GA-based PID active queue management control design for a class of TCP communication networks

Active queue management (AQM) is a key congestion control scheme for reducing packet loss and improving network utilization in TCP/IP networks. This paper proposes a proportional–integral-derivative (PID) controller as an active queue manager for Internet routers. Due to the limitations of packet-dr...

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Bibliographic Details
Published in:Expert systems with applications 2009-03, Vol.36 (2), p.1903-1913
Main Authors: Chen, Chang-Kuo, Kuo, Hang-Hong, Yan, Jun-Juh, Liao, Teh-Lu
Format: Article
Language:English
Subjects:
AQM
Congestion control
Genetic algorithm
PID controller
TCP/IP
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Summary:Active queue management (AQM) is a key congestion control scheme for reducing packet loss and improving network utilization in TCP/IP networks. This paper proposes a proportional–integral-derivative (PID) controller as an active queue manager for Internet routers. Due to the limitations of packet-dropping probability and the effects of propagation delays in TCP networks, the TCP AQM network was modeled as a time-delayed system with a saturated input. An improved genetic algorithm is employed to derive optimal or near optimal PID controller gains such that a performance index of integrated-absolute error (IAE) is minimized, and thereby a stable queue length, low packet loss, and high link utilization for TCP networks are guaranteed. The performance of the proposed control scheme is evaluated in various network scenarios via a series of numerical simulations.
ISSN:0957-4174
1873-6793
DOI:10.1016/j.eswa.2007.12.003