Abstract
White spaces promise to revolutionize the way wireless connectivity is delivered over wide areas. However, large-scale white space networks face the problem of allocating channels to multiple contending users in the wide white space band. To tackle the issue, we first examine wireless propagation in a long-distance outdoor white space testbed and find that a complex combination of free-space loss and antenna effects impacts transmission in white spaces. Thus, a need arises for a strategy that goes beyond simple channel utilization balancing, and uses frequency probing to profile channels according to their propagation properties. We devise VillageLink, a Gibbs sampling-based method that optimizes channel allocation in a distributed manner with a minimum number of channel switching events. Through extensive simulations we demonstrate that VillageLink results in a significant capacity improvement over alternative solutions.
This chapter is an extension of V. Pejovic, D. L. Johnson, M. Zheleva, E. M. Belding and A. Lysko, VillageLink: Wide-Area Wireless Coverage, COMSNETS’14, Bangalore, India, January 2014.
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Notes
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We envision OFDMA channel sharing among the CPEs of a BS. Such an approach is mandated by IEEE 802.16 and IEEE 802.22 standards. We leave the details of subcarrier allocation as the future work, and in this paper concentrate solely on channel allocation at the BS level.
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Convergence in variation describes convergence of an array of samples to a probability distribution and is defined in [1], p. 128.
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Pejovic, V., Johnson, D.L., Zheleva, M., Belding, E.M., Lysko, A. (2015). VillageLink: A Channel Allocation Technique for Wide-Area White Space Networks. In: Mishra, A., Johnson, D. (eds) White Space Communication. Signals and Communication Technology. Springer, Cham. https://doi.org/10.1007/978-3-319-08747-4_9
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