On optimizing CSMA for wide area ad-hoc networks.

François Baccelli 1, 2, 3 Junyi Li Thomas Richardson Sundar Subramanian Xinzhou Wu Sanjay Shakkottai
3 DYOGENE - Dynamics of Geometric Networks
CNRS - Centre National de la Recherche Scientifique : UMR8548, Inria Paris-Rocquencourt, DI-ENS - Département d'informatique de l'École normale supérieure
Abstract : Recent deployments of data-rich smart phones has provided a fresh impetus for designing, deploying and understanding the performance of wide area ad-hoc networks. The most popular medium access mechanism for such ad hoc networks is CSMA/CA with RTS/CTS. In this paper, using tools from stochastic geometry, we study and optimize the through put performance of such networks. We show that in ad-hoc networks enabled with SIR based scheduling, a simple modification to the transmit power level - setting it to be inversely proportional to the square root of the link gain - leads to large improvements in network throughput. This simple power-level selection is optimal over the class of all "local" transmit power selection strategies when channels are stationary, and further is at most a factor of two away from optimality in the fading case. Using stochastic geometric techniques, we also provide analytical expressions for the medium access probability in different scenarios
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Submitted on : Saturday, February 1, 2014 - 6:45:00 PM
Last modification on : Wednesday, January 30, 2019 - 11:07:56 AM


  • HAL Id : hal-00940563, version 1


François Baccelli, Junyi Li, Thomas Richardson, Sundar Subramanian, Xinzhou Wu, et al.. On optimizing CSMA for wide area ad-hoc networks.. WiOpt 2011 - 9th International Symposium on Modeling and Optimization in Mobile, Ad-Hoc and Wireless Networks, May 2011, Princeton, NJ, United States. pp.354-359. ⟨hal-00940563⟩



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