Title: Design of AQM controllers for IP routers based on H∞ optimal control

Authors: Qiang Chen, Oliver W.W. Yang

Addresses: Computer Communication Network Research Lab, School of Information Technology and Engineering, University of Ottawa, 161 Louis Pasteur, CBY-A514, Ottawa, Ontario K1N 6N5, Canada. ' Computer Communication Network Research Lab, School of Information Technology and Engineering, University of Ottawa, 161 Louis Pasteur, CBY-A514, Ottawa, Ontario K1N 6N5, Canada

Abstract: Based on the recently developed feedback control model for the Transport Control Protocol (TCP), this paper has formulated controller design procedures for Active Queue Management (AQM) in Internet Protocol (IP) routers using the H∞ optimal control theory. The H∞ loop-shaping technique is applied to solve the S/U Mixed Sensitivity Problem (MSP) and S/T/U MSP in the controller design. Different weight functions and their impacts on the system performance are evaluated and discussed. The effectiveness of the designed controller is verified through OPNET simulations.

Keywords: Transport Control Protocol; TCP; Internet Protocol; IP routers; active queue management; AQM; computer communication network; H∞ optimal control; loop-shaping design; mixed sensitivity problem; MSP; congestion control.

DOI: 10.1504/IJIPT.2006.010560

International Journal of Internet Protocol Technology, 2006 Vol.1 No.4, pp.252 - 263

Published online: 01 Aug 2006 *

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