CODE TCP: A competitive delay-based TCP

Authors:
Yi-Cheng Chan;Chia-Liang Lin;Chia-Tai Chan;Cheng-Yuan Ho
Affiliations:
Department of Computer Science and Information Engineering, National Changhua University of Education, No. 2, Shi-Da Road, Changhua City 500, Taiwan;Department of Computer Science and Information Engineering, National Changhua University of Education, No. 2, Shi-Da Road, Changhua City 500, Taiwan;Institute of Biomedical Engineering, National Yang-Ming University, No. 155, Sec. 2, Linong Street, Taipei City 112, Taiwan;Department of Computer Science, National Chiao Tung University, No. 1001 Ta Hsueh Road, Hsinchu City 300, Taiwan
Venue:
Computer Communications
Year:
2010

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Abstract

TCP Vegas is a well-known delay-based congestion control mechanism. Studies have indicated that TCP Vegas outperforms TCP Reno in many aspects. However, Reno currently remains the most widely deployed TCP variant in the Internet. This is mainly because of the incompatibility of Vegas with Reno. The performance of Vegas is generally mediocre in environments where it coexists with Reno. Hence, there exists no incentive for operating systems to adopt Vegas as the default transport layer protocol. In this study, we propose a new variant of Vegas called COmpetitive DElay-based TCP (CODE TCP). This variant is compatible with Reno and it can obtain a fair share of network resources. CODE is a sender-sided modification and hence it can be implemented solely at the end host. Simulations and experiments confirm that CODE has better fairness characteristics in network environments in which it coexists with Reno while retaining the good features of Vegas.