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研究生: 尤秀
Yu, Hsiu
論文名稱: 在感知無線電點對點傳輸網路中能隨地域特性變化之控制通道配置機制
Spatially Varied Control Channel Assignment in Cognitive Radio Ad Hoc Networks
指導教授: 斯國峰
Ssu, Kuo-Feng
學位類別: 碩士
Master
系所名稱: 電機資訊學院 - 電腦與通信工程研究所
Institute of Computer & Communication Engineering
論文出版年: 2011
畢業學年度: 99
語文別: 英文
論文頁數: 52
中文關鍵詞: 感知無線電控制通道地域相似性
外文關鍵詞: cognitive radio, control channel, spatial similarity
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  • 在感知無線電點對點傳輸網路中,為了使控制訊息交換更為便利,需要一個總是可用的控制通道。繼承感知無線電網路之特徵,使用者之可用通道集合有隨著時間與空間變化的特性,使用者很難在規劃使用的通道集合中找到一個全體使用者皆可用的控制通道,因此動態地配置區域性控制通道是較適切的。利用鄰近使用者可用通道集合之地域相似性,本篇論文提出一個能隨地域特性變化的控制通道配置機制。使用者相信若他與他的鄰居使用同樣的方式評選通道,則他們會自然地選擇相同的控制通道。因此每個使用者個別地觀察環境中的通道特性,並且不需要和鄰居交換訊息即能選擇合適的控制通道。本篇論文提出之控制通道配置機制具可擴展性,且能在主要使用者重新開始使用通道時,立即決定出新的控制通道。除此之外,論文中也介紹了一個簡單有效的鄰近使用者搜索機制來解決大多數控制通道配置機制需要事先得知鄰近使用者之資訊的問題。

    In order to ease the control message exchange, a constantly available control channel is demanded in cognitive radio ad hoc networks. Due to the characteristics of the cognitive radio network, available channel sets vary with both time and space. A globally fixed in-band control channel is not always ready to use, so a local and dynamic control channel is more preferred. In this thesis, a spatially varied control channel assignment scheme, called SVC, is developed. SVC takes advantage of the spatial similarity among the available channel sets which neighboring secondary users hold. The secondary users believe that their neighbors would have the same control channel choices as theirs if they value the channels in the same way. Each user can observe the environment and make the decision independently. As a result, SVC is scalable and has the ability to recover immediately from the sudden appearance of primary users. Besides, a simple neighbor discovery mechanism is also introduced to solve the problem that most of the control channel assignment schemes require neighbor information in advance.

    1 Introduction . . . . . . . . . .1 1.1 Cognitive Radio Networks . . . . . . . . . .1 1.2 Control Channel Assignment . . . . . . . . . .2 2 Related Work . . . . . . . . . . 6 3 System Overview . . . . . . . . . . 9 4 Spatial Similarity. . . . . . . . . . 12 5 Spatially Varied Control Channel Assignment . . . . . . . . . .18 5.1 Initialization . . . . . . . . . .18 5.2 Neighbor Discovery . . . . . . . . . .21 5.3 Mode Selection . . . . . . . . . . 26 5.4 Control Channel Migration . . . . . . . . . .27 6 Transmission . . . . . . . . . .31 7 Simulation Results . . . . . . . . . .37 7.1 Cluster Size . . . . . . . . . . 37 7.1.1 Scenario Analysis. . . . . . . . . .37 7.1.2 Random PU Deployment. . . . . . . . . .41 7.2 Transmission Delay. . . . . . . . . . 44 8 Conclusion and Future Work. . . . . . . . . .47 8.1 Conclusion . . . . . . . . . . 47 8.2 Future Work . . . . . . . . . . 48 References . . . . . . . . . .50 Vita. . . . . . . . . . 52

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