Aiming at the wireless access network planning method of WLAN,the coverage planning is studied in the as⁃pects of propagation prediction and coverage design respectively,and the capacity planning,interference analysis and channel configuration optimization based on DCF protocol are studied. For capacity planning,the two⁃dimensional Markov model with backoff window mechanism (BEB) is adopted to analyze and improve the DCF performance based on CSMA/CA protocol. The improved backoff algorithm based on RTS/CTS is proposed. The performances of system normalized throughput,packet loss rate and network delay under saturation condition are obtained to guide the estimation of practical throughput and network capacity planning. The theoretical analysis and OPNET simulation are compared. The comparison results show that the proposed new algo⁃rithm can reduce the collision probability of data package and time delay,and increase the system throughput and network capacity.%针对WLAN无线接入网络的规划方法，分别从传播预测及覆盖设计方面研究覆盖规划、分析研究基于DCF协议的容量规划以及干扰分析和信道优化配置等。其中容量规划部分采用已有退避窗口机制（BEB）的二维马尔可夫模型，对基于CSMA/CA协议的DCF性能进行分析并改进。提出了基于RTS/CTS机制改进的退避算法，得出了饱和条件下系统归一化吞吐率、丢包率、网络延时等性能，以指导实际吞吐量的估算和网络容量规划。经过理论分析和OPNET仿真比较，所提出的新算法降低了数据包的碰撞概率，从而降低了时延，增加了系统吞吐率，进而增加了网络容量。
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