隨著多媒體編解碼技術的進步與網際網路的普及，多媒體已成為主要的資訊傳遞媒介，以網路封包傳送媒體碼流收視之IPTV，已成為網路多媒體主要的發展趨勢。國際組織OIPF(Open IPTV Forum)也正致力於推動IPTV之標準化，可見此技術在未來極具潛力。本論文配合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、數位加解密與認證等多項關鍵技術，實際開發完整且具安全性之即時媒體中心系統，並建立整體IPTV內容與服務安全保護架構；本論文透過整合內容傳遞網路(Content Delivery Network, CDN)與點對點(Peer to Peer, P2P)傳輸之協同式架構，進行IPTV之服務傳輸，並針對即時媒體傳輸，提出「多參數調適群播樹」(Multi-Parametered Adaptive Tree, MPAT) P2P演算法，以節點頻寬、在線時間與相對延遲作為依據，動態調整群播樹節點的位置；MPAT演算法除了希望克服因節點加入順序不固定可能造成的「傳輸瓶頸」，也藉由減少節點斷線之頻率，提升群播樹傳輸的穩定度。目前P2P網路之相關研究，大多缺乏理論與實際系統之結合，本論文除了針對即時傳輸之P2P網路，在理論上提出差異與改進外；也期望藉由實際系統開發，驗證理論之可行性。實驗結果顯示，本論文提出之MPAT演算法確實可以減少傳輸之延遲並提升群播樹傳輸之穩定度。

With the advance of multimedia codec technologies and Internet prevalence, multimedia has become one of major information communication tools. Transmitting televisions through Internet packets, IPTV, becomes the mainstream of Internet multimedia. The Open IPTV Forum, OIPF, is aiming to propose the IPTV system standard, which proclaims the potential of IPTV-related technologies. In this thesis, a complete and secured IPTV system, which comprises media codec systems, streaming control and encryption/decryption control units, has been developed to meet the application requirement of Internet multimedia. The Content Delivery Network (CDN) and Peer to Peer (P2P) network are integrated to provide the P2P-IPTV service. To stream live videos, we proposed a Multi-Parametered Adaptive Tree (MPAT) algorithm, which takes peer bandwidth capacity, network connection duration, and delay parameters, to dynamically adjust the video multicast tree for better P2P-IPTV services. The algorithm is developed to solve the bottleneck of dynamic peer linking behavior that would lead to unstable P2P-IPTV quality of service. To improve the reliability of multicast tree, the MPAT is designed to reduce the frequency of peer disruption. Compared to previous researches, the practical P2P-IPTV system is carried out based on theoretical analysis to improve its quality of service. Our experiments show that the proposed P2P routing strategy can reduce the transmission delay, and improve the reliability of multicast tree.

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