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Revision Accepted: 2022-04-22

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Frontiers of Information Technology & Electronic Engineering  2022 Vol.23 No.2 P.291-303


Design and analysis of a proportional-integral controller based on a Smith predictor for TCP/AQM network systems

Author(s):  Ouassim MENACER, Abderraouf MESSAI, Lazhar KASSA-BAGHDOUCHE

Affiliation(s):  Department of Electronics, Faculty of Technology Sciences, Frères Mentouri University of Constantine 1, 25000 Constantine, Algeria; more

Corresponding email(s):   kassabaghdouche_lazhar@yahoo.com, kassabaghdouche.lazhar@univ-guelma.dz

Key Words:  Active queue management, Transport control protocol, Round-trip time delay, Smith predictor

Ouassim MENACER, Abderraouf MESSAI, Lazhar KASSA-BAGHDOUCHE. Design and analysis of a proportional-integral controller based on a Smith predictor for TCP/AQM network systems[J]. Frontiers of Information Technology & Electronic Engineering, 2022, 23(2): 291-303.

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active queue management (AQM) is essential to prevent the degradation of quality of service in TCP/AQM systems with round-trip time (RTT) delay. RTT delays are primarily caused by packet-propagation delays, but they can also be caused by the processing time of queuing operations and dynamically changing network situations. This study focuses on the design and analysis of an AQM digital controller under time-delay uncertainty. The controller is based on the smith predictor algorithm and is called the SMITHPI controller. This study also demonstrates the stability of the controller and its robustness against network parameter variations such as the number of TCP connections, time delays, and user datagram protocol flows. The performance, robustness, and effectiveness of the proposed SMITHPI controller are evaluated using the NS-2 simulator. Finally, the performance of the SMITHPI controller is compared with that of a well-known queue-based AQM, called the proportional-integral controller.


Ouassim MENACER1, Abderraouf MESSAI1, Lazhar KASSA-BAGHDOUCHE2
1Frères Mentouri University of Constantine 1技术科学学院电子系,阿尔及利亚君士坦丁市,25000
28 May 1945 University of Guelma科学与技术学院电子通讯系,阿尔及利亚盖尔马市,24000


Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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