CODE TCP: A competitive delay-based TCP

Yi Cheng Chan*, Chia Liang Lin, Chia Tai Chan, Cheng Yuan Ho

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


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.

Original languageEnglish
Pages (from-to)1013-1029
Number of pages17
JournalComputer Communications
Issue number9
StatePublished - 1 Jun 2010


  • Congestion control
  • Fairness
  • TCP Reno
  • TCP Vegas
  • Transport layer protocol


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