A simple mechanism for stabilizing network queues in TCP/IP networks

James Aweya, Michel Ouellette, Delfin Y. Montuno

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


In this paper we determine the stability bounds for the DRED active queue management (AQM) algorithm using a previously developed nonlinear dynamic model of TCP. We develop a second-order linear model with time delay by linearizing the nonlinear model. Using the Pade approximation of time-delayed system e -R0s, where R0 is the delay in the system, we then determine the range of stabilizing gains of DRED when controlling the second-order system with time delay R0. We also present examples showing the stability bounds of the DRED controller gain for networks with different parameters such as link capacity, load level, and round-trip time. In addition, we describe an efficient implementation of the DRED AQM algorithm.

Original languageBritish English
Pages (from-to)275-286
Number of pages12
JournalInternational Journal of Network Management
Issue number4
StatePublished - Jul 2007


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