第三代行動通信網路分封數據服務之規劃設計

Abstract

UMTS (Universal Mobile Telecommunications System)為第三代行動通信網路標準之一，其網路架構係演進自第二代行動通信網路(GSM/GPRS)。除基本的語音服務外，UMTS可提供高速封包交換式(Packet Switched; PS)數據服務供用戶接取多樣化的行動寬頻多媒體服務。因此，如何將PS數據服務技術整合到行動網路便成為重要的研究課題。本論文針對第三代行動通信網路PS數據服務之規劃設計進行研究。我們首先研究UMTS行動管理機制並與GPRS之機制做比較，以做為後續研究之準則。同時也針對UMTS與另一個第三代行動通信網路標準cdma2000之行動管理和連線(Session)管理機制進行研究比較，然後提出一互運架構和程序使得PS數據服務能夠於UMTS和cdma2000二網路間平順地漫遊。我們也針對UMTS GGSN (Gateway GPRS Support Node)如何提供用戶IP連線提出設計範例並藉由實例來說明GGSN使用的各項技術。我們並以數學分析模型研究用戶與行動網路間之認證行為，提出一種可有效降低網路信令負載之動態機制。針對多媒體訊息服務(Multimedia Messaging Service; MMS)之群播(Multicast)機制，我們提出一可行架構和程序來提供MMS之群播服務，並以數學分析模型來分析其效能。最後我們以數學分析模型來探討平行HLR系統之可靠度效能，做為UMTS網路元件設計之參考。

Universal Mobile Telecommunications System (UMTS) is a third generation (3G) mobile network, which evolved from the second generation systems such as Global System for Mobile Communications (GSM) and General Packet Radio Service (GPRS).In addition to basic voice services, UMTS provides mobile users high speed Packet Switched (PS) data communications that support real-time multimedia services (e.g., streaming video) and voice over IP. Thus, how to integrate the PS data services into the mobile networks has become an important research issue. In this dissertation, we explore the design and implementation issues for the PS domain of 3G mobile telecommunication networks. We first investigate the mobility management mechanisms for UMTS PS domain, and compare the mechanisms with that provided by GPRS. Then we elaborate on the differences of the mobility management and the session management between UMTS and cdma2000, and propose an interworking solution that allows PS data services to roam between UMTS and cdma2000 networks. In UMTS, the Gateway GPRS Support Node (GGSN) provides the IP connection between the mobile network and external packet data networks. We elaborate on the design of IP connectivity for GGSN, and give examples to illustrate how these functions can be implemented in a commercial mobile network.We also propose efficient mechanisms for authentication vector management and for multimedia message multicasting in the UMTS PS domain. Finally, an analytic model is proposed to investigate the performance of the parallel Home Location Register (HLR) architecture, which provides guidelines for designing the parallel HLR system.