无结构P2P网络应用层组播的多播树研究

IP组播方案由于其自身的设计以及部署代价等问题未能获得大范围的推广，作为替代IP组播的一种方案，应用层组播已经成为一个重要的研究课题。同时基于覆盖网络的P2P网络的特性使得应用层组播方案得到实际的应用。本文以Gnutella例分析了无结构P2P网络的多播树生成过程，针对其多播树生成的随机性，提出了一种优化的多播树生成方法。性能分析显示，本文提出的多播树生成方法，使多播树的深度保持在可预测的范围，有效地优化了无结构P2P网络的多播树。

Research on the Multicast Tree of Application Layer Multicast in Unstructured Peer-to-Peer Network

IP Multicast scheme because of its own design and deployment costs of large-scale issues resuits in failure to promote. As an alternative IP Multicast scheme, application layer multicast has become an important research topic. At the same time the application layer multicast being applied profits from the characteristics of p2p network based on the overlay network. This paper sets Gnutella as an example to analyze the generating process of multicast tree in the unstructured P2P networks . For random characteristic generated by multicast tree, we propose a optimization of the multicast tree generating method. PerformanceAnalysis shows that the proposed method can make the depth of the multicast tree in a predictable range. Thus it effectively optimize the multicast tree of the unstructured F2F networks.