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Temporal Spectrum Sharing in Heterogeneous Wireless Networks: (English)

Temporal Spectrum Sharing in Heterogeneous Wireless Networks: (English)

          
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About the Book

Due to the rapid deployment of wireless devices the spectrum for wireless communication is getting crowded. Almost the entire usable spectrum has already been licensed and assigned by the FCC (Federal Communications Commission) suggesting spectrum scarcity in near future. Numerous measurements, however, have shown that most of the allocated licensed spectrum is not efficiently used. To overcome this inefficiency, the FCC is considering new paradigms in which licensed users should be able to share the spectrum with secondary users. In this thesis, we propose a new model for spectrum sharing, in which secondary users opportunistically utilize the time gaps in the spectrum usage of primary users. In the first part of the thesis, we study the fundamental utilization tradeoff between primary and secondary users in our temporal spectrum sharing model. We first introduce an interference tolerance constraint that limits the harmful effects of interference on licensed users. We then formulate a constrained optimization problem to derive the maximum attainable secondary utilization under the introduced interference constraint. This optimization problem can be numerically solved by considering a typical scenario. Using this scenario, we study the effects of different design parameters on secondary utilization. Finally, we propose optimal threshold selection and variable sample size detection, as two methods of improving the utilization tradeoff curves. In the second part of the thesis, we expand our model of temporal spectrum sharing to unlicensed bands. More specifically, we focus on dynamic channel selection as a means of improving the attainable utilization through spectrum-agility. We show that the optimal channel selection problem can be formulated as a multi-armed bandit problem enabling us to derive the channel selection rules. The model assumptions about the interfering traffic that motivates this formulation are also validated through traffic measurement of an 802.11-based network, as an example of a packet-switched network in the unlicensed band. Finally, protocol simulations are used to show that the proposed algorithm consistently tracks the best channel compared to other heuristic schemes.


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Product Details
  • ISBN-13: 9781243550170
  • Publisher: Proquest, Umi Dissertation Publishing
  • Publisher Imprint: Proquest, Umi Dissertation Publishing
  • Height: 246 mm
  • No of Pages: 102
  • Series Title: English
  • Weight: 195 gr
  • ISBN-10: 1243550171
  • Publisher Date: 01 Sep 2011
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Spine Width: 5 mm
  • Width: 189 mm


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