A feedback based scheme for improving TCP performance in ad-hoc wireless networks

被引：47

作者：

Chandran, K ^{[1
]}

Raghunathan, S ^{[1
]}

Venkatesan, S ^{[1
]}

Prakash, R ^{[1
]}

机构：

[1] Univ Texas, Comp Sci Program, Richardson, TX 75083 USA

来源：

18TH INTERNATIONAL CONFERENCE ON DISTRIBUTED COMPUTING SYSTEMS, PROCEEDINGS | 1998年

关键词：

D O I：

10.1109/ICDCS.1998.679778

中图分类号：

TP301 [理论、方法];

学科分类号：

081202 ;

摘要：

Ad-hoc networks are completely wireless networks of mobile hosts, in which the topology rapidly changes due to the movement of mobile hosts. This frequent topology may lead to sudden packet losses and delays. Transport protocols like TCP have been built mainly for reliable, fixed networks. Hence, when used in adhoc networks, TCP misinterprets this lass as congestion and invokes congestion control. This leads to unnecessary retransmissions and loss of throughput. To overcome this problem, a feedback scheme is proposed, so that the source can distinguish between route failure and network; congestion. When a route is disrupted, the source is sent a Route Failure Notification(RFN) packet, allowing it to freeze its timers and stop sending packets. When tice route is re-established, the source is informed through a Route Re-establishment Notification (RRN) packet, upon which it resumes try unfreezing timers and continuing packet transmissions. The simulated performance of TCP on ad-hoc networks with and without feedback: is compared and reported. A is observed that in the event of route failures, as the route re-establishment time increases,the use of feedback provides significant gains in throughput as well as savings in unnecessary packet transmissions. Several further enhancements and directions for future work are also sketched.

引用

页码：472 / 479

页数：8