針對移動管理所做之行動節點對話控制

隨著無線傳輸技術的進步與普遍，今日的無線網路存取愈來愈方便。傳統電信網路使用電路交換技術支援語音通訊，至於2.5代及3代行動通信則利用Serving GPRS Support Node及Gateway GPRS Support Node支援封包資料交換，這些技術都需要保留專屬線路、頻寬和設備以提供服務，造成系統沒有效率。採用封包交換技術可使無線網路的使用更有效率且更節省成本，但也因沒有保留固定通道給行動節點，當行動節點從一個網路移動到另一個網路以致位址或路由改變時，無法再利用電路跳接完成轉接。SGSN和GGSN被設計用來支援移動和轉接，除此外的其他無線資料網路只能支援固定式的無線存取。為了達成支援行動和轉接的能力，我們參考TCP/IP協定的堆疊架構，在網際網路的TCP及應用層間加入行動節點對話控制層。行動節點對話控制層可以支援無線封包的轉接及連線的重新接續，達成無線封包轉接的支援並強化傳輸的效能。本文首先回顧現有電信業者如何達成行動通訊轉接及控制對話連線的技術，再檢視已有的IP層無線轉接方法，最後提出利用行動節點連結控制層達成行動節點轉接支援的架構並評述其效能。

關鍵字

行動節點對話控制；國際行動節點識別；對應節點；行動節點；外部代理；家代理；轉接；邏輯網路插槽

並列摘要

According to the advancement and popularize of the wireless transmission technology, accessing wireless networks has become convenient nowadays. Traditionally telecommunications use circuit switching to support voice. However, 2.5G and 3G technologies establish packet data communications via Serving GPRS Support Node and Gateway GPRS Support Node. All these technologies have to reserve dedicate lines, bandwidth and equipments to provide services. It causes the inefficiency of the system. Packet switching can provide more efficient and less expensive wireless networks. However, it does not reverse dedicated channels for specific mobile nodes. It means the connection would fail because of the change of the IP address and routing rules while the mobile node moves from one network to another. SGSN and GGSN are designed to support mobility and handoff. As for the other wireless data networks, only fixed access is supported. To support mobility and handoff, we are referred to the layered TCP/IP protocol stack and create a new Mobile Node Session Control (MNSC) layer that locates between TCP and Application layers. MNSC can be used to support handoff, connection reestablishment and enhance transmission performance. In the following chapters, we’ll first review the current telecom handoff and session control technologies. And then we will introduce articles discussing IP layer handoff. Finally, we’ll propose a new MNSC architecture and evaluate its performance.

並列關鍵字

Mobile Node Session Control ； International Mobile Node Identifier ； Correspondent Node ； Mobile Node ； Foreign Agent ； Home Agent ； Handoff ； Socket

參考文獻

[1] Ian F. Akyildiz, Jiang Xie, and Shantidev Mohanty, “A survey of mobility management in next-generation ALL-IP-BASED wireless systems,” IEEE Wireless Communication, Aug. 2004, pp. 16-28.

[4] Information Sciences Institute, University of Southern California, “Internet Protocol,” Sep. 1981, RFC 791.

[6] Douglas E. Comer, “Internetworking with TCP/IP: Principles, Protocols, and Architecture,” Prentice Hall International, Inc., pp. 253-267.

[7] Information Sciences Institute, University of Southern California, “Transmission Control Protocol,” Sep 1981, RFC 793.

[8] A. T. Campbell et al., “Comparison of IP Micromobility Protocols,” IEEE Wireless Communications, Feb. 2002, pp. 72–82.

國際替代計量

針對移動管理所做之行動節點對話控制

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