An application of the control theoretic modeling for a scalable TCP ACK pacer

Yishen Sun*, Chung Chieh Lee, Randall A Berry, Abraham Herzl Haddad

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations


In this paper, we present the design of a TCP ACK pacer which regulates the downstream buffer occupancy at an edge router in the Internet to avoid Quality of Service (QoS) damaging congestion while maximizing the link utilization. This technique has the advantage of requiring no changes in existing TCP implementations. Based on a feedback system representation of the network, a PI-type controller is proposed to determine the aggregate ACK releasing rate according to the buffer occupancy. This approach is scalable in that it requires no per-flow state information. The robustness of the controller is addressed with respect to the system uncertainty such as the traffic dynamics and the system delay. Generalizations of the control objective are discussed as well. A special case of the controller, corresponding to a proportional plus lag compensator is analyzed and used to provide a systematic approach for satisfying a given delay requirement. Numerical examples to illustrate this approach are also given.

Original languageEnglish (US)
Title of host publicationProceedings of the 2004 American Control Conference (AAC)
Number of pages6
StatePublished - Nov 29 2004
EventProceedings of the 2004 American Control Conference (AAC) - Boston, MA, United States
Duration: Jun 30 2004Jul 2 2004


OtherProceedings of the 2004 American Control Conference (AAC)
Country/TerritoryUnited States
CityBoston, MA

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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