臺灣博碩士論文加值系統

隨著無線網路技術的發展，行動裝置逐漸普及。為了應付行動裝置使用者上網的需求，大量的無線網路存取點(Access Point)被建置在環境中，一個行動裝置常常可以同時偵測到多個可供使用的無線網路。一般都是根據訊號的強度由使用者手動或是連線軟體自動選擇訊號最強的網路做連線。
有鑑於未來的4G環境中存在各種不同的網路環境，各種網路又有其專屬的網路接取技術，而感知網路(Cognitive Network)的提出就是希望在這種環境下解決使用者的兩大問題，在各種網路間做無接縫換手以保持服務的不中斷與使用者導向的連線選擇機制。
在本論文中將會在感知網路的架構下提出一個跨層式的無線感知網路多重連線機制。其中包括利用頻譜感知與頻譜配置的能力配合結合SIP與mSCTP的跨層式換手機制達到最佳化網路選擇與網路的無接縫換手。在機制中也定義了一個感知網路模組，可以讓使用者設定自己的偏好以及其他條件達到使用者導向的連線選擇機制。

With the development of wireless network technology, mobile device has become more popular. In order to deal with the demand of accessing the Internet for mobile users, massive access points has been established and deployed in mobile network. Thus, a mobile may simultaneously detect available access networks it can use. It is an important issue to choose the proper access network to connect for obtaining better communicating service.
In future 4G mobile network, it may integrate different types of mobile network, e.g., WiFi, UMTS, WiMAX, etc.. Each network has its own access technology. Cognitive Network can provide a cognitive mechanism to solve two issues. One is seamless handoff between networks to keep service continued and the other is user oriented link selection mechanism.
In this thesis, we proposed a cross-layer designed wireless multihoming mechanism based on cognitive network architecture. Which includes the various technologies, e.g., spectrum sensing and spectrum allocation to choose the proper wireless communication links. We also adopts mSCTP (Mobile SCTP) to reach the optimization of access network selection and seamless handoff.

摘要 I
Abstract II
目錄 III
圖目錄 IV
表目錄 VI
第一章 緒論 1
1.1 研究背景 1
1.2 研究動機與目的 3
1.3 論文架構 4
第二章 文獻探討 6
2.1 感知網路之研究 6
2.2 Mobility Management之研究 13
2.2.1 Mobile IP 13
2.2.2 SIP re-INVITE機制 16
2.2.3 Mobile SCTP 21
2.3 Multihoming 24
2.4 問題探討 26
第三章 跨層式感知網路多重連線機制 28
3.1 4G無線感知網路環境 28
3.2 軟體定義無線電 29
3.3 換手門檻評估 31
3.4 跨層式感知網路換手機制 34
3.3.1 頻譜感知 36
3.3.2 換手預備 37
3.3.3 服務換手 38
3.3.4 連線換手 39
第四章 實驗結果與分析 41
4.1 實驗架構 41
4.2 實驗設計 45
4.3 結果分析 46
第五章 結論與未來展望 54
參考文獻 56

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