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计算机工程 ›› 2009, Vol. 35 ›› Issue (2): 89-91. doi: 10.3969/j.issn.1000-3428.2009.02.032

• 网络与通信 • 上一篇    下一篇

基于动态Cache的无线局域网快速切换算法

倪维国1,2,董永强1,2,张 聪1,2   

  1. (1. 东南大学计算机科学与工程学院,南京 210096;2. 东南大学计算机网络和信息集成教育部重点实验室,南京 210096)
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2009-01-20 发布日期:2009-01-20

Fast Handoff Algorithm for WLAN Based on Dynamic Cache

NI Wei-guo1,2, DONG Yong-qiang1,2, ZHANG Cong1,2   

  1. (1. School of Computer Science and Engineering, Southeast University, Nanjing 210096; 2. Key Laboratory of Computer Network and Information Integration(Southeast University), Ministry of Education, Nanjing 210096)
  • Received:1900-01-01 Revised:1900-01-01 Online:2009-01-20 Published:2009-01-20

摘要: BSS切换产生的时延和抖动会严重影响实时语音等实时业务的性能。为了提高用户获得的网络性能,该文提出一种基于动态阈值的切换触发机制,可以在保证切换灵敏度的前提下解决频繁切换的问题,在此基础上设计实现一种基于动态Cache机制的快速切换算法。实验结果表明,该算法可有效地减小切换时延,性能优于静态Cache机制。

关键词: 无线局域网, IEEE 802.11协议, 快速切换

Abstract: Real-time voice service is negatively influenced by the delay and jitter caused by Basic Service Set(BSS) handoff. This paper proposes a new handoff triggering mechanism with dynamic threshold, which is sensitive to signal variance while eliminating the Ping-Pong handoff effect. In order to achieve higher network performance, a fast handoff algorithm based on dynamic Cache is presented. Experimental result demonstrates that the algorithm effectively reduces handoff latency and outperforms other algorithms based on static Cache.

Key words: WLAN, IEEE 802.11 protocol, fast handoff

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