TCP拥塞控制算法研究  

Research on TCP Congestion Control Arithmetic

作　　者：代丽娴[1] 黄宏本[1] 

机构地区：[1]广西梧州学院计算机科学系,广西梧州543002

出　　处：《计算机仿真》2010年第10期124-127,共4页Computer Simulation

基　　金：2006年广西教育厅科研项目(187)

摘　　要：研究无线传输优化问题,随着用户的迅速增长,使网络负载大于网络资源容量,引起拥塞、传输延时和丢包等问题。采用传统的TCP拥塞控制算法,使网络发生拥塞的可能性增大,甚至导致网络崩溃。为了解决当前的网络拥塞问题,提出了一种改进的TCP拥塞控制算法。算法根据网络拥塞跟回路响应时间的大小成正比的关系,在源端检测回路响应时间值,同时在网络拥塞产生的临界区域,采取拥塞窗口线性减小的方法,使网络远离该区域,大大降低了拥塞产生概率,避免了传统TCP算法中拥塞窗口值得大幅振荡。经仿真证实:算法比传统TCP算法有较低的丢包率,且吞吐量得到了较大的提高,改进算法能够在一定程度上缩短拥塞恢复时间,降低网络的振荡,提高网络的传输质量。There is a lot of congestion phenomenon in the Internet.Aim at that,we need safe,reliable Quality of Service in the Internet.Based on studying the principle of TCP/IP congestion control,this paper analyses a RTT-based arithmetic for solving the congestion control.In view of the possibility of congestion with the RTT increase,the arithmetic joins the side on the detection of RTT values,and in accordance with the relevant policy control cwnd value within reasonable limits.Using NS2,this arithmetic is lower packet loss rates than TCP by observation analysis.It can improve the throughput of the TCP connection and available bandwidth.Then analysis of result proves that the novel congestion contro1 algorithm can speed congestion recovery control on a certain extent,and decrease the vibration.

关 键 词：拥塞控制 丢包率 吞吐量 

分 类 号：TP393.08[自动化与计算机技术—计算机应用技术]