Analysis on Adjustment-Based TCP-Friendly Congestion Control: Fairness and Stability

  • Authors:
  • Wei Wu;Yong Ren;Xiuming Shan

  • Affiliations:
  • -;-;-

  • Venue:
  • LCN '01 Proceedings of the 26th Annual IEEE Conference on Local Computer Networks
  • Year:
  • 2001

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Abstract

In this paper, we focus on understanding the binomialcongestion control algorithms, which is proposed in [11]and can generalize TCP-style additive-increase byincreasing inversely proportional to a power k of thecurrent window (for TCP, k=0) and generalize TCP-stylemultiplicative-decrease by decreasing proportional to apower l of the current window (for TCP, l=1).We discusstheir global fairness and stability.We prove that suchcongestion control algorithms can achieve (p, k+l+1)-proportionalfairness globally no matter what thenetwork topology is and how many users there are.Wealso study their dynamical behavior through a controltheoretical approach.The smoothness of the congestioncontrol will result in a less stable system and slowerconvergence to the fair bandwidth allocation.Themodeling and discussion in this paper are quite generaland can be easily applied to equation-based TCP-friendlycongestion control scheme, another category ofTCP-friendly transport protocols.