臺灣博碩士論文加值系統

以SIM為基礎之認證機制來整合GPRS與WLAN網路，是比較被GPRS業者所接受的整合方法。此種方法必須在WLAN系統中執行GPRS的認證機制，並且在WLAN網路中將GPRS的認證訊息送回GPRS內部網路處理，我們稱為以GPRS為中心之整合方法。本篇論文則是提出了另一種以WLAN為中心的方法來整合GPRS與WLAN，並且是基於WLAN業者的角度而不是GPRS業者。本論文所提出的WLAN為中心之認證機制，相反地，是以WLAN為基礎之認證機制來整合兩系統，並且須要GPRS業者在其網路中安裝一個AAA伺服器。此方法是建構在一個鬆散結合的網路架構中，此外，我們假設此架構中的GPRS與WLAN是兩個獨立平行運作的網路，因此擁有各自的認證機制。本篇論文中，我們將針對各種不同的漫遊情形來做討論，亦即是對GPRS的用戶與WLAN使用者在兩個系統中漫遊時的所有情況來探討，並且詳述我們所提出之解決方法。我們也將所提出的整合方法實作在一個測試平台上，此測試平台包含了GPRS與WLAN的系統，並且透過實際的測試與實驗來分析其效能。

A SIM-based authentication is preferable for GPRS operators for the integrated GPRS-WLAN networks. It requires WLAN system process the GPRS-based authentication and transport the GPRS authentication messages back to the GPRS networks. This thesis presents an alternative WLAN-centric approach based on the perspective of WLAN providers. The proposed WLAN-centric authentication instead leverages the widely used WLAN-based authentication and requires the GPRS operator install an AAA (Authentication, Authorization, and Accounting) server. The proposed approach is based on loose coupling architecture. In addition, it assumes that the GPRS and WLAN systems are two parallel networks and work independently. Scenarios for GPRS subscribers and WLAN users roaming between two systems are detailed. The proposed approach is implemented in a GPRS and WLAN testbed, which comprises most of the components in GPRS and WLAN systems. Performance analysis based on empirical experiments is also discussed.

Acknowledgments
Abstract
List of Tables
List of Figures
1. Introduction
1.1. Diameter Protocol
1.1.1. Security Issues in RADIUS
1.1.2. Overview of Diameter Base Protocol
1.1.3. Diameter EAP Application
1.2. Standard GPRS Attach Procedure
1.2.1. GPRS Authentication Procedure
1.2.2. GPRS Encryption Procedure
1.3. Organization of the Thesis
2. Related Work
2.1. Introduction
2.2. 3GPP Interworking Models
2.3. ETSI Interworking Architectures
2.4. Motorola's Solution
2.5. Nokia's Solution
2.6. Summary
3. Diameter 802.1X Application
3.1. Introduction
3.2. Proposed Diameter 802.1X Application
3.3. Summary
4. WLAN-centric Authentication
4.1. Introduction
4.2. System Architecture
4.3. GPRS Subscribers Roam into WLAN System
4.4. WLAN Users Roam into GPRS System
4.5. Requirements for MS
4.6. Requirements for WLAN System
4.7. Requirements for GPRS System
4.8. Comparisons With GPRS-centric Approach
4.9. Billing Considerations
4.9.1. Billing for GPRS Subscribers Roam into WLAN Networks
4.9.2. Billing for WLAN Users Roam into GPRS Networks
4.10. Summary
5. Testbed and Experiments
5.1. Introduction
5.2. Testbed Architecture
5.3. Implementation of Diameter 802.1X Application
5.4. Experiments and Analysis
5.5. Summary
6. Conclusions
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