IEEE 802.11 DCF协议性能分析模型

Performance Analysis Model for IEEE 802.11 Distributed Coordination Function Protocol

提出了一种改进的二维Markov链模型用于分析IEEE 802.11 DCF协议.该模型不仅考虑实际应用中饱和业务量和非饱和业务量的情况,而且考虑DCF协议的退避计时器的冻结状态和有限的重传次数.通过对该Markov链模型稳定状态的求解并结合M/M/1/K排队模型,导出了DCF系统性能的理论模型.仿真结果表明,该理论模型能够精确地预测广义IEEE 802.11 DCF协议的系统性能.

This paper proposes an improved two-dimensional Markov chain model for the performance analysis of the IEEE 802.11 DCF protocol. The model is applicable to both saturated and unsaturated traffic conditions. Moreover, it extends the existing models to take into account previously-ignored MAC layer factors such as backoff freezing and limited times of retry. In addition, by deriving the stationary state of the Markov model and considering an M/M/1/K queuing model, we further derive a theoretical model for evaluating performance of the general IEEE 802.11 DCF protocols. Accuracy of the proposed theoretical model is validated with simulation results.