using IEEE 802.11 DCF protocol.