Frontiers of Information Technology & Electronic Engineering
>> 2022,
Volume 23,
Issue 2
doi:
10.1631/FITEE.2000245
Design and analysis of a proportional-integral controller based on a Smith predictor for TCP/AQM network systems
Affiliation(s): Department of Electronics, Faculty of Technology Sciences, Frères Mentouri University of Constantine 1, 25000 Constantine, Algeria; Department of Electronics and Telecommunications, Faculty of Science and Technology, 8 May 1945 University of Guelma, 24000 Guelma, Algeria; less
Received: 2020-05-23
Accepted: 2022-02-28
Available online: 2022-02-28
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Abstract
(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 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.
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