Analysis and design of admission control systems in web-server systems

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All service control nodes, for example Web sites or Mobile Switching Centers, can be modeled as server systems with one or more servers processing the incoming requests. To avoid overload at the service control node different types of admission control mechanisms are usually implemented. In this paper we discuss, from a control point of view, the modeling of a service control-node. The queue is assumed to be an M/G/1-system and is modeled by a nonlinear flow model and a simplified discrete-time model is used in the analysis and design of the system. An admission control system based on a PI-controller combined with an anti-reset windup feature is developed. The stability of the admission control system is analyzed and the stability of the closed loop system is proved. The results from the simplified queue model are verified through discrete-event simulations of the system.
Original languageEnglish
Title of host publicationProceedings of the 2003 American Control Conference. Vol. 1
PublisherIEEE - Institute of Electrical and Electronics Engineers Inc.
ISBN (Print)0-7803-7896-2
Publication statusPublished - 2003
EventAmerican Control Conference, 2003 - Denver, CO, United States
Duration: 2003 Jun 42003 Jun 6

Publication series

ISSN (Print)0743-1619


ConferenceAmerican Control Conference, 2003
Country/TerritoryUnited States
CityDenver, CO

Subject classification (UKÄ)

  • Control Engineering
  • Communication Systems


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