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非饱和状态下IEEE 802.11 DCF的性能分析


  1. (1.西北工业大学 电子信息学院,陕西 西安 710072; 2.西安电子科技大学 综合业务网理论及关键技术国家重点实验室,陕西 西安 710071)
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2007-02-20 发布日期:2007-02-25

Performance analysis of the IEEE 802.11 DCF in the non-saturation state

LI Bo1;LI Jian-dong2;FANG Yong1

  1. (1. School of Electronics and Information, Northwestern Polytechnical Univ., Xi′an 710072, China;2. State Key Lab. of Integrated Service Networks, Xidian Univ., Xi′an 710071, China)
  • Received:1900-01-01 Revised:1900-01-01 Online:2007-02-20 Published:2007-02-25

摘要: 在非饱和状态下,针对具有多业务支持能力的IEEE 802.11 分布式协调功能,提出了一种简单有效的性能分析模型.该模型中引入了“虚拟时隙”以及“虚拟时隙状态”的概念,近似地将无线终端的行为在时间上离散化.以此为基础用二维Markov链对系统的性能进行了建模,利用该模型得到了平均分组传输延迟的近似闭合解,并提出了控制所有通信业务的平均分组传输延迟方法,有助于进一步研究如何对系统性能进行预测与优化.

关键词: 无线局域网, IEEE 802.11 DCF, 服务质量, 性能分析

Abstract: In the case of the non-saturation state, a simple and effective analysis model is proposed for the IEEE 802.11 DCF with multiple traffic supporting. In the model, the concepts of “Virtual Time Slot” and “Virtual Time Slot State” are introduced, which discretize the behavior of a wireless terminal. Based on it, a two dimensional Markov chain is used in the model. By using the proposed model, the approximated closed form solutions of the average packet delays are obtained. Moreover, the method for controlling the average packet delays of all the traffic flows is given. The proposed model and the obtained analytical results help one to further study how to predict and optimize the system performance.

Key words: wireless LAN, IEEE 802.11 DCF, quality of service, performance analysis


  • TN915.04