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Improving TCP-Vegas Performance over Mobile Ad-hoc Networks  

Bae Han-Seok (경북대학교 컴퓨터공학과)
Song Jeom-Ki (경북대학교 컴퓨터공학과)
Kim Dong-Kyun (경북대학교 컴퓨터공학과)
Park Jung-Soo (한국전자통신연구원)
Kim Hyoung-Jun (한국전자통신연구원)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.31, no.3A, 2006 , pp. 221-231 More about this Journal
Abstract
TCP is needed as a transport protocol to provide reliable end-to-end message delivery for MANETs in order to achieve a smooth integration with the fixed Internet. Particularly, TCP has its variants, namely TCP-Reno and TCP-Vegas. However, there has been no research work on extensive performance comparison of TCP-Reno and TCP-Vegas over AODV and OLSR. This paper is the first trial to perform the research by using ns-2 simulator. Through the extensive simulations, we found that which to select among routing protocols is more important than which to select among TCP variants, because the performance difference between TCP-Reno and TCP-Vegas over uy selected routing protocol is not so much outstanding. Particularly, TCP-Vegas relies on an accurate BaseRTT estimation in order to decide the sending rate of a TCP Sender. However, it cannot be directly applied to MANET because a route change makes the Base an used over a Previous Path obsolete. Therefore, we propose a technique for improving the performance of TCP-Vegas by considering the route change, and show the performance improvement through simulation study.
Keywords
MANET; proactive; reactive; TCP-Vegas; route change;
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