Constructive output feedback AQM design

Yi Fan, Zhong Ping Jiang, Shivendra Panwar, Hao Zhang, Xingxing Wu

Research output: Contribution to journalConference articlepeer-review


A novel constructive output feedback congestion controller is presented for asymptotically stabilizing a class of TCP networks at a desired operating point. An observer for the TCP window size is proposed to aid the task of designing AQM controller with only the output (queue size) measurement. Conditions under which the TCP window estimation converges to the true window size is related to the persistent excitation (PE) condition of the control input. Observer-based backstepping design technique is applied for developing the control law, in the presence of amplitude limits on the control input-packets dropping or marking ratio must fall between 0 and 1. An estimation of the domain of attractiveness is provided by a Lyapunov level set.

Original languageEnglish (US)
Pages (from-to)3360-3365
Number of pages6
JournalProceedings of the American Control Conference
StatePublished - 2005
Event2005 American Control Conference, ACC - Portland, OR, United States
Duration: Jun 8 2005Jun 10 2005


  • AQM
  • Congestion control
  • Output feedback
  • Persistent excitation
  • TCP

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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