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Improving TCP Performance through Pre-detection of Route Failure in Mobile Ad Hoc Networks  

Lee Byoung-Yeul (삼성전자 전보통신)
Lim Jae-Sung (삼성전자 전보통신)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.29, no.11B, 2004 , pp. 900-910 More about this Journal
Abstract
Route failure is mainly caused by mobility of mobile host in ad hoc networks. Route failure, which may lead to sudden packet losses and delays, is losing the route from source to destination. In this situation, TCP assumes that congestion has occurred within the network and also initiates the congestion control procedures. Congestion control algorithm provides the means for the source to deal with lost packets. TCP performance in ad hoc environments will be degraded as TCP source cannot distinguish congestion from route failure. In this paper, we propose TCP-P as pre-detection approach to deal with route failure. TCP-P freezes TCP through pre-detection of route failure. Route failure information of the proposed mechanism is obtained not by routing protocol but by MAC protocol. The intermediated node, obtaining route failure information by its MAC layer, relays the information to TCP source and lets TCP source stop the congestion control algorithm. Results reveal that TCP-P responding with proactive manner outperforms other approaches in terms of communication throughput under the presence of node mobility.
Keywords
Ad Hoc Networks; Wireless TCP; Route Failure; Congestion Control; TCP Performance;
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