A Quantitative Model for the Parameter Setting of RED with TCP Traffic

  • Authors:
  • Thomas Ziegler;Christof Brandauer;Serge Fdida

  • Affiliations:
  • -;-;-

  • Venue:
  • IWQoS '01 Proceedings of the 9th International Workshop on Quality of Service
  • Year:
  • 2001

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Abstract

This paper systematically derives a quantitative model how to set the parameters of the RED queue management algorithm as a function of the scenario parameters bottleneck bandwidth, round-trip-time, and number of TCP flows. It is shown that proper setting of RED parameters is a necessary condition for stability, i.e. to ensure convergence of the queue size to a desired equilibrium state and to limit oscillation around this equilibrium. The model provides the correct parameter settings, as illustrated by simulations and measurements with FTP and Web-like TCP flows in scenarios with homogeneous and heterogeneous round trip times.