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IEICE Transactions on Communications 2008 E91-B(4):987-997; doi:10.1093/ietcom/e91-b.4.987
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Copyright © 2008 The Institute of Electronics, Information and Communication Engineers

Regular Section -- Papers -- Network

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

Yi-Cheng CHAN1, Chia-Liang LIN1 and Cheng-Yuan HO2

1 The authors are with the Department of Computer Science and Information Engineering, National Changhua University of Education, Changhua, Taiwan. E-mail: ycchan{at}cc.ncue.edu.tw, 2 The author is with the Department of Computer Science, National Chiao Tung University, Hsinchu, Taiwan.


  Abstract

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.

Key Words: congestion control, high bandwidth-delay product networks, TCP Vegas, transport protocol

Manuscript received April 12, 2007. Manuscript revised July 3, 2007.

* This work was sponsored by the National Science Council, Taiwan, R.O.C., under Grant NSC 96-2221-E-018-008.


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