Quick Vegas: Improving Performance of TCP Vegas for High Bandwidth-Delay Product Networks

Yi-Cheng CHAN  Chia-Liang LIN  Cheng-Yuan HO  

IEICE TRANSACTIONS on Communications   Vol.E91-B   No.4   pp.987-997
Publication Date: 2008/04/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e91-b.4.987
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Network
congestion control,  high bandwidth-delay product networks,  TCP Vegas,  transport protocol,  

Full Text: PDF(563.5KB)>>
Buy this Article

An important issue in designing a TCP congestion control algorithm is that it should allow the protocol to quickly adjust the end-to-end communication rate to the bandwidth on the bottleneck link. However, the TCP congestion control may function poorly in high bandwidth-delay product networks because of its slow response with large congestion windows. In this paper, we propose an enhanced version of TCP Vegas called Quick Vegas, in which we present an efficient congestion window control algorithm for a TCP source. Our algorithm improves the slow-start and congestion avoidance techniques of original Vegas. Simulation results show that Quick Vegas significantly improves the performance of connections as well as remaining fair when the bandwidth-delay product increases.