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      • Department of Electrical and Electronics Engineering
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      Effect of Network Density and Size on the Short-Term Fairness Performance of CSMA Systems

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      Author
      Koseoglu, M.
      Karasan, E.
      Alanyali, M.
      Date
      2012
      Source 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
      Article
      Item Usage Stats
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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.
      Keywords
      Optimal random-access
      Delay
      Efficient
      Permalink
      http://hdl.handle.net/11693/11938
      Published Version (Please cite this version)
      http://dx.doi.org/10.​1186/​1687-1499-2012-367
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      • Department of Electrical and Electronics Engineering 3524
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