Comparison of PI controllers designed for the delay model of TCP/AQM networks

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ÜNAL H. U., Melchor-Aguilar D., Ustebay D., Niculescu S., ÖZBAY H.

COMPUTER COMMUNICATIONS, cilt.36, sa.10-11, ss.1225-1234, 2013 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 36 Sayı: 10-11
  • Basım Tarihi: 2013
  • Doi Numarası: 10.1016/j.comcom.2013.03.001
  • Dergi Adı: COMPUTER COMMUNICATIONS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.1225-1234
  • Anahtar Kelimeler: Active Queue Management, Delay systems, PI Controller, Network congestion, TCP/IP, SUPPORTING TCP FLOWS, STABILITY ANALYSIS, TCP/RED SYSTEMS, AQM, ROBUST, FRAGILE, RULES, RED
  • Anadolu Üniversitesi Adresli: Evet

Özet

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. (C) 2013 Elsevier B.V. All rights reserved.