Effect of Network Density and Size on the Short-Term Fairness Performance of CSMA Systems
Author
Koseoglu, M.
Karasan, E.
Alanyali, M.
Date
2012Source Title
EURASIP Journal on Wireless Communications and Networking
Print ISSN
1687-1499
Publisher
Springer Open Journal
Volume
2012
Issue
367
Pages
2 - 15
Language
English
Type
ArticleItem Usage Stats
111
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Abstract
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.