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计算机工程 ›› 2012, Vol. 38 ›› Issue (17): 77-80,83. doi: 10.3969/j.issn.1000-3428.2012.17.022

• 网络与通信 • 上一篇    下一篇

基于变化率的802.11竞争窗口退避算法

陈俊霞,宋顺林,成科扬   

  1. (江苏大学计算机科学与通信工程学院,江苏 镇江 212013)
  • 收稿日期:2011-09-26 修回日期:2011-12-23 出版日期:2012-09-05 发布日期:2012-09-03
  • 作者简介:陈俊霞(1986-),女,硕士研究生,主研方向:系统仿真,网络安全;宋顺林,教授;成科扬,博士
  • 基金资助:
    江苏省高校自然科学研究基金资助项目(11KJD520004);江苏省普通高校研究生科研创新计划基金资助项目(CXZZ11_0216)

Backoff Algorithm of 802.11 Contention Window Based on Change Rate

CHEN Jun-xia, SONG Shun-lin, CHENG Ke-yang   

  1. (School of Computer Science and Telecommunication Engineering, Jiangsu University, Zhenjiang 212013, China)
  • Received:2011-09-26 Revised:2011-12-23 Online:2012-09-05 Published:2012-09-03

摘要: 在分析典型的退避算法基础上,提出一种改进的IEEE 802.11协议退避算法,引入结点碰撞频率的相对变化率和结点成功发送频率的相对变化率,以此衡量网络当前拥塞状况,根据上述2种变化率动态调整竞争窗口,降低信道接入的竞争。NS2仿真结果表明,该算法可以适应网络负载的变化,提高系统的吞吐量,降低丢包率和端到端时延。

关键词: 802.11协议, 无线网络, 竞争窗口, 退避算法, 变化率

Abstract: In order to improve the backoff algorithm of IEEE 802.11, this paper analyzes several algorithms, and introduces the change rate relative of collision frequency and successful transmission, for the scale of the current congestion of network. The algorithm adjusts contention window according to the two elements above, and reduces the contention of access and ameliorates the performance of network. NS2 simulation result proves that the algorithm can adapt the change of network load, improve the throughput and monish the packet drop rate and end-to-end delay.

Key words: 802.11 protocol, wireless network, contention window, backoff algorithm, change rate

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