The effect of uncertain time variant delays in ATM networks with explicit rate feedback

M. L. Sichitiu, P. H. Bauer, K. Premaratne

Research output: Contribution to journalConference articlepeer-review

7 Scopus citations


A new, more realistic model for the ABR traffic class in ATM network congestion control is introduced and analyzed. The new discrete time model takes into account the effect of time-variant buffer occupancy levels of ATM switches, thus treating the case of time-variant delays between a single congested node and the connected sources. For highly dynamic situations, such a model is crucial for a valid analysis of the resulting feedback system. The new model also handles the effects of the mismatch between the RM cell rates and the variable bit rate controller sampling rate as well as buffer and rate nonlinearities. A stability study is presented, that shows an equilibrium in the buffer occupancy level is not possible if time-variant delays are present in the forward path. Stability conditions for the case of time-variant delays in the return path are derived. Finally, illustrating examples are provided.

Original languageEnglish (US)
Pages (from-to)4537-4543
Number of pages7
JournalProceedings of the American Control Conference
StatePublished - 2001
Externally publishedYes
Event2001 American Control Conference - Arlington, VA, United States
Duration: Jun 25 2001Jun 27 2001

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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