北京邮电大学学报

  • EI核心期刊

北京邮电大学学报 ›› 1999, Vol. 22 ›› Issue (4): 60-64.

• 研究报告 • 上一篇    下一篇

非对称信道对TCP性能的影响及其解决方法

李慧玲, 郑文星, 胡正名   

  1. 北京邮电大学信息工程系, 北京 100876
  • 收稿日期:1999-06-23 出版日期:1999-11-10
  • 基金资助:
    国家自然科学基金重大课题资助项目(69896240)

The Effects of Asymmetric Links on TCP Performance and Its Solutions

Li Huiling, Zheng Wenxing, Hu Zhengming   

  1. Department of Information Engineering, Beijing University of Posts and Telecommunications, Beijing 100876
  • Received:1999-06-23 Online:1999-11-10

摘要: TCP是利用接收端返回的确认信息调整发送端数据发送的传输层协议.在非对称信道存在的网络中, 当传输确认信息的信道带宽远小于传输数据的信道带宽, 确认信息的传输速率小于数据包的传输速率时, TCP数据传输的吞吐量受到确认信息返回速率的限制.经过分析发现, 非对称信道上产生的问题主要是由于信道对确认包的“瓶颈”而引起的.本文以此为出发点, 从减少确认信息返回的数量和频率方面, 对TCP的接收端和发送端算法进行改进, 并对改进算法做了进一步的仿真.

关键词: TCP, 非对称信道, 吞吐量

Abstract: TCP is a transport layer protocol that regulate itsforward data sending through reverse ACKs.In asymmetric network where the bandwidth of reverse link is far less than forward link and the link rate of ACKs is slower than data, TCP data throughput is greatly limited by the reverse limk.Themain reason for this limitation arisen is the bottleneck of ACKs in the reverselink.Serving this as the starting point, this paper presents algorithms to decrease the number of ACKs and to reduce ACK frequency as solutions.These improvingalgorithms may be implemented in both sender and receiver.We also tested them through simulations.

Key words: TCP, asymmetric links, throughput

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