Implementation experiments to evaluate a new TCP congestion control supporting loss-fairness

Kazumine Ogura, Zhou Su, Jiro Katto

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper proposes a new TCP congestion control supporting loss-fairness, which also contributes to improving RTT fairness. It has been well known that smaller RTT flows grab more bandwidth than larger ones when they compete on the shared link. This is called RTT unfairness and is caused by congestion control mechanism of the current TCP. To solve this problem, many protocols have been proposed. TCP-Libra is one of them, which formulates its window increase rate as a function of RTT and brings the same throughput irrespective of different RTT values. However, we indicate TCP-Libra's formulation holds only when the congestion window is halved upon packet losses similar to TCP-Reno. When we apply different (smarter) window control schemes, the formulation has to be modified accordingly. Therefore, in this paper, we consider a hybrid congestion control supporting RTT fairness which switches two modes according to buffering state at the bottleneck link. In decrement phase upon packet loss, it decreases window size to clear the buffering packets instead of halving the window size. Furthermore, we introduce the concept of loss-fairness for our window increase formulation, which is equivalent to RTTfairness. Experiments are carried out to validate the proposed method by both implementation experiments and simulations, and much better performances are achieved against conventional methods.

Original languageEnglish
Title of host publication2010 IEEE International Workshop Technical Committee on Communications Quality and Reliability, CQR 2010
DOIs
Publication statusPublished - 2010 Dec 20
Event2010 IEEE International Workshop Technical Committee on Communications Quality and Reliability, CQR 2010 - Vancouver, BC, Canada
Duration: 2010 Jun 82010 Jun 10

Publication series

Name2010 IEEE International Workshop Technical Committee on Communications Quality and Reliability, CQR 2010

Conference

Conference2010 IEEE International Workshop Technical Committee on Communications Quality and Reliability, CQR 2010
CountryCanada
CityVancouver, BC
Period10/6/810/6/10

Keywords

  • Component
  • Congestion control
  • Loss fairness
  • RTT fairness

ASJC Scopus subject areas

  • Safety, Risk, Reliability and Quality

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  • Cite this

    Ogura, K., Su, Z., & Katto, J. (2010). Implementation experiments to evaluate a new TCP congestion control supporting loss-fairness. In 2010 IEEE International Workshop Technical Committee on Communications Quality and Reliability, CQR 2010 [5619919] (2010 IEEE International Workshop Technical Committee on Communications Quality and Reliability, CQR 2010). https://doi.org/10.1109/CQR.2010.5619919