基于冲突感知的IEEE 802.11 DCF性能分析模型  

Performance analysis model of IEEE 802.11 DCF based on collision perception

作　　者：刘洺辛[1] 高春雪[1] 

机构地区：[1]燕山大学信息科学与工程学院,河北秦皇岛066004

出　　处：《燕山大学学报》2013年第2期148-152,共5页Journal of Yanshan University

基　　金：河北省自然科学基金资助项目(F2011203067)

摘　　要：对IEEE 802.11 DCF机制的核心算法二进制指数退避算法提出一种基于冲突感知的分析模型:基于平均竞争窗口与冲突概率之间的关系,得到在饱和条件下系统的延时和吞吐量分析模型,并得出基本接入模式与RTS/CTS接入模式的切换门限值。该模型简化了BEB算法,降低了计算复杂度,但能很好地反映算法特性。通过理论分析与OPNET仿真,验证了模型的正确性,同时为预测和优化无线网络系统的性能提供理论依据。An analytical model based on collision perception is proposed for the binary exponential backoff（BEB） algorithm,which is the core algorithm of IEEE 802.11 DCF： based on the relationship of the average contention window size and the collision probability,the model of delay and throughput of the system under the condition of saturation are established,and then the handoff thresholds of the basic mechanism and the RTS/CTS mechanism are computed.The model simplifies the BEB algorithm and reduces the computational complexity,but can well react its characteristic.Through the theory analysis and simulation using the network simulator-OPNET,the accuracy of the model is confirmed,and it provides a theory basis for predicting and optimizing the performance of the wireless network.

关 键 词：DCF 冲突概率 延时 饱和吞吐量 切换门限值 

分 类 号：TN925.93[电子电信—通信与信息系统]