802.11 WLAN区分服务机制及其性能分析  

Diffserv Mechanism in 802.11 WLAN and Its Performance Analysis

作　　者：吴志刚[1] 白光伟[1] 吴艳洁[1] 

机构地区：[1]南京工业大学计算机科学与技术系,南京210009

出　　处：《计算机工程》2009年第21期94-96,100,共4页Computer Engineering

基　　金：国家自然科学基金资助项目(60673185);教育部留学回国人员科研启动基金资助项目(教外司留[2007]1108号);江苏省"青蓝工程"中青年学术带头人培养对象基金资助项目(苏教师[2007]2号)

摘　　要：针对无线AdHoc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。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.

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 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]