Self-tuning PI rate controller for best-effort traffic with interval phase margin assignment

Authors:
Yang Hong;Oliver W. W. Yang
Affiliations:
CCNR Lab, School of Information Technology and Engineering, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada.;CCNR Lab, School of Information Technology and Engineering, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
Venue:
International Journal of Internet Protocol Technology
Year:
2005

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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.