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《Control Theory & Applications》 2006-02
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Design and analysis of predictive PI algorithm for congestion control in time-delay network

QIAN Yan-ping,LI Qi,DIAO Xiang(Research Institute of Automation,Southeast University,Nanjing Jiangsu 210096,China)  
A predictive proportional integral(PPI) congestion control algorithm is proposed which combined Smith predictor and Dahlin algorithm to alleviate the time-delay influence on the performance of active queue management(AQM) in network.The Smith predictor is utilized to compensate the time-delay,while Dahlin principle is employed to design controller to reduce the number and interaction of tuning parameters.A classical control method is also introduced to analyze the stability of the system and the transients as well as steady-state behaviors of bottleneck queue with link capacity disturbances.Finally,simulation results are given to show the PPI algorithm's advantages through experiments with disturbances,and comparison between random early detection(RED) and proportional integral(PI) algorithms are also made.
【CateGory Index】: TP393.07
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