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Modeling the 802.11 Distributed Coordination Function in Nonsaturated Heterogeneous Conditions

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3 Author(s)
Malone, D. ; Hamilton Inst., Nat. Univ. of Ireland, Maynooth ; Duffy, K. ; Leith, D.

Analysis of the 802.11 CSMA/CA mechanism has received considerable attention recently. Bianchi presented an analytic model under a saturated traffic assumption. Bianchi's model is accurate, but typical network conditions are nonsaturated and heterogeneous. We present an extension of his model to a nonsaturated environment. The model's predictions, validated against simulation, accurately capture many interesting features of nonsaturated 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 of interesting traffic types including, in particular, VoIP

Published in:

Networking, IEEE/ACM Transactions on  (Volume:15 ,  Issue: 1 )