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Predictive functional control for active queue management in congested TCP/IP networks

Bigdeli, N ; Sharif University of Technology | 2009

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  1. Type of Document: Article
  2. DOI: 10.1016/j.isatra.2008.10.001
  3. Publisher: 2009
  4. Abstract:
  5. Predictive functional control (PFC) as a new active queue management (AQM) method in dynamic TCP networks supporting explicit congestion notification (ECN) is proposed. The ability of the controller in handling system delay along with its simplicity and low computational load makes PFC a privileged AQM method in the high speed networks. Besides, considering the disturbance term (which represents model/process mismatches, external disturbances, and existing noise) in the control formulation adds some level of robustness into the PFC-AQM controller. This is an important and desired property in the control of dynamically-varying computer networks. In this paper, the controller is designed based on a small signal linearized fluid-flow model of the TCP/AQM networks. Then, closed-loop transfer function representation of the system is derived to analyze the robustness with respect to the network and controller parameters. The analytical as well as the packet-level ns-2 simulation results show the out-performance of the developed controller for both queue regulation and resource utilization. Fast response, low queue fluctuations (and consequently low delay jitter), high link utilization, good disturbance rejection, scalability, and low packet marking probability are other features of the developed method with respect to other well-known AQM methods such as RED, PI, and REM which are also simulated for comparison. © 2008 ISA
  6. Keywords:
  7. Active queue management ; Model predictive control ; TCP/AQM networks ; AC generator motors ; Computer networks ; Disturbance rejection ; Functions ; Jitter ; Metropolitan area networks ; Network management ; Predictive control systems ; Queueing networks ; Queueing theory ; Robustness (control systems) ; Transmission control protocol ; Computational loads ; Controller parameters ; Explicit congestion notifications ; External disturbances ; Fast responses ; FLOW models ; Handling systems ; Linearized fluids ; Link utilizations ; Loop transfer functions ; Low delays ; Packet marking probabilities ; Predictive functional control ; Resource utilizations ; Simulation results ; Small signals ; TCP networks ; TCP/IP networks ; Control theory
  8. Source: ISA Transactions ; Volume 48, Issue 1 , 2009 , Pages 107-121 ; 00190578 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0019057808000657