臺灣博碩士論文加值系統

近年來，為了提升室內收訊品質、傳輸速率、更佳的使用經驗，Femtocell被提出並且熱烈的討論。Femtocell就像是一個室內的基地台，但它使用極小的功率來發射電磁波，目的在於提升室內的收訊品質。與室外基地台不同的地方在於，它的後端無須與電信業者的機房直接連接，而是透過家裡的網路線來連接至電信業者的系統。然而，現存的電信系統五花八門，對於某一電信業者來說，可能同時有2.5G、3G、4G的系統同時存在，然而Femtocell該如何接取到後端不同的系統，有很多的方法已經被提出。在這篇論文中，我們選用了IMS-Based的接取方式來連接至電信業者的系統，然而，Femtocell透過IMS-Based方法連接至電信業者系統的相關規定尚未標準化。因此，我們基於撥號通話的服務，設計了一套手機與IMS通訊的撥號流程，並且透過設計與實作Femtocell，驗證了該流程的可行性。此外，我們也透過模擬比較了各種不同撥號流程的效能。

Contents
Abstract i
Contents i
List of Figures iv
1 Introduction 1
2 Background Information 5
2.1 IMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2 SIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 Proposed Call Procedure 8
3.1 Call Procedure of 3GPP Call Control . . . . . . . . . . . . . . . . . . . . . 8
3.2 Call Procedure of IMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.3 Mappping between CC and IMS messages . . . . . . . . . . . . . . . . . . 12
3.4 Enhanced Call Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4 Design of The IMS-Based Femtocell 18
4.1 Protocol stack of IMS-based femtocell . . . . . . . . . . . . . . . . . . . . . 18
4.2 Software architecture of IMS-based femtocell . . . . . . . . . . . . . . . . . 18
4.3 Flow chart of the IMS-based femtocell . . . . . . . . . . . . . . . . . . . . 21
5 Testbed 22
5.1 Components Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.2 Wireshark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.3 Demonstration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6 Performance Evaluation 29
6.1 Simulation Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
6.2 Simulation Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
6.3 Simulation Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
6.4 Simulation Result . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
7 Conclusisons

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