Title :
A robust AQM controller design for various delay networks
Author :
Xiuli Wang ; Yongji Wang
Author_Institution :
Sch. of Inf., Central Univ. of Finance & Econ., Beijing, China
Abstract :
The existing active queue management (AQM) algorithms are not well adapted to the uncertainty of the time-delay networks. When an algorithm designed for the small time-delay network (LAN) is used for a large-delay networks (WAN, Internet), its performance is normally poor. This paper presents a robust AQM design algorithm based on the D stability region to overcome this issue. The TCP/AQM model meeting various time-delay is first established. Secondly, a set of desired D-stable regions in the complex plane is specified and then a numerical optimization algorithm with various time-delay constraints is run to find the controller parameters such that all the roots of the closed-loop system are within the specified regions to reduce the queuing delay and improve the effective throughput. Compared with the PI controller via experimental simulations, the novel AQM algorithm is indeed more efficient and robust in various delay networks.
Keywords :
closed loop systems; computer networks; control system synthesis; optimisation; queueing theory; robust control; PI controller; TCP/AQM model; active queue management; closed-loop system; large-delay networks; numerical optimization; queuing delay; robust AQM controller design; small time-delay network; time-delay constraint; time-delay networks; Adaptation model; Algorithm design and analysis; Biological system modeling; Delay; Mathematical model; Robustness; Steady-state; Active Queue Management; D-stability; Parameter Adaptive; Robust Control; Time-delay;
Conference_Titel :
Control Conference (CCC), 2010 29th Chinese
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-6263-6
