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  • 學位論文

無線感知網路之排程策略

Scheduling Mechanism in Wireless Cognitive Network

指導教授 : 葛煥昭

摘要


本論文中,筆者首先介紹了有關感知網路和其相關技術研究。本研究包含了一個應用於感知網路的可適性排程機制(簡稱ASCN),在動態頻譜偵測的運作下設計一個新型排程器讓次要使用者能有有效運用頻道裡主要使用者沒有運用的閒置資源,即時傳輸和非即時傳輸均在本論文的考慮範圍內。同時建立了優先權的排序方法,以延遲程度和資源獲取做為依據、用動態調整優先權的方式來降低系統的延遲程度。最後提出緊急佇列的概念,視各個連線的狀況來判斷是否需要進入緊急佇列以避免飢餓狀態的發生並且維持連線傳輸間的公平性。本論文的主要貢獻即是考量次要使用者於感知網路資源缺乏的情況下能夠兼顧傳輸效能外能妥善分配閒置資源並且符合傳輸的公平性、降低平均延遲程度、減少飢餓的情形。

關鍵字

感知網路 公平性 排程 延遲 飢餓 緊急佇列

並列摘要


Recent advances in cognitive networks have increased the importance of scheduling. This study sought to enhance the fairness and decrease latency of cognitive networks by introducing and efficient scheduling algorithm capable of starvation and latency without sacrificing lower priority connections. Numerical results demonstrate that compare with others algorithm, it truly improved the starvation and latency problems. It helps real time connection with the lack of resources.

並列關鍵字

Cognitive Fairness Scheduling Latency Starvation Emergency Queue

參考文獻


[1] S Haykin, “Cognitive Radio: Brain-Empowered Wireless Communications,”IEEE J. Selet. Areas Commun., vol.23, pp. 201-220, Feb. 2005.
[2] P. Demestichas, G. Dimitrakopoulos, J. Strassner, and D. Bourse, “Introducingreconfigurability and cognitive networks concepts in the wireless world”, IEEEVehicular Technology Magazine June 2006.
[4] C.Cordeiro, K. Challapali, D. Birru, Shankar Sai, “IEEE 802.22: the firstworldwide wireless standard based on cognitive radios”, IEEE DySPAN Nov2005.
[5] I.F. Akyildiz, W.-Y. Lee, M. C. Vuran *, S. Mohanty, “Next generation/ dynamicspectrum access/cognitive radio wireless networks: a survey,” ComputerNetworks Journal, (Elsevier), Vol. 50, no. 13 Sep. 2006.
[6] X. Liu and S. Shankar N., “Sensing-based opportunistic channel access,”Journalof Mobile Networks and Applications, Volume 11, Number 4,August 2006,pp.577–591.

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