IEEE 802.11分布式协调功能的非饱和性能分析

IEEE 802.11 distributed coordination function (DCF) is one of the most influential standards of wireless local area network. DCF is based on carrier sense multiple access with collision avoidance scheme and binary slotted exponential backoff. A tri-dimensional Markov chain, 3M model, is presented in this paper to analyze the performance of DCF under non-saturatoin condition. In this case, each station generates a new packet for transmission according to a Poisson process after the completion of each successful transmission. Simulation results show that the analysis results of system throughout and probabilities of successful transmission and collision of data frame are accurate under different packet arrival rates.