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中国科学院大学学报 ›› 2007, Vol. 24 ›› Issue (3): 342-350.DOI: 10.7523/j.issn.2095-6134.2007.3.012

• 论文 • 上一篇    下一篇

无线Mesh网络中TCP公平性建模与分析

张 蕾 杨寿保 王大鹏 孙伟峰   

  1. 中国科学技术大学计算机科学与技术系,合肥 230026
  • 收稿日期:1900-01-01 修回日期:1900-01-01 发布日期:2007-05-15

Modeling and analyzing of TCP fairness in wireless mesh network

ZHANG Lei, YANG Shou-Bao, WANG Da-Peng, SUN Wei-Feng   

  1. Computer Science Department, University of Science and Technology of China, Hefei 230026, China
  • Received:1900-01-01 Revised:1900-01-01 Published:2007-05-15

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。本文利用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。根据建模分析总结得的无线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。

关键词: 无线Mesh网络, TCP, 公平性, Markov链

Abstract: TCP unfairness is a critical problem in Wireless Mesh Network. Fair TCP services with high quality are difficult to obtain. While 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 modeling 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 influence factors found are helpful for research on TCP fairness in Wireless Mesh Network.

Key words: Wireless Mesh Network, TCP, fairness, Markov chain

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