網際網路原先僅提供盡力傳送（best effort）的服務，其將所有傳輸的資料均一視同仁。在盡力傳輸服務的環境下，是很難滿足具即時性質的多媒體應用之服務品質要求。整合性服務(Integrated Service)和差異性服務(Differentiated Service)強化了現行網際網路架構對服務品質的支援。然而，整合性服務下，我們也發現到不管是重新開發或是修改現有的程式碼，要設計支援RSVP的應用程式並不容易。另外，在差異性服務下,由封包加上標籤(DiffServ Code Point)來辨識服務等級，但一般應用程式和作業系統卻不支援將封包加上標籤功能，造成使用上的缺乏彈性以及邊界路由器(Edge router)負擔過大。在本論文中,我們將發展一種新的通透性機制讓網路軟體支援RSVP連線，或是提供服務端設定封包標籤欄位功能，使用者在IntServ 或DiffServ下容易使用QoS。並且利用這機制針對可變速率視迅軟體提供動態頻寬保留，讓使用者享受較佳的服務品質，同時達到有效率的使用網路頻寬。我們經由實驗加以驗證此機制對於可變速率視訊軟體的通透性，並且陳列出動態頻寬保留的服務效能與網路頻寬使用率的實際測試結果。

Based on the best-effort delivery strategy, all packets are treated equally in the Internet. In this situation, it is difficult to satisfy the required QoS for real-time multimedia services. Currently available solutions, classified into Integrated Service (IntServ) and Differentiated Service (DiffServ), spend much effort on enhancing the Internet architecture for QoS. However, it is difficult to design RSVP-aware applications in IntServ, no matter a completely new one or modified the original source codes with RSVP function. Besides, the may in DiffServ to identify the service class of each packet is based on marking Differentiated Service Code Point (DSCP). The lack of marking packet in end host and applications causes the overhead in edge router and flexibility for users. In this paper, we develop a mechanism, the Transparent QoS Mechanism (TQM) to transparently provide both services to applications. With the TQM, the user can freely select applications at run time to utilize the IntServ or DiffServ. Furthermore, these applications are not required to modify or rebuild for benefiting from the TQM. After testing the proposal in VBR video-streaming applications, we prove that TQM can make the applications not only efficiently utilize the network bandwidth but also effortlessly meet the requirements for QoS in a transparent way.

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