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IEEE802.11 DCF退避机制分析和改进

陈羽中   

  1. 中国科学技术大学 信息处理中心, 安徽 合肥 230026
  • 收稿日期:2004-10-22 修回日期:2004-12-27 出版日期:2006-01-31 发布日期:2006-01-31

Analysis and Improvement of the Backoff Mechanism Used in IEEE 802.11 DCF


CHEN Yu-Zhong   

  1. Information Processing Center, University of Science and Technology of China，Hefei 230026, China
  • Received:2004-10-22 Revised:2004-12-27 Online:2006-01-31 Published:2006-01-31

被引次数

24

摘要： 引入二维马尔科夫模型,对退避时隙选择概率分布对IEEE802.11DCF系统性能的影响进行了理论分析，并提出了一种简单有效的退避时隙选择改进方案。仿真结果证明, 该方案能够有效提高IEEE802.11的饱和吞吐量。

关键词: 分布协调功能, 退避时隙选择概率分布, 饱和吞吐量

Abstract:

IEEE802.11 is the most popular WLAN standard based on CSMA/CA. The primary Medium Access Control (MAC) protocol of IEEE802.11 is the contention-based distributed coordination function (DCF) which adopts uniform distribution for backoff process. In this paper, a Markov model is introduced to analyze the impact of backoff time distribution on system performance of IEEE802.11 DCF.A simple and effective mechanism for backoff time distribution is the proposed. Simulation result proves that this mechanism can effectively improve saturation throughput .

Key words:

Keywords: distributed coordination function, backoff time distribution, saturation throughput