A simple critical-load-based CAC scheme for IEEE 802.11 DCF networks

Authors:
Qinglin Zhao;Danny H. K. Tsang;Taka Sakurai
Affiliations:
Faculty of Information Technology, Macau University of Science and Technology, Taipa, Macau, China;Department of Electronic and Computer Engineering, Hong Kong University of Science and Technology, Kowloon, Hong Kong;Department of Electrical and Electronic Engineering, The University of Melbourne, Melbourne, VIC, Australia
Venue:
IEEE/ACM Transactions on Networking (TON)
Year:
2011

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Abstract

This paper proposes a simple and practical call admission control (CAC) scheme for one-hop IEEE 802.11 distributed coordination function (DCF) networks in heterogeneous environments. The proposed scheme is the first CAC scheme derived from an asymptotic analysis of the critical traffic load, where the critical traffic load represents the threshold for queue stability. The salient feature of our CAC scheme is that it can be performed quickly and easily without the need for network performance measurements and complex calculations. Using the proposed scheme, we specifically investigate the voice capacity of 802.11 DCF networks with unbalanced traffic. Extensive simulations covering both ad hoc and infrastructure-based networks, and a variety of nonsaturated traffic types, show that the proposed CAC scheme is very effective.