DSR路由信息存储的无线TCP性能改进方法

Improving Wireless TCP Performance Based on DSR Route Information Storage

当使用TCP业务作为负载时往往会影响TCP性能,这是由于在多路径传输时频繁的帧失序会造成发送端不必要的超时重传,严重影响TCP性能.本文提出了一种路由信息存储策略,在发现路由中断时发送端进入“冻结”状态,当判断帧丢失是由路由中断引起后,使用存储路由信息,避免由于频繁重新发起路由请求造成TCP性能下降.试验证明,使用基于路由信息存储方法在节点运动剧烈时,可以有效地提高无线TCP性能.

Muhipath routing can improve path availability in a mobile environment. Most previous research routing used UDP traffic for performance evaluation. We find that using multiple paths simultaneously may on muhipath degrade TCP performance, due basically to frequent out-of-order packet delivery via different paths. This paper proposes a new way of improving wireless TCP performance based on DSR routing protocols through storage route, particularly when the nodes are fast-moving that cause route discontinuity. The sender enters a ＂frozen＂ state when packets are lost. Having found that packet drop is caused by route discontinuity, the route information that has been stored is used. This can reduce degradation of the TCP performance due to continual route request. Simulation shows that the proposed approach can significantly improve the TCP performance.