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最优化参数逼近的自适应退避算法

朱颖;武穆清
  

  1. (北京邮电大学 通信网络综合技术研究所,北京 100876)
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2007-12-20 发布日期:2007-12-20

Self-adaptive backoff algorithm in IEEE 802.11 with optimum parameter approaching

ZHU Ying;WU Mu-qing
  

  1. (Inst. of Communication Networks Integrated Technique, Beijing Univ. of Posts and Telecommunications, Beijing 100876, China)
  • Received:1900-01-01 Revised:1900-01-01 Online:2007-12-20 Published:2007-12-20

摘要: 为在不同网络规模下改善网络的拥塞状况并达到或逼近最佳的网络性能,提出了一种基于最优化参数逼近的自适应退避算法(SAOP).根据理论最佳归一化发帧负载随站点数增加近似保持恒定的特性,周期性自适应调整自身的最小竞争窗口,使网络当前的归一化发帧负载(冲突和成功发送次数比值)逼近理论最佳值,从而使网络拥塞状况得到改善.仿真结果表明,该算法使802.11局域网的饱和吞吐量提高了48%,使时延减小了31%(Basic接入模式,网络规模80个站点),随网络规模变化的吞吐量平均达到理论最大值的98%.

关键词: 自适应退避算法, 最优化参数, 最小竞争窗口

Abstract: In order to improve the network performance in congestion status and to achieve or approach the optimum performance in different network scales, a self-adaptive backoff algorithm named SAOP is proposed based on Optimum Parameter approaching. By taking the approximate invariability character of the optimum sending load(ratio of count in collision and success sending), every WLAN station adjusts the self minimum contention window periodically, making current sending load approach the optimum value, to improve the network congestion status. Simulation proves that SAOP can enhances the IEEE 802.11 WLAN saturation throughput by 48%, decreases the delay by 31% when the network scale is 80 stations in the basic access mode, and is close to the theoretical max throughput in the network scale-throughput curve (98% the max throughput on average).

Key words: self-adaptive backoff algorithm, optimum parameter, minimum contention window

中图分类号: 

  • TN929.5