Decentralised robust flow controller design for networks with multiple bottlenecks

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Munyas I., Yelbasi O., Biberovic E., İFTAR A., ÖZBAY H.

INTERNATIONAL JOURNAL OF CONTROL, vol.82, no.1, pp.95-116, 2009 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 82 Issue: 1
  • Publication Date: 2009
  • Doi Number: 10.1080/00207170801993561
  • Journal Name: INTERNATIONAL JOURNAL OF CONTROL
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.95-116
  • Keywords: communication networks, flow control, robust control, decentralised control, time-delay systems, H-infinity control, PACKET-SWITCHING NETWORKS, CONGESTION CONTROL, FEEDBACK-CONTROL
  • Anadolu University Affiliated: Yes

Abstract

Decentralised rate-based flow controller design in multi-bottleneck data-communication networks is considered. An H problem is formulated to find decentralised controllers which can be implemented locally at the bottleneck nodes. A suboptimal solution to this problem is found and the implementation of the decentralised controllers is presented. The controllers are robust to time-varying uncertain multiple time-delays in different channels. They also satisfy tracking and weighted fairness requirements. Lower bounds on the actual stability margins are derived and their relation to the design parameters is analysed. A number of simulations are also included to illustrate the time-domain performance of the proposed controllers.