在無線都會寬頻網路系統中，使用者通常都不會固定的停留在某一地點，而是自由的移動，因此基地台需提供移動式的連接服務。針對這項特性，本論文提出了一個分散式的點對點多媒體傳輸技術，可以在無線都會寬頻網路的環境中，提供大量使用者欣賞多媒體節目。這項技術可以自動的排程一些移動性較低的使用者(稱為“種子”)來幫助系統傳輸，當有使用者因為故障或是換手造成中斷時，這項技術可以讓其他的使用者盡量維持在最好的觀賞品質，並且能盡快修復損失的效能。本論文使用了ns-2來驗證所提出的技術，實驗結果顯示包括影像品質以及系統穩定度都有很好的表現。

In a WiMAX system, users typically do not stay in fixed locations. They can move freely so the base stations providing connection service are changed sometimes. An
efficient and fault-tolerant scheme for supporting services is thus necessary. This thesis describes distributed P2P-based IPTV mechanism for scalable video streaming service in WiMAX systems. The mechanism can automatically schedule some nodes (seeds) that help for transmission based on the current topology. The mechanism is also able to
reconstruct connections if handoff or node failure occurs. The IPTV mechanism has been evaluated using ns-2 simulator. The results show that both quality of video streaming
and system reliability are improved.

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