隨著多媒體信號處理與網路通信技術的進步，加上新科技暨新服務媒合資通訊、視訊網路、行動語音及影音數據等各種多媒體服務，如何有效整合媒體處理器以及網路資源以提供語音、數據及多媒體通訊服務，變得相當重要。本研究基於多媒體網路發展趨勢與實際需求，整合多媒體編解碼、串流傳輸、數位加解密、頻寬估測及網路位址轉譯(Network Address Translation, NAT)穿越機制等多項關鍵技術，開發具數位權利管理(Digital Rights Management, DRM)之即時媒體中心系統，以建置具安全保護管理之網路電視(Internet Protocol Television, IPTV)系統。本系統整合CDN與 P2P傳輸之協同式架構，進行即時媒體串流服務，並提出實作「多參數調適群播樹」(Multi-Parametered Adaptive Tree, MPAT)演算法，克服因節點加入順序不固定所造成「傳輸瓶頸」。另外，記錄收視服務期間，以節點頻寬、在線時間、中央處理單元(CPU)使用率與節點相對延遲等多參數為依據，動態調整群播樹節點位置，以減少節點斷線頻率以及提升群播樹傳輸的穩定度；實作P2P 亦整合NAT傳輸應用程序(Session Traversal Utilities for NAT, STUN)協定，讓位於NAT後之端點用戶具收視媒體碼流功能之外，亦扮演媒體碼流之傳送者，以達提升整體網路之傳輸效率。實作結果顯示本論文所提出MPAT演算法確實比其他方法較能夠減少群播樹之階層數與傳輸延遲並提升整體穩定度。於系統實作增加NAT穿越功能後，便能使位於NAT後之用戶為整體傳輸網路貢獻頻寬，以提升整體網路使用效率，為此架構系統增加異質網路之使用性。

With the advance of multimedia codec technologies and Internet prevalence, multimedia becomes one of major information communication tools. Transmitting Tele-Vision signals through Internet Packets, IPTV, becomes the mainstream of Internet multimedia. In this thesis, a complete and secured IPTV system, which comprises media codecs, streaming, encryption/decryption, bandwidth estimation and NAT traversal units, has been developed to meet the application requirement of Internet multimedia. The Content Delivery Network (CDN) and Peer-to-Peer (P2P) networks are integrated to provide the P2P-IPTV service. For streaming live videos, we proposed a Multi-Parametered Adaptive Tree (MPAT) algorithm to solve the bottleneck of dynamic peer linking behavior that would lead to unstable P2P-IPTV quality of service (QoS). To configure the IPTV, we take peer bandwidth capacity, peer online time, CPU utilization and transmission delay, to dynamically adjust the video multicast tree for low-delay P2P-IPTV services, and reduce peer disruption frequency for improving the reliability of the multicast tree. In addition, for transparent P2P-IPTV transmission services, the Session Traversal Utilities for NAT (STUN) protocol is integrated, in which the NAT traversal scheme is implemented to ensure that peers behind the NAT can also streaming out for other peers. Our experiments show that the proposed P2P routing strategy can reduce the transmission delay, and improve the reliability of multicast tree. By integrating the NAT traversal scheme in our system, it achieves the target of transparent P2P-IPTV services that can provide video streaming services over heterogeneous networks.

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