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Self-tuning PI rate controller for best-effort traffic with interval phase margin assignment
by Yang Hong, Oliver W.W. Yang
International Journal of Internet Protocol Technology (IJIPT), Vol. 1, No. 2, 2005
Abstract: In this paper, we propose a self-tuning PI rate controller for the AQM router to support best-effort traffic in the Internet. We apply classical control theory and use phase margin in controller design that would allow the users to achieve good stability robustness of AQM control system. Our self-tuning PI rate controller will self-tune only when the system phase margin falls outside a specified interval upon dramatic change of Internet environment. Our self-tuning PI rate controller is located in the router and would calculate the advertised transmission rates for source nodes based on the instantaneous queue length of the buffer. Our simulations demonstrate that our AQM control system can adapt not only to the fluctuation of the uncontrolled traffic but also to sudden changes of Internet environment very well, thus providing the Internet with good transient behavior.

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