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Feedback based Distributed Admission Control in 802.11 WLANs

Summary: Feedback based Distributed Admission Control in
802.11 WLANs
Preetam Patil, Vipul Mathur, Varsha Apte and Kannan Moudgalya
Indian Institute of Technology­Bombay
Powai, Mumbai, Maharashtra 400076, India
Email: {pvpatil,vipulmathur,varsha,kannan}@iitb.ac.in
Abstract--A distributed connection admission control (CAC)
scheme where stations independently admit or reject flows based
on channel utilization threshold is easy to implement for WLANs.
However, owing to variable protocol capacity, the advisable
threshold also is variable, limiting the efficacy of fixed threshold
based CAC. If the admission threshold is tuned to reflect the
current protocol capacity, better throughput can be obtained
while avoiding WLAN overload. In this paper, we propose a
feedback based scheme to tune the utilization threshold for
admission. We select the performance metric used for feedback,
derive the system model from empirical data, and use control
theory to design a feedback controller. Further, we present an
analytical model and heuristics using which the controller can be
adapted to work under diverse operating scenarios. Simulation


Source: Apte, Varsha - Department of Computer Science and Engineering, Indian Institute of Technology Bombay


Collections: Computer Technologies and Information Sciences