臺灣博碩士論文加值系統

近年來由於全球通訊設備及服務市場產值大幅地成長，各國政府均戮力推動通訊網路基礎建設，使得網際網路的各種應用不斷推陳出新；行動通訊技術的發展也在短短的幾年內，從原本的類比式、GSM、進展到目前的第三代(3G)行動通訊網路。由於無線網路與傳統有線網路有很大的差異，因此，以行動網路做為網際網路各種應用服務的平台時，移動性的支援，及滿足多樣化資訊服務品質(Quality of Services)的需求，為實現B3G的重要議題。本論文針對UMTS/GPRS與WLAN結合的B3G異質網路架構，進行連線交遞(Handoff)訊號的傳輸及路由流程、認證互通、漫遊註冊管理，及資料傳送等分析與探討，研究各種不同形式之異質性網路互連架構的優缺點，同時，並提出4種可行的解決方案與在階層式異質性網路下的交握程序。為滿足多樣化資訊服務品質，當一使用者要求無線電資源的時候，將藉由允入控制機制決定此要求是否能夠接受。本論文中提出兩種允入控制演算法：以Channel Busy Ratio與以Frame Loss Rate為基礎的允入控制演算法，以達成服務品質的保證，並研究在使用者人數以及服務品質保證兩者間，如何取得一較佳之平衡點。

目錄
目錄i
圖目錄v
表目錄viii
第一章序論1
1.1前言1
1.2 GPRS介紹2
1.2.1 GPRS無線通訊介面2
1.2.2 GPRS核心網路2
1.3無線區域網路IEEE 802.11介紹3
1.3.1媒體擷取控制(Media Access Control)3
1.4研究動機與目的4
1.5論文章節架構6
第二章異質性網路互連架構與交握程序7
2.1異質性網路架構7
2.1.1對等式異質性網路架構7
2.1.2對等式異質性網路架構之優缺點8
2.1.3階層式異質性網路架構8
2.1.4階層式異質性網路架構之優缺點9
2.2異質性網路架構之建置解決方案10
2.2.1 Scenario Ⅰ10
2.2.2 Scenario Ⅱ11
2.2.3 Scenario Ⅲ12
2.2.4 Scenario Ⅳ13
2.3交握程序14
2.3.1 WLAN系統內之水平交握程序14
2.3.2 由WLAN系統切換至GPRS系統的垂直交握程序16
2.3.3 由GPRS系統切換至WLAN系統的垂直交握程序16
2.4異質性網路架構之信號傳遞流程17
2.4.1 對等式異質性網路架構 ( Scenario Ⅰ )17
2.4.1.1 對等式異質性網路由WLAN系統移動到GPRS系統之垂直交握信號流程17
2.4.1.2對等式異質性網路由GPRS系統移動到WLAN系統之垂直交握信號流程19
2.4.2階層式異質性網路架構 ( Scenario Ⅱ )19
2.4.2.1 階層式異質性網路由WLAN系統移動到GPRS系統之垂直交握信號流程19
2.4.2.2 階層式異質性網路由GPRS系統移動到WLAN系統之垂直交握信號流程21
2.4.3 階層式異質性網路架構 ( Scenario Ⅲ )23
2.4.3.1 階層式異質性網路由WLAN系統移動到GPRS系統之垂直交握信號流程23
2.4.3.2 階層式異質性網路由GPRS系統移動到WLAN系統之垂直交握信號流程24
第三章系統模擬環境35
3.1系統模擬架構與模型35
3.1.1系統模擬架構35
3.1.2系統模擬環境及參數35
3.1.3 Traffic模型37
3.1.4叢發性雜訊通道模型(Burst Noise Error Channel Model)37
3.2系統效能評估39
3.2.1 Throughput40
3.2.2 Delay40
3.2.3 Frame Loss Rate41
3.2.4 結論42
第四章在異質性網路架構中具允入控制機制之交握分析46
4.1無線電資源量測46
4.1.1 Beacon 與Probe Response管理訊框46
4.1.2 Association Request與Reassociation Request管理訊框48
4.2允入控制程序49
4.3允入控制機制49
4.3.1以Channel Busy Ratio為基礎的允入控制機制51
4.3.2以Frame Loss Rate為基礎的允入控制機制52
4.3.3使用RTS/CTS之模擬結果53
4.3.4 Blocking Probability與Request Failure Probability55
4.4 結論56
第五章結論與未來研究方向72
5.1結論72
5.2未來研究方向73
參考文獻74


圖目錄
圖2.1對等式異質性網路架構25
圖2.2階層式異質性網路架構25
圖2.3Scenario Ⅰ26
圖2.4Scenario Ⅱ26
圖2.5Scenario Ⅲ27
圖2.6Scenario Ⅳ27
圖2.7 WLAN系統內之水平交握程序28
圖2.8 由WLAN系統切換至GPRS系統的垂直交握程序28
圖2.9 由GPRS系統切換至WLAN系統的垂直交握程序29
圖2.10 Scenario Ⅰ；由WLAN系統移動到GPRS系統時的垂直交握信號流程30
圖2.11Scenario Ⅰ；由GPRS系統移動到WLAN系統時的垂直交握信號流程30
圖2.12Scenario Ⅱ；由WLAN系統移動到GPRS系統時的垂直交握信號流程31
圖2.13Scenario Ⅱ；由GPRS系統移動到WLAN系統時的垂直交握信號流程32
圖2.14 Scenario Ⅲ；由WLAN系統移動到GPRS系統時的垂直交握信號流程33
圖2.15 Scenario Ⅲ；由GPRS系統移動到WLAN系統時的垂直交握信號流程34
圖3.1 系統模擬架構43
圖3.2 Two-State的連續性馬可夫模型43
圖3.3 叢發性雜訊通道與traffic模型44
圖3.4 系統Throughput44
圖3.5 系統Delay45
圖3.6 系統Frame Loss Rate45
圖4.1 Load Information58
圖4.2 Extended Capabilities58
圖4.3 垂直交握使用者人數與系統Throughput關係圖59
圖4.4 垂直交握使用者人數與系統Throughput關係圖59
圖4.5垂直交握使用者人數與系統Throughput關係圖60
圖4.6垂直交握使用者人數與系統Channel Busy Ratio關係圖60
圖4.7垂直交握使用者人數與系統Channel Busy Ratio關係圖61
圖4.8垂直交握使用者人數與系統Channel Busy Ratio關係圖61
圖4.9 以為基礎之允入控制機制流程圖62
圖4.10垂直交握使用者人數與Frame Loss Rate關係圖63
圖4.11垂直交握使用者人數與Frame Loss Rate關係圖63
圖4.12垂直交握使用者人數與Frame Loss Rate關係圖64
圖4.13 以Frame Loss Rate為基礎之允入控制機制流程圖65
圖4.14 垂直交握使用者人數與系統Throughput關係圖66
圖4.15 垂直交握使用者人數與系統Throughput關係圖66
圖4.16 垂直交握使用者人數與系統Throughput關係圖67
圖4.17垂直交握使用者人數與系統Channel Busy Ratio關係圖67
圖4.18垂直交握使用者人數與系統Channel Busy Ratio關係圖68
圖4.19垂直交握使用者人數與系統Channel Busy Ratio關係圖68
圖4.20垂直交握使用者人數與Frame Loss Rate關係圖69
圖4.21垂直交握使用者人數與Frame Loss Rate關係圖69
圖4.22垂直交握使用者人數與Frame Loss Rate關係圖70
圖4.23 BP、RFP與Residential time關係圖70
圖4.24 BP、RFP與Residential time關係圖71


表目錄
表3.1系統模型參數36
表3.2叢發性雜訊通道模型參數39

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