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Journal of Zhejiang University SCIENCE A

ISSN 1673-565X(Print), 1862-1775(Online), Monthly

2007 Vol.8 No.1 P.113-118

Using Lyapunov function to design optimal controller for AQM routers

ZHANG Peng, YE Cheng-qing, MA Xue-ying, CHEN Yan-hua, LI Xin

School of Computer Science and Technology, Zhejiang University, Hangzhou 310027, China

zhang_peng_zju@yahoo.com.cn

Abstract: It was shown that active queue management schemes implemented in the routers of communication networks supporting transmission control protocol (TCP) flows can be modelled as a feedback control system. In this paper based on Lyapunov function we developed an optimal controller to improve active queue management (AQM) router’s stability and response time, which are often in conflict with each other in system performance. Ns-2 simulations showed that optimal controller outperforms PI controller significantly.

Key words: TCP flows, Active queue management (AQM), Lyapunov function, Optimal controls


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DOI:

10.1631/jzus.2007.A0113

CLC number:

TP393

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Received:

2006-02-10

Revision Accepted:

2006-08-23

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