计算机工程 ›› 2009, Vol. 35 ›› Issue (21): 94-96,1.doi: 10.3969/j.issn.1000-3428.2009.21.031

• 网络与通信 • 上一篇    下一篇

802.11 WLAN区分服务机制及其性能分析

吴志刚,白光伟,吴艳洁   

  1. (南京工业大学计算机科学与技术系,南京 210009)
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2009-11-05 发布日期:2009-11-05

Diffserv Mechanism in 802.11 WLAN and Its Performance Analysis

WU Zhi-gang, BAI Guang-wei, WU Yan-jie   

  1. (Dept. of Computer Science and Technology, Nanjing University of Technology, Nanjing 210009)
  • Received:1900-01-01 Revised:1900-01-01 Online:2009-11-05 Published:2009-11-05

摘要: 针对无线Ad Hoc网络不能区分数据流优先级的问题,提出一种基于802.11DCF退避算法的改进机制,该机制通过减少高优先级数据流的MAC层重传次数,使发送高优先级数据流(如实时数据流)的节点更容易连接信道,高优先级数据流占有更多带宽资源,从而减少传输时延。分析结果表明,该算法能有效提高高优先级数据流的传输性能。

关键词: 移动自组织网络, 区分服务, 马尔科夫链模型, 性能分析

Abstract: Aiming at the problem that wireless Ad Hoc networks can not provide any priority scheme, this paper proposes a proved mechanism based on 802.11DCF back-off algorithm. The new mechanism, by reducing the retransmission number of high-priority data flows at the data link layer, can make high-priority data flow(such as Real-time data flow) access channel more easily, the high-priority data flow can obtain more bandwidth, and the average end-to-end delay is reduced as well. Analysis results show that the new algorithm can improve the transmission performance of data flows in high priority significantly.

Key words: Ad Hoc networks, diffserv, Markov chain model, performance analysis

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