隨著高速、寬頻網路科技的演進，點對點即時串流服務逐漸成為一個普遍的趨勢，然而初始化延遲對多媒體點對點即時串流服務來說，仍就是一個很重要的議題。過長的初始化延遲會造成使用者在切換即時串流頻道時感到不舒適，為了縮短初始化延遲以提供更好的即時串流服務，我們提出了使用SIP為基礎之點對點群播機制達成多媒體即時串流服務。藉由利用SIP通訊協定，我們提出的機制不只縮短了即時串流播放中的初始化延遲，也減低了佈設即時串流服務基礎建設的成本。除此之外，我們的機制以互相競爭的方式建構出一顆平衡的群播樹而且避免了後續管理群播樹以使之穩定的負擔。效能評估證明了我們提出的機制成功地縮短了初始化延遲也建構出一顆平衡的群播樹。

With the proliferation of the high speed, broadband network technologies, the peer-to-peer live multimedia streaming becomes more and more popular. An important issue of the peer-to-peer live multimedia streaming is initial delay. The long initial delay will cause the user feels unsatisfied during changes the live streaming channel. In order to minimize the initial delay for proving better live streaming service, we proposed a SIP-based P2P multicast scheme for live multimedia streaming. By utilizing the SIP protocol, our proposed scheme not only minimizes the initial delay of playing time but also reduces the infrastructure deployment cost. In addition, we proposed a passive mechanism to construct a balanced multicast tree with zero stabilization overhead. The performance evaluation shows that our proposed scheme minimizes the initial delay and constructs a balanced multicast tree for live multimedia streaming successfully.

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