H_∞制御によるTCP/AQMネットワークの幅輳制御器設計と実験的検証

概要

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The purpose of this paper is to design a congestion controller for TCP/AQM networks based on the H∞ control theory, and validate the effectiveness of the designed H∞ congestion controller via a testbed which is the small-scale network for verification of the designed H∞ congestion controller. Firstly, a nonlinear and the linearized model of TCP/AQM networks are introduced, and control objectives are described. The H∞ congestion controller is designed by solving the mixed sensitivity problem for the linearized model. In order to verify the designed H∞ congestion controller, we show simulation results using SIMULINK and ns-2 simulator, and compare the congestion controller via PI control with the designed H∞ congestion controller. Finally, we develop a testbed for verification of the effectiveness of the designed H∞ congestion controller which is implemented to the testbed by improving Linux kernel and carry out an experiment. As experimental results using the developed testbed, we show the queue size in the router, where the designed H∞ congestion controller is implemented, and confirm that the control objectives are achieved.
2004-10-01