Aggregate Rate Control


by Jae Chung and Mark Claypool

This is a practical PI control-based AQM offering aggregated rate control (ARC) for TCP traffic. ARC is founded on classic control theory and a sound understanding of PI behavior for the Internet traffic control domain, yielding a reduced parameter PI controller and easy configuration while keeping proven system stability characteristics. We modeled a TCP-ARC feedback control system using a linear TCP model} and developed practical yet effective ARC configuration guidelines. The guidelines cover issues in choosing a target stable boundary system for ARC configuration and provide a method for selecting control parameters that help avoid system instability even when the system is out of the stability boundary. The guidelines also address the effects of the rate sampling interval on system stability, a consideration often neglected in other AQM studies.

(See the technical report for the guidelines).


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