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

  • Authors:

  • Pierre-FrançOis Quet;Banu AtaşLar;Altuğ Iftar;Hitay ÖZbay;Shivkumar Kalyanaraman;Taesam Kang

  • Affiliations:

  • Department of Electrical Engineering, The Ohio State University, Columbus, OH 43210, USA;Department of Electrical and Electronics Engineering, Anadolu University, Eskişehir 26470, Turkey;Department of Electrical and Electronics Engineering, Anadolu University, Eskişehir 26470, Turkey;Department of Electrical Engineering, The Ohio State University, Columbus, OH 43210, USA;Department of Electrical, Computer, and Systems Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, USA;Department of Aerospace Engineering, Konkuk University, # 1 Whayang-dong, Gwangjin-ku, Seoul 143-701, South Korea

  • Venue:
  • Automatica (Journal of IFAC)
  • Year:
  • 2002

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Abstract

An H^~ 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.