Stability and TCP-friendliness of AIMD/RED systems with feedback delays

  • Authors:
  • Lijun Wang;Lin Cai;Xinzhi Liu;Xuemin (Sherman) Shen

  • Affiliations:
  • Department of Applied Mathematics, University of Waterloo, Waterloo ON, Canada N2L 3G1;Department of Electrical and Computer Engineering, University of Victoria, Victoria, BC, Canada V8W 3P6;Department of Applied Mathematics, University of Waterloo, Waterloo ON, Canada N2L 3G1;Department of Electrical and Computer Engineering, University of Waterloo, Waterloo ON, Canada N2L 3G1

  • Venue:
  • Computer Networks: The International Journal of Computer and Telecommunications Networking
  • Year:
  • 2007

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Abstract

In this paper, we systematically study the stability of a class of generalized Additive Increase and Multiplicative Decrease/Random Early Detection (AIMD/RED) system. Sufficient conditions are obtained for asymptotic stability of both homogeneous-flow system and heterogeneous-flow system with or without feedback delay by using indirect Lyapunov and Lyapunov-Razumikhin method. Our study reveals the relationship between the AIMD parameters and the average window size of competing AIMD flows. Consequently, the Transmission Control Protocol (TCP)-friendly condition is derived. Numerical results with Matlab and simulation results with NS-2 are given to validate the theorems and analytical results. The analysis and the stability conditions derived can be used as a guideline to set up the AIMD/RED system parameters in order to maintain network stability and integrity, and to enhance system performance.