PERFORMANCE IMPROVEMENT OF BOTTLENECK LINK IN RED VEGAS OVER HETEROGENEOUS NETWORKS

Abstract

In communication networks, congestion avoidance in routers is one of the hottest topics. Current IP network has become the dominant paradigm for all networking environments. The significant cause of packet losses in such heterogeneous networks is no longer limited to network congestion. Traditional TCP interprets every packet loss as caused by congestion which may be not the case in the current Internet. TCP Vegas detects network congestion in the early stage and successfully prevents periodic packet loss that usually occurs in TCP Reno. In this paper a new variant of TCP Vegas namedRed Vegas has used. The Red Vegas may detect random packet losses precisely. Through the packet loss differentiation, Red Vegas reacts appropriately to the losses, and therefore the throughput of connection over heterogeneous networks significantly improved. The bandwidth of the bottleneck link is under-utilized when the random loss rate is high. Therefore, a new design of the fast recovery mechanism for Red Vegas would be carried out. The proposed mechanism improves the aggression of Vegas TCP in competing for the available bandwidth whilst maintaining the inherent stability of the original Vegas TCP scheme.