北京邮电大学学报

  • EI核心期刊

北京邮电大学学报 ›› 2004, Vol. 27 ›› Issue (4): 92-96.

• • 上一篇    下一篇

链路层重传对无线Ad hoc网络TCP性能影响的研究

望育梅, 刘 雨, 张惠民   

  1. 北京邮电大学信息工程学院, 北京100876
  • 收稿日期:2003-04-28 出版日期:2004-04-28
  • 作者简介:望育梅( 1974— ) , 女, 博士生. E-mail: b018158@ bupt . ed u. cn;张惠民( 1940— ) , 男, 教授, 博士生导师. E-mai l: hm zhang@ bup t. ed u. cn
  • 基金资助:
    国家自然科学基金项目( 60072036)

How the Link-Layer Retransmission Affects the TCP Performance in Wireless Ad hoc Networks

WAN G Yu-mei, LIU Yu, ZHAN G Hui-min   

  1. Info rmat ion Engineering School , Bei jing Universi t y of Pos ts and Tel ecomm unicati ons, Beijing 100876, China
  • Received:2003-04-28 Online:2004-04-28

摘要: 在基于IEEE 802. 11 M AC接入的无线Ad hoc 网络中,突发性较弱的TCP反向应答包在与正向数据包竞争信道时处于劣势,从而引起TCP连接周期性的多余重传. 静态拓扑研究表明,适中的链路层重传上界(如5次)可获得最优的TCP性能,且该最优重传上界与网络业务负载大小有关系; 动态拓扑研究则显示,不同节点移动速度对链路层重传上界不敏感.

关键词: 无线Ad hoc 网络, 媒体接入控制, 传输控制协议

Abstract: It is found that the rev erse ACK ( acknow ledgement ) segment s wi ll bedefeated by the forw ard TC P ( t ransmission co nt rol pro tocol ) segment s in the competi tion o f wi reless shared channel in IEEE 802. 11-based Ad hoc netw orks.Thus spurious TCP ret ransmi ssio n timeo uts w ill happen periodically. The analysis under static topo log y prov es that sui table link-lay er retransmissio n limit , e. g. 5,can g et optimal TC P performa nce. The o ptimum ret ra nsmi ssio n limi t i s related to the t raffic load added in the netw ork. The simula tion under dynamic to po logy show s that di fferent moving speed o f no des w on 't bring additio nal requi rement s on link-layer ret ransmission for higher TCP throug hput.

Key words: wi reless Ad ho c netw orks, medium access cont rol, t ransmission cont rol pro tocol

中图分类号: