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      • Department of Electrical and Electronics Engineering
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      Comparison of PI controllers designed for the delay model of TCP/AQM networks

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      Author
      Ünal H. U.
      Melchor-Aguilar, D.
      Üstebay, D.
      Niculescu, S. -I.
      Özbay, Hitay
      Date
      2013
      Source Title
      Computer Communications
      Print ISSN
      0140-3664
      Publisher
      Elsevier
      Volume
      36
      Issue
      10-11
      Pages
      1225 - 1234
      Language
      English
      Type
      Article
      Item Usage Stats
      129
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      128
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      Abstract
      One of the major problems of communication networks is congestion. In order to address this problem in TCP/IP networks, Active Queue Management (AQM) scheme is recommended. AQM aims to minimize the congestion by regulating the average queue size at the routers. To improve upon AQM, recently, several feedback control approaches were proposed. Among these approaches, PI controllers are gaining attention because of their simplicity and ease of implementation. In this paper, by utilizing the fluid-flow model of TCP networks, we study the PI controllers designed for TCP/AQM. We compare these controllers by first analyzing their robustness and fragility. Then, we implement these controllers in ns-2 platform and conduct simulation experiments to compare their performances in terms of queue length. Taken together, our results provide a guideline for choosing a PI controller for AQM given specific performance requirements.
      Keywords
      Active Queue Management
      Delay systems
      Network congestion
      PI Controller
      TCP/IP
      Active Queue Management
      Delay systems
      Network congestions
      PI Controller
      TCP/IP
      Controllers
      Internet protocols
      Queueing networks
      Permalink
      http://hdl.handle.net/11693/20940
      Published Version (Please cite this version)
      http://dx.doi.org/10.1016/j.comcom.2013.03.001
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      • Department of Electrical and Electronics Engineering 3597
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