Robust Congestion Control Design for Input Time Delayed AQM System

  • Ji Hoon Yang
  • Seung Jung Shin
  • Dong Kyun Lim
  • Jeong Jin Kang
Part of the Communications in Computer and Information Science book series (CCIS, volume 200)


This paper proposes the LQ-Servo control for input-time-delayed AQM(Active Queue Management) using Loop-shaping method. The proposed controller structure is made by both taking a traditional servo mechanism based on Linear Quadratic approach and augmenting a new state variable. And, the new loop shaping method is developed by shifting all zeros to a larger pole of AQM model to determine the design parameters. And also, the proposed LQServo controller is extended the control input with time-delay using Smith’s principle.


Congestion control Flow-based traffic management Loop- Shaping LQ-Servo Time-delay 


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  1. 1.
    Jacobson, V., Karels, M.J.: Congestion Avoidance and Control. In: SIGCOMM’ss (1988)Google Scholar
  2. 2.
    Floyd, S., Jacobson, V.: Random Early Detection gateways for Congestion Avoidance. IEEE/ACM Transactions on Networking 1(4) (1997)Google Scholar
  3. 3.
    Braden, B., et al.: Recommendations on Queue Management and Congestion Avoidnace in the Internet, RFC2309 (1998)Google Scholar
  4. 4.
    Misra, V., Gong, W.-B., Towsley, D.: Fluid-based analysis of a nerwork of AQM routers supporting TCP flows with an application to RED. In: Proc. ACM SIGCOMM, pp. 151–160 (2000)Google Scholar
  5. 5.
    Hollot, C.V., Misra, V., Towsley, D., Gong, W.B.: A control theoritic analysis of RED. In: Proc. IEEE INFOCOM (2001)Google Scholar
  6. 6.
    Hollot, C.V., Misra, V., Towsley, D., Gong, W.B.: Analysis and Design of Controller for AQM Routers Supporting TCP Flows. IEEE Transcations on Automatic Control 47(6), 945–959 (2002)MathSciNetCrossRefGoogle Scholar
  7. 7.
    Aweya, J., Ouellette, M., Monyuno, D.Y.: A control theoretic approach to active queue management. Computer Networks 36, 203–235 (2001)CrossRefGoogle Scholar
  8. 8.
    Ren, F., Lin, C., Ying, X., Shan, X., Wang, F.: A robust active queue management algorithm based on sliding mode variable structure control. In: Proc. IEEE/INFOCOM (2002)Google Scholar
  9. 9.
    Yang, J.H., Suh, B.S.: Robust PID Controller for AQM based on Linear Quadratic Approach. In: IAENG International Conference on Communication Systems and Applications, Hong Kong, pp. 1083–1087 (2008)Google Scholar
  10. 10.
    Lima, M.M.A.E., Fonseca, N.L.S., Geromel, J.C.: An Optimal Active Queue Managemnet Controller, pp. 2261–2266. IEEE Communications Society (2005)Google Scholar
  11. 11.
    Chen, Q., Yang, O.W.W.: On Designing Traffic Controller for AQM Routers Based on Robust u-Analysis. In: IEEE Globecom, pp. 857–861 (2005)Google Scholar
  12. 12.
    Lee, K.M., Yang, J.H., Suh, B.S.: Congestion Control of Active Queue Management Routers Based on LQ-Servo Control. Engineering Letters 16(3), 332–338 (2008)Google Scholar
  13. 13.
    Lee, K.M., Yang, J.H., Suh, B.S.: LQ-Servo Control Design Based on Loop-Shaping Method for TCP/AQM Router. In: The 28th IASTED International Conference on MIC 2009, Innsbruck, Austria, February 16-18 (2009)Google Scholar
  14. 14.
    Athans, M.: Multivarible Control System. Athan’s Control Lecture Note. MIT, CambridgeGoogle Scholar
  15. 15.
    Yang, J.H., Suh, B.S.: A New Loop-Shaping Procedure for the Tuning LQ-PID Regulator. Journal of Chemical Engineering of Japan 40(7), 575–589 (2007)CrossRefGoogle Scholar
  16. 16.
    Marshall, J.E.: Control of Time-Delay Systems. Peter Peregrinus Ltd., Stevenage (1979)zbMATHGoogle Scholar
  17. 17.
    NS-2 Network Simulator, Obtain from

Copyright information

© Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • Ji Hoon Yang
    • 1
  • Seung Jung Shin
    • 2
  • Dong Kyun Lim
    • 3
  • Jeong Jin Kang
    • 4
  1. 1.Department of Electrical EngineeringHanyang UniversitySeoulKorea
  2. 2.Department of Information & TechnologyHansei UniversityGunpo-CityKorea
  3. 3.Department of Computer ScienceHanyang Cyber UniversitySeoulKorea
  4. 4.Department of Information & CommunicationDong Seoul UniversitySeongnam-CityKorea

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