由於終端設備及網路的使用不斷地成長，使得調適多媒體資源去符合使用者需求以及符合使用者終端設備的環境需求變得越來越重要，那代表著提供一個無所不在的多媒體服務，讓使用者可以在任何時間、任何地點、透過任何行動或固定式的終端設備，去存取、觀賞他所需要的多媒體資源已經成為時勢所趨。在這篇論文當中，我們提出了一個以SIP為基礎的可適性串流系統（SIP-based Adaptive Streaming System，SASS），並整合MPEG-21和SIP來達成這個目標。SASS是利用SIP訊息（Message）承載MPEG-21數位媒體物件（Digital Items）的一個整合式數位媒體物件描述語言（Digital Item Description Language，DIDL）文件，來提供最符合使用者環境需求，且最佳品質的多媒體資源。在調適位元傳送率（Sending bitrate）上，我們提出了一個位元率調適機制（Rate Adaptation Mechanism），在異質網路環境中傳送MPEG-4串流影像，論文中所提及的靈敏及穩定濾波器（Stable Sensitive Filter，SSF）能根據網路中所觀察到的資訊去估測現在可用的頻寬，並動態去調適位元傳送率。在實作方面，我們在異質網路環境中建立了一個無所不在的隨選影片（Video-on-Demand，VoD）服務，並呈現出SSF在有線網路及無線網路環境中都是一合適的估測頻寬的方法。

As the growth of computer devices and broadband network, the multimedia content adaptation and delivery become more and more important for constructing a ubiquitous multimedia service. That is, a user is free to access multimedia service at anytime, anywhere, through any mobile or fixed devices. In this thesis, we proposed a SIP-based Adaptive Streaming System （SASS） that allows convergence between MPEG-21 and SIP to achieve this goal. SASS uses SIP messages to carry the MPEG-21 Digital Items described by a converged Digital Item Description Language（DIDL）that provides the suitable video qualities to users for various devices. For the real time adaptation of the sending bitrate, we proposed a rate adaptation mechanism for streaming MPEG-4 FGS videos over heterogeneous networks. The proposed Stable Sensitive Filter （SSF） is able to estimate currently available bandwidth based on the observed network information and dynamic adjust the sending bitrate according to the estimation bandwidth. We also implement a system by constructing a ubiquitous Video-on-Demand （VoD） service over heterogeneous network environment and the corresponding result shows that the proposed SSF is a feasible approach of bandwidth estimation over wired/wireless networks.

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