An analysis and implementation study on a robust congestion controller for the internet

Authors:
Li Yu;Yantai Shu;Maode Ma;Ming Tang
Affiliations:
Tianjin University, Tianjin, China;Tianjin University, Tianjin, China;Nanyang Technological University, Singapore;Nanyang Technological University, Singapore
Venue:
ICAIT '08 Proceedings of the 2008 International Conference on Advanced Infocomm Technology
Year:
2008

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Abstract

We proposed a parameter-tunable robust proportional-integral-differential (PID) controller for active queue management (AQM) based on modern H∞ optimal control theory in [12]. Our robust PID controller can be tuned only by one parameter unlike traditional PID controllers, which are tuned by three or more. Additionally, this new parameter assignment method can be extended to other controller designed for AQM scheme based on classical control theory or optimal control theory. In this paper, we present an analysis and implementation study on it. Taken both robustness and closed loop performance into considerations, most desirable parameters value can be identified by the analytical formulas derived by us. Theoretical analysis shows that the proposed controller can converge to the reference value in steady state. Simulation results confirm our expectation that our PID controller for AQM outperforms the existing well-known congestion controllers, such as RED and PI controller, on keeping the router queue size at the target value without queue vibration. Further, the most important feature is that the controller is robust to the network dynamics and traffic load changes.