摘要
TCP协议假定链路上的数据丢失率极小 ,所以当数据传输中出现丢包情况时 ,它认为是由于网络拥塞而导致的 ,并且相应地采取拥塞避免机制。然而在无线网络中 ,由于信道比特差错率高 ,移动主机切换等原因 ,经常会导致数据的丢失。如果把这种情况下的数据报丢失错误归因于网络拥塞而采取拥塞控制机制 ,则不必要地降低了吞吐量 ,导致自身性能下降。文章首先介绍了针对无线移动网络所常用的TCP性能增强方法 ,然后提出了一种基于MIPv6的移动主机切换情况下TCP性能增强的方法并进行了分析。
Because in wired network,transmission errors are relatively rare,TCP assumes that segment losses are due to network congestion,and triggers congestion avoidance mechanisms.Unfortunately,this is not true for wireless network where,due to higher bit error rate and handoff,transmission losses are more frequent.If TCP responds to all losses by invoking congestion control and avoidance algorithms,it will essentially degrade the performance unnecessarily.First the recent developments of wireless mobile networks with TCP are introduced.Then a new method based on MIPv6 to enhance TCP performance in wireless networks are presented and analyzed.
出处
《计算机应用与软件》
CSCD
北大核心
2004年第8期69-71,共3页
Computer Applications and Software
