Parameter γ conditions for stability of FAST TCP

  • Authors:

  • Wei Liang;Shunyi Zhang;Xiangyan Ning;Yanfei Sun;Jinyi Chang

  • Affiliations:

  • Nanjing University of Posts and Telecommunications, Nanjing, China and Dept. of Computer science and technology, Changshu Institute of Technology, Changshu, China;Nanjing University of Posts and Telecommunications, Nanjing, China;Nanjing University of Posts and Telecommunications, Nanjing, China;Nanjing University of Posts and Telecommunications, Nanjing, China;Dept. of Computer science and technology, Changshu Institute of Technology, Changshu, China

  • Venue:
  • WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
  • Year:
  • 2009

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Abstract

The stability of FAST TCP in a single-link single-source is studied in this paper. A continuous time fluid flow model of the link buffer is considered to build a linear control system model related to FAST TCP. Linearing the fluid flow model and window control model, Laplace transform version of the equations are presented. It results in a negative feedback system with open loop transfer function. With the analysis of Nyquist curve of the system, a sufficient condition on asymptotical stability of FAST TCP congestion window related to the parameter is obtained. Packet level ns2 simulations are used to verify the theoretical claims.