Effect of network density and size on the short-term fairness performance of CSMA systemsReport as inadecuate

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EURASIP Journal on Wireless Communications and Networking

, 2012:367

First Online: 23 December 2012Received: 31 July 2012Accepted: 29 November 2012


As the penetration of wireless networks increase, number of neighboring networks contending for the limited unlicensed spectrum band increases. This interference between neighboring networks leads to large systems of locally interacting networks. We investigate whether the short-term fairness of this system of networks degrades with the system size and density if transmitters employ random spectrum access with carrier sensing CSMA. Our results suggest that a short-term fair capacity, which is the throughput region that can be achieved within the acceptable limits of short-term fairness, reduces as the number of contending neighboring networks, i.e., degree of the conflict graph, increases for random regular conflict graphs where each vertex has the same number of neighbors, b short-term fair capacity weakly depends on the network size for a random regular conflict graph but a stronger dependence is observed for a grid deployment. We demonstrate the implications of this study on a city-wide Wi-Fi network deployment scenario by relating the short-term fairness to the density of deployment. We also present related results from the statistical physics literature on long-range correlations in large systems and point out the relation between these results and short-term fairness of CSMA systems.

Electronic supplementary materialThe online version of this article doi:10.1186-1687-1499-2012-367 contains supplementary material, which is available to authorized users.

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Author: Mehmet Koseoglu - Ezhan Karasan - Murat Alanyali

Source: https://link.springer.com/

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