IEEE 802.11e EDCA网络模型分析  

Modeling analysis of IEEE 802.11e EDCA under saturation condition

作　　者：王刚[1] 周银东[1] 梅顺良[1] 

机构地区：[1]清华大学电子工程系微波与数字通信技术国家重点实验室,北京100084

出　　处：《清华大学学报（自然科学版）》2005年第10期1389-1392,1396,共5页Journal of Tsinghua University(Science and Technology)

摘　　要：IEEE 802.11e网络在介质访问层(M AC)对业务的服务质量(Q oS)提供支持,现有802.11e增强型分布式协调接入机制(EDCA)分析模型没有考虑站点内部调度算法的影响,所得结果与实际网络性能有一些偏差。该文提出了一种新型的EDCA分析模型。该模型采用M arkov链分析方法,以宏观多站点竞争信道为基础,充分考虑了内部调度算法在站点多业务竞争中产生的影响。分析了由于内部调度算法对不同业务吞吐率和延时性能产生的影响。仿真结果表明:该模型在描述EDCA性能上,比现有模型具有明显的优越性,特别是充分体现出内部调度算法对性能的影响。The IEEE 802.11e network provides different with QoS （quality of service） guarantee for different traffic streams. However, the internal scheduler is not accurately modeled in available analytical models of the 802.11 EDCA （Enhanced Distributed Channel Access）, which results in differences between analytical results and the actual network performance. This paper presents Markov chain model for the EDCA. The model takes into account both the competition between multiple nodes and the internal scheduler when collisions occur inside the node. Throughput and packet delay analysis are also analyzed. Simulation results show that the model provides superior EDCA performance evaluations, especially with the internal scheduler.

关 键 词：无线数据通信 802.11e EDCA分析模型 

分 类 号：TN919.72[电子电信—通信与信息系统]