无线Mesh网络中TCP公平性建模与分析  

Modeling and analyzing of TCP fairness in Wireless Mesh Network

作　　者：张蕾[1] 杨寿保[1] 王大鹏[1] 孙伟峰[1] 

机构地区：[1]中国科学技术大学计算机科学与技术系,合肥230026

出　　处：《中国科学院研究生院学报》2007年第3期342-350,共9页Journal of the Graduate School of the Chinese Academy of Sciences

基　　金：中国科学技术大学研究生创新基金资助

摘　　要：无线Mesh网络中TCP流之间存在严重的传输不公平现象,难于获得高质量且公平的TCP服务.对无线Mesh网络中影响TCP性能的各层协议进行建模有助于TCP公平性影响因素的分析和改进协议的设计.利用Markov链对基于IEEE 802.11b/g的无线Mesh网络中节点MAC层状态转换和TCP协议状态转换建模,并据此对TCP的延迟和吞吐量进行了理论分析.模拟实验结果与理论分析结果的对比证明了基于Markov链的无线Mesh网络TCP公平性建模与分析的正确性.根据建模分析总结的无线Mesh网络TCP公平性重要影响因素对改进无线Mesh网络TCP公平性研究有重要指导意义.TCP unfairness is a critical problem in Wireless Mesh Network. Fair TCP services with high quality are difficult to obtain. However, modeling for the related protocols of different layers will greatly help us analyze the active factors of TCP fair transmission and come up with better protocol design for Wireless Mesh Network. The state transitions of MAC and TCP were modelings based on Markov chain in typical IEEE 802.11b/g based Wireless Mesh Network. Then, the TCP delay and throughput were analyzed based on the modeling. The contrast between simulation results and theoretic values of delay and throughput proves that the modeling and analyzing are correct. The important factors found are helpful for research on TCP fairness in Wireless Mesh Network.

关 键 词：无线MESH网络 TCP 公平性 MARKOV链 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]