SIGMETRICS '05 Proceedings of the 2005 ACM SIGMETRICS international conference on Measurement and modeling of computer systems
Rendered path: range-free localization in anisotropic sensor networks with holes
Proceedings of the 13th annual ACM international conference on Mobile computing and networking
Traffic capacity of multi-cell WLANS
SIGMETRICS '08 Proceedings of the 2008 ACM SIGMETRICS international conference on Measurement and modeling of computer systems
IEEE Transactions on Wireless Communications
Performance analysis of the IEEE 802.11 distributed coordination function
IEEE Journal on Selected Areas in Communications
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Most of analysis so far for IEEE 802.11(e) WLANs focuses on saturated condition. But it is of practical value to take into account the unsaturation case. In this paper, we extend Bianchi's Markov back-off model to unsaturated condition but analyze it using renewal-reward theorem. In this more general framework, we study the fixed point solution of the system and provide a condition to guarantee both the uniqueness and balance of the fixed point. From the fixed point analysis we find that under unsaturated condition, network parameters should be designed according to the traffic load in order to avoid short-term unfairness or multistability. Then, we study the system throughput. Furthermore, in an asymptotic regime with a large number of nodes, we provide explicit formulas for the collision probability, the aggregate attempt rate and the aggregate throughput. All of our analysis based on unsaturated condition is the generalized analysis which can be applied to saturated condition as well. We provide the validation of our analysis through ns2 simulations.