计算机应用

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一种基于IEEE 802.11e的多跳无线网络拥塞控制协议

毛建兵 毛玉明 冷甦鹏   

  1. 电子科技大学 电子科技大学 电子科技大学
  • 收稿日期:2007-08-16 修回日期:1900-01-01 发布日期:2008-02-01 出版日期:2008-02-01
  • 通讯作者: 毛建兵

Congestion control protocol for multi-hop wireless networks based on IEEE 802.11e

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  • Received:2007-08-16 Revised:1900-01-01 Online:2008-02-01 Published:2008-02-01
  • Contact: Jian-Bing MAO

摘要: 多跳无线网络中网络拥塞的出现将严重降低网络的性能。基于802.11e提供的区分业务类型的信道接入优先级机制,提出了一种对尽力而为(best-effort)类型业务动态调整其优先级进行网络拥塞控制的协议。该算法的主要思想是对发生网络拥塞的节点提升其业务流传输的优先级使其获得更多的传输机会以缓解拥塞状况,并对严重的网络拥塞状况采取反向施压的策略降低上游节点业务流的转发速率。仿真结果表明,该算法有效地提高了网络重负载情况下的吞吐量。

关键词: 拥塞控制, 多跳无线网络, 动态优先级调整

Abstract: Congestion in multi-hop wireless networks would lead to degradation of network performance.While the 802.11e protocol has provided differentiated channel access priorities for different types of traffic, we proposed a new method to carry out congestion control for multi-hop wireless networks by dynamically adjusting the priority of best-effort traffic.The main idea was to promote the service priority of best-effort traffic when light congestion was detected,and degrade its service priority in upstream nodes when severe congestion happened. The simulation results show that the proposed scheme can effectively promote the network throughput when the network is heavily loaded.

Key words: 802.11e, congestion control, multi-hop wireless networks, 802.11e, dynamic priority adjusting