在二十一世紀資通訊科技（Information Communication Technology，ICT）議題中，對於決定一個國家競爭力之要素而言，主導知識經濟的電信產業與電信部門之發展及相關科技政策與管理是關鍵的重點。展望未來，電信、廣播及資訊三者之技術與服務匯流將日趨明顯，扮演整合通訊與傳播市場的監理角色，能有效排除跨業經營障礙，使得電信、廣播及資訊等三大領域之產業均能在公平的基礎上從事良性競爭與互動，從而加速相關產業的整合發展與應用，使得消費者、政府及業者皆能從技術精進及產業整合中獲取最大的實益。
在廣播和電信服務的匯流（Convergence）、固網和行動服務的整合應用，以及網際網路成為所有應用服務的傳遞平台，亦即所謂的「數位匯流」趨勢下，不論是全球化、市場與客戶導向，自傳統技術至互連性（Interconnectivity）與互通性（Interoperability）等技術之精進，或是傳統上各自獨立的產業包括電信、傳播與資訊整合成所謂的「資通訊產業」（Info-communication Industry），其語音、影像、數據、多媒體傳播均將因網際網路的發展統合彙整在單一共通的網路平台上。這個全球通訊電信的變遷，促使大部分國家之電信部門為因應此通訊環境之快速變化，大多已進行組織變革及技術的提升，或是處於此變革改造的發展之中。
在ICT發展潮流下，不論是「新世代網路」（Next Generation Network; NGN）、「多媒體子系統」（IP Multimedia Subsystem; IMS）或是「固定業務和移動業務融合」（Fixed-Mobile Convergence; FMC），均帶動一個數位匯流之新世紀。然而在此因技術所推動的變遷下，原有政策組織與法律已不敷時代之變化，衍生出創新應用的經營模式，同時其所產生的「數位落差」（Digital Divide）現象如富國與窮國、城市與鄉村之差距等，均需藉由調整新政策與法規來順應時代的變化。解決之方法為：開放寬頻資通訊市場競爭；允許私人企業之參與；以及建立監理法規。
目前以VoIP技術為基礎的網路電信業務，開始挑戰傳統電信服務市場；各家業者均積極開始規劃新世代的通訊技術與服務。新的網路技術與新的應用服務，勾勒出一幅新的應用藍圖，引領新一波的企業投資與競爭！本研究以新世代匯流網路之架構及應用服務VoIP為案例，提出Inter-Exchange Center of Converged Network Architecture (IEXCNA,匯流互連交換中心)的架構，應用teletraffic theory，證明在傳輸頻寬的利用上，能更有效率。以提供在邁向新世代匯流型網路的變革中，解決電信網通業者的互連障礙及降低建置成本，使民眾的利益及服務品質獲得應有的保障。

In 21st century, the development strategy and the management policy of Information Communication Technology (ICT) is a key issue to a nation’s competitiveness. Particularly, the development of telecommunication liberalization, governance in the telecommunications regime and the relevant science and technology policies of the telecommunication industry is the most important factor for creating a leading knowledge-based economy for Information Communication Technology related industries.
Looking forward to the future, the trends and developments of the convergence of telecommunication, broadcasting and internet services will drive the demand for the telecommunication and broadcasting industries to look for cost-efficient provisioning of converged multimedia services. The emerging technology of next generation network (NGN) infrastructure enables the convergence of multi-access networks to deliver the multimedia contents and application services seamlessly. Therefore, the consumers, government, and industry can obtain the benefits because of technology development and industrial cooperation.
In addition, the converged broadcasting and telecommunication services as well as Fixed-Mobile Converged applications over the internets results in the needs for the improvement in network interconnectivity and service interoperability. No matter it is telecommunication, broadcasting or information, to converge as common info-communication services, such as telephony, data and multimedia will eventually run over the all IP networks. Therefore, IP Multimedia Subsystem (IMS) becomes one of the promising technologies to drive it happen. However, existing policy and regulations must cope with the changes of this development. The liberalization of broadband and communication market allows the participation of the private companies to create new investment and revenue.
This research studies the possible evolution of an IP-based communication infrastructure from today's networks toward a converged next generation network and proposes an Inter-Exchange Center of Converged Network Architecture (IEXCNA), applying to VoIP service. The IEXCNA model shows more efficient in the transmission, interconnectivity and reducing implementation cost of network infrastructure. Thus the consumers are able to enjoy better quality of service and cheaper rate of use for multimedia services.

Table of Contents
論文提要 i
致謝辭 iv
Abstract v
I、INTRODUCTION 1
1.1、Research Motivation 2
1.2、Research Purpose 3
II、REVIEW OF LITERATURE 4
2.1、Wireless and Wireline Technology Development Trend 4
2.2、NGN Converged Network Architecture and IMS 16
2.3、Voice over Internet Protocol (VoIP) Service 25
2.4、Traffic Dimensioning Theory for Telephony Service 28
III、RESEARCH METHODOLOGY 31
3.1、Research Strategy and Expected Outcome 31
3.2、Thesis Structure 32
IV、IEXCNA MODEL FOR VOIP SERVICE 33
4.1、System Functionality of IEXCNA for VoIP Service 33
4.2、Call Flow of VoIP Service in IEXCNA Model 37
V、RESEARCH FINDINGS AND DISCUSSION 46
5.1、Traffic Load Calculation and Bandwidth Dimensioning 46
5.2、Overall IEXCNA Model for Commercial VoIP Service 54
VI、CONCLUSIONS 58
REFERENCES 63

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