Article

A Simple Critical-Load-Based CAC Scheme for IEEE 802.11 DCF Networks

Fac. of Inf. Technol., Macau Univ. of Sci. & Technol., Macau, China
IEEE/ACM Transactions on Networking (impact factor: 2.03). 11/2011; DOI:10.1109/TNET.2011.2116801 pp.1485 - 1498
Source: IEEE Xplore

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.

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Keywords

ad hoc
 
asymptotic analysis
 
complex calculations
 
coordination function
 
critical traffic load
 
network performance measurements
 
nonsaturated traffic types
 
practical call admission control
 
proposed CAC scheme
 
proposed scheme
 
salient feature
 
simple
 
voice capacity
 

Qinglin Zhao