• 沒有找到結果。

在這篇論文中,我們介紹無線感知雲端網路的概念,並且對其發展可 能性及架構做了初步發想與介紹,其中我們針對在無線感知雲端上頻譜管 理進行研究,希望藉由地區的平行化,加速整體在雲端上的運作速度,我 們在本篇論文中,探討各種分群的可能(最佳化分群、最大代價分群及平衡 負載分群),提出了理論證明、時間複雜度分析及模擬數據結果。對於分群 過後因為資訊缺乏的原因,可能導致邊界無線感知網路基地台的彼此干擾 的問題,我們進一步的提出解決方案,將邊界無線感知網路基地台做初步 的頻譜資源分配,本篇論文提出兩種頻譜資源分配方法(最佳化資源分配,

啟發性的資源分配)以理論證明其最佳性,以時間複雜度及模擬數據結果分 析並驗證其可行性。

在未來,我們將著手於實做無線感知雲端網路,將分群法及邊界的資 源分配演算法實做於真實的雲端平台,並結合功率配置來完整實做頻譜管 理運算單元於雲端上,更進一步的在雲端上結合頻譜感測及換手管理,期 望將無線感知雲端網路的概念實做於生活之中,為未來的生活型態提出新 的可能。

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參考文獻

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[6] S.-H. Wu, H.-L. Chao, C.-T. Jiang, S.-R. Mo, C.-H. Ko, T.-L. Li, C.-F. Liang, and C.-C. Cheng, “A conceptual model and prototype of cognitive radio cloud networks in TV white spaces,” Proceedings of IEEE Wireless Communications and Networking Conference (WCNC), Wireless Cloud and White Space Oriented Networks workshop, pp. 425-430, Apr. 2012.

[7] S.-H. Wu, H.-L. Chao, C.-H. Ko, S.-R. Mo, C.-T. Jiang, T.-L. Li, C.-F. Liang, and C.-C. Cheng, “A cloud model and concept prototype for cognitive radio networks,” IEEE Wireless Communications Magazine, vol. 19, pp. 49-58, 2012.

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[12] S. T. Barnard, H. D. Simon, “A fast multilevel implementation of recursive spectral bisection for partitioning unstructured problems,” Proceedings of SIAM Conference on Parallel Processing for Scientific Computing, pp. 711-718, 1993.

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附錄一、工作量產生方式(Loading Generation)

Power allocation engine loading : M : Number of channels

L : Number of APs k : Number of users

(A) Optimal power allocation : If k < ML, f(1)=1, f(2)=2

f(k) = 1 + C2kf(k − 2) + C3kf(k − 3) + ⋯ + Ck−1k f(1) + 1 Computation complexity = f(k)*O(L3)

(B) Suboptimal power allocation : If k ≤ ML,

Computation complexity = (ML + (k − 1)(ML)212ML(k2− k)) ∗ O(L3)

詳細內容請參閱 C.-C. Cheng, “Feasibility Assessment for A Cloud-Based Cognitive Radio Mobile Network - A Power Perspective,” Master thesis, Institute of Communications Engineering, National Chaio Tung University, 2012.

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