在行動多媒體網路下的服務導向系統

A Service-Oriented System in Mobile Multimedia Networks

鄭廷軒(Ting-Hsuan Cheng)

指導教授 ： 黃毅然

元智大學/資訊學院/資訊工程學系/碩士(2009年)

摘要

隨著無線網路、行動通訊、及網際網路的快速發展，低廉、快速的異質無線網路(Heterogeneous Wireless Network)服務環境，已然成形。在異質無線網路服務環境中，行動用戶可以透過不同的網路存取(network access)方式，取得低廉、快速的行動多媒體服務(Mobile Multimedia Service)。為了有效的整合異質無線網路服務環境中，不同型態的網路平台與服務單元，行動多媒體服務的建構，大多採用服務導向架構(Service-Oriented Architecture)的概念。值得注意的是，異質無線網路中的行動多媒體服務，會因為行動用戶的移動，而導致資料傳輸速率的改變，甚至服務中斷。如果，以重傳的方法，來解決因行動用戶移動所造成的服務中斷問題，不僅增加行動用戶取得服務的時間，而且浪費有限的無線網路資源。再者，對電力有限的行動裝置而言，也會造成相當大的電力損耗。而這樣的情況，會因為大量的多媒體資料內容，而更加嚴重。有鑑於此，我們採用服務導向架構的概念，設計並發展行動多媒體服務導向系統(Mobile Multimedia Service-Oriented System)，以縮短行動用戶於服務中斷後再取得服務的時間、減少無線網路資源的浪費、降低行動裝置的電力損耗。行動多媒體服務導向系統整合二個重要的功能：位置更新(Location Update)與連續服務(Continuous Service)。位置更新會依據行動用戶目前所在的位置，提供可用的網路服務資源。連續服務會依據服務中斷後的記錄，提供行動用戶連續傳輸服務。

關鍵字

異質無線網路 ； 行動多媒體服務 ； 服務導向架構 ； 位置更新 ； 連續服務

並列摘要

With the swift development of wireless networks, mobile telecommunications, and the internet, it is now possible to establish a low-cost and fast heterogeneous wireless network service. Under the heterogeneous wireless network service environment, mobile users are able to obtain low-cost and fast mobile multimedia service via various networks. In order to effectively integrate different types of network platforms and service units in the heterogeneous wireless network, most mobile multimedia services employ the Service-Oriented Architecture. It is worth noting that the data transfer rate of mobile multimedia service in the heterogeneous wireless network suffers from the movement of the mobile users. This can also cause service disconnection. Retransmission is one solution to the service disconnection problem caused by user movement. However, retransmission not only increases user access time, but also wastes the limited resources of the wireless network. In addition, it also requires significant power consumption, an issue for power-constrained devices. This problem can be severely worsened due to the large amount of multimedia information. Therefore, we design and develop the Mobile Multimedia Service-Oriented System based on the concept of the Service-Oriented Architecture. The mobile multimedia service-oriented system is expected to shorten the user reconnection time after service disconnection, reduce waste of wireless network resources, and decrease the power consumption of mobile devices. The two major functions of the system are: Location Update and Continuous Service. Location Update provides available network service resources based on the user’s current location. Continuous Service offers the user continuous transmission according to the service disconnection records.
Keywords：Heterogeneous Wireless Network, Mobile Multimedia Service, Service-Oriented Architecture, Location Update, Continuous Service.

並列關鍵字

Heterogeneous Wireless Network ； Mobile Multimedia Service ； Service-Oriented Architecture ； Location Update ； Continuous Service

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