Malone, David and Duffy, Ken R. and Leith, Douglas J.
(2005)
Modeling the 802.11 Distributed Coordination
Function with Heterogenous Finite Load.
In: Workshop on Resource Allocation in Wireless NETworks (RAWNET 2005), 3 April 2005, WiOpt, Trento.
Abstract
Analysis of the 802.11 CSMA/CA mechanism has
received considerable attention recently. Bianchi [1] presents an
analytic model under a saturated traffic assumption. Bianchi’s
model is accurate, but typical network conditions are nonsaturated
and heterogenous. We present an extension of his
model to a non-saturated environment. The model’s predictions,
validated against simulation, accurately capture many interesting
features of non-saturated operation. For example, the model
predicts that peak throughput occurs prior to saturation. Our
model allows stations to have different traffic arrival rates,
enabling us to address the question of fairness between competing
flows. Although we use a specific arrival process, it encompasses
a wide range interesting traffic types including, in particular,
VoIP.
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