Rate-based flow controllers for communication networks in the presence of uncertain time-varying multiple time-delays

Quet P., Ataslar B., Iftar A., Ozbay H., Kalyanaraman S., Kang T.

AUTOMATICA, vol.38, no.6, pp.917-928, 2002 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 38 Issue: 6
  • Publication Date: 2002
  • Doi Number: 10.1016/s0005-1098(01)00276-x
  • Journal Name: AUTOMATICA
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.917-928
  • Keywords: communication networks, flow control, H-infinity control, time-delay systems, uncertain time-varying multiple time-delays, ROBUST STABILIZATION, ATM NETWORKS, H-INFINITY, CONGESTION, SYSTEMS
  • Anadolu University Affiliated: No


An H-infinity based robust controller is designed for a rate-feedback flow-control problem in single-bottleneck communication networks. The controller guarantees stability robustness to uncertain time-varying multiple time-delays in different channels. It also brings the queue length at the bottleneck node to the desired steady-state value asymptotically and satisfies a weighted fairness condition. Lower bounds for stability margins for uncertainty in the time-delays and for the rate of change of the time-delays are derived. A number of simulations are included to demonstrate the time-domain performance of the controller. Trade offs between robustness and time-domain performance are also discussed. (C) 2002 Elsevier Science Ltd. All rights reserved.