臺灣博碩士論文加值系統

未來的無線網際網路是藉由各種異質的無線網路技術來提供使用者存取網路上的資訊與服務。目前無線網路技術多元且特性各異，不同技術所提供的傳輸速率與涵蓋範圍都不盡相同。而以IP為基礎的核心網路整合異質無線網路將是未來趨勢，也產生了許多新的挑戰，其中，最重要的議題便是如何提供有效的移動管理機制。然而若採用Mobile IP作為移動管理機制，其應用作為整合異質網路中移動管理會產生包括三角繞送問題與位置管理成本增加等問題。而針對三角繞送問題雖已有Route Optimization提出解決方法，但其卻未提供良好的Mobility Binding Cache管理機制。本論文在IP-Based Core Network整合異質無線網路架構下，設計有效率的移動管理機制，利用Multiple CoA管理MN位置避免不必要的註冊並降低相關成本；使用Mobility Binding Cache降低CN傳送資料給MN的繞送成本；並以Lagrange插值法預測CN傳送資料的間隔時間，以提供動態更新Cache來提高Cache Hit Ratio並降低位置更新成本。由模擬結果可以看出，較諸於Mobile IP與Route Optimiation，在異質無線網路下，本論文提出的移動管理機制，能夠有效繞送封包，有效降低註冊延遲，並大大降低位置管理的成本。

With the rapidly growing demand for anywhere anytime Internet access, many advanced networking and radio technologies have already been developed. Integration of these different technologies is a vital trend in the future. The mobility management issue becomes very pressing in such a heterogeneous environment. Mobile IP and Route Optimization are the most widely known mobility management schemes in mobile networks. However, some inherent drawbacks of these protocols are partially solved. In this thesis, the Multiple CoA Scheme is proposed to reduce the registration costs caused by frequent registrations when the MN moves around in the overlapped area. Also, to remedy the notorious triangle routing, a copy of mobility binding is kept at the CN. The proposed scheme can precisely predict when the binding cache at the CN should be updated to keep the binding satisfyingly refreshed. The data routing costs are significantly reduced. The simulation results show that the mobility management scheme proposed in this thesis outperforms both Mobile IP and Route Optimization in IP based heterogeneous wireless networks.

摘要 i
Abstract ii
誌謝 iii
目錄 iv
圖目錄 viii
表目錄 xiv
第一章 簡介 1
1.1 研究動機 1
1.2 研究目標 3
1.3研究貢獻 4
1.4 章節架構 5
第二章 相關文獻研究 6
2.1 無線擷取網路系統 6
2.1.1行動個人通信系統 6
2.1.2無線電腦網路系統 7
2.2 移動管理機制 9
2.2.1 鏈結層 9
2.2.2 網路層 10
2.2.3 傳輸層 12
2.2.4 應用層 13
2.3 異質網路下的移動管理 15
2.3.1 SIP-based mobility management 16
2.3.2 MIP-based mobility management 17
第三章 系統概觀 19
3.1 問題描述 20
3.2 系統架構 21
3.3 移動管理機制 23
3.3.1異質網路下的移動管理機制 23
3.3.2 不同移動類型 29
3.4 Mobility Binding Cache管理機制 55
3.4.1 Mobility Binding管理 56
3.4.1.1 由HA發送Binding Update 訊息 (HSBU) 57
3.4.1.2 由MA發送Binding Update 訊息 (MSBU) 59
3.4.2 Binding Update Message發送時機 61
3.5 資料結構 66
第四章 實驗模擬與結果分析 69
4.1 實驗目的 69
4.2 模擬平台與環境 70
4.3 實驗設計與結果分析 72
4.3.1 在異質網路環境下使用MIP以及MCoA不同移動管理對於系統效能的影響 72
4.3.2在異質網路環境下使用MIP以及MCoA兩種不同移動管理機制的註冊延遲的比較 76
4.3.5 選擇Threshold Scheme的Threshold數值大小 87
4.3.6 MSBU Scheme方法中Binding Update Message發送方式的效能影響 89
4.3.7 Adaptive Scheme採用不同插值法預測CN傳送資料間隔時間對於系統效能影響 91
4.3.8 MSBU Scheme方法中使用不同差值法來預測CN傳送資料間隔時間的準確度 93
4.3.9 不同CMR對於採用不同Binding Update Scheme的效能影響 95
4.3.10在不同網路拓樸環境下各種移動類型發生的機率 97
4.4 實驗結果討論 103
第五章 結論與未來工作 105
5.1 結論 105
5.2 未來工作 106
參考文獻 107

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