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《》 2006-15
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An AQM congestion control algorithm based on Smith predictor

Xiang,Shaohua Xu,Bugong Peng,Dazhou  
One of the keys to assure the stability of Internet is an efficient congestion control mechanism. Internet congestion controlsystem is essentially a delay system, and the RTT (Round-Trip Time) is a very important factor in designing congestion control algo-rithms. In terms of AQM algorithm, a new kind of congestion control algorithm (Smith-PI) is designed based on Smith predictor.With simple structure, easiness of deployment, good robustness and better performance, the proposed algorithm overcomes the negativeimpact on the queue stability caused by the large delay. In the end, it is illustrated by several simulations that with application ofSmith-PI algorithm, the overshoot of queue can be decreased efficiently, higher responsive speed and steadier queue can be obtained,the buffer queue converge to the equilibrium point more quickly than PI algorithm and RED algorithm do in condition of HTTP dis-turbance or bigger overload change, and the dynamic performance can still been maintained in large-delay networks.
【Fund】: 国家自然科学基金重点项目(60334010);; 国家自然科学基金项目(60474047);; 高等学校博士学科点专项基金项目(20030561013);; 广东省自然科学基金项目(31406);; 广东省自然科学基金博士启动项目(04300046).
【CateGory Index】: TP393.07
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