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  • 學位論文

一個改良以SIP為基礎之行動通訊換手策略

An Improved SIP-based Handoff Mechanism in Mobile Communication

指導教授 : 王英宏

摘要


由於用戶對於多媒體及行動性做需求的與日俱增,發展出第2.5代以及第三代的行動通訊系統;第三代行動通訊系統對於資料的傳輸能力已經達到2Mpbs,這樣的傳輸速率讓使用者可以在行動中使用視訊會議等高傳輸量的服務。近年來筆記型電腦、PDA、智慧型手機…等可攜式電腦設備日漸普及,帶動了行動通訊系統與無線區域網路的整合,逐漸朝向同時具有移動性與高傳輸速率的網路型態發展,因此應用在行動網路上的協定也因應而生;目前有兩個方案是在解決行動管理的問題,一個是屬於網路層上的行動IP(Mobile IP)而另一個是屬於應用層上的會議起始協定(Session Initiation Protocol)。 由於傳輸速率的增加,讓使用者可在行動中使用大傳輸量的及時性服務,但因為會議起始協定本身的特性,會讓換手完成的時間拉長,造成通訊中部分資料的遺失。本論文針對SIP的特性,提出了一個改良以原有SIP為基礎的換手策略,目的在減少換手過程中資料的遺失,提供給使用者一個更好的通訊品質。

並列摘要


As a result of a great deal of demands in multimedia and mobility communication services from users, 2.5G and 3G mobile communication system services are available nowadays. This advanced technology provides users being able to having high transmission rate service, such as video conference. With the popularity of portable personal electronics, e.g. notebook, PDA and smart phone, the integration of mobile communication system and WLAN has been proceeding actively and aims for building the network with mobility and high transmission rate . Therefore, there are now two major solutions available for mobility management, one is Mobile IP witch works on network layer while another is Session Initiation Protocol that works on application layer. With the increasing of transfer rate, users already have mass transfer and real-time services today, however, the characteristics of SIP would enlarge the time of handoff that usually cause apparent data losing problem during the communication. This paper presents a new handoff strategy based on SIP that reducing the losing of data during handoff, and hoping to provide a better quality of the communication services for users.

參考文獻


[4]劉煌生, ”以MPLS為基礎的3G/WLAN整合網路之換手策略,”淡江大學資訊工程學系 碩士論文,2005年.
[8]IETF, ”Mobility Support in IPv6,” http://www.ietf.org/rfc/rfc3775.txt.
[9]IETF, ”Session Initiation Protocol,” http://www.ietf.org/rfc/rfc3261.txt.
[11]IETF ,”Session Initiation Protocol (SIP) Basic Call Flow Examples,” http://www.ietf.org/rfc/rfc3665.txt.
[14]Yi-Bing Lin, Ai-Chun Pang, Yieh-Ran Haung, Chlamtac, I.” An all-IP approach for UMTS third-generation mobile networks,” IEEE Network. 2002 Volume: 16 , Issue: 5 pp. 8 – 19.

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