中文摘要：

随着移动互联网和三网融合的兴起，网络带宽及终端异构性造成所选节点视频和请求节点的终端能力不匹配。为此，提出一种基于可扩展视频编码（SVC）分层匹配度的节点选择算法。在异构网络背景下，综合考虑节点带宽和链路往返时延，将 SVC分层层数和网络接入类型相结合。实验结果表明，与随机选择算法相比，该算法使得所选节点的SVC视频分层数与请求节点终端处理能力有较高的匹配度（固网、无线、3G接入网络类型所对应的匹配度分别为77.8，72.2，88.9），并且具有较高的终端平均服务能力（PC为110、笔记本为78.3、手机为38.3）。

英文摘要：

The rise of the mobile Internet and tri-networks integration brings a huge challenge to select resource peer for the requesting peer services in the Peer to Peer（P2P） streaming system. The video of the selected peer does not match terminal capabilities of the requesting peer because of network bandwidth and terminal heterogeneity. To solve this problem, a peer selection algorithm based on Scalable Video Coding（SVC） layering matching degree is proposed. Under the background of heterogeneous network, this algorithm combines the SVC layering layers and network access types, with a comprehensive consideration of peer bandwidth and link round-trip delay. Experimental results show that compared with the random selection algorithm, this algorithm contributes to a higher degree of matching SVC video layer of the selected peer with the terminal handling capacity of the requesting peer（the corresponding matching degrees of fixed network, wireless, 3G access network are 77.8, 72.2, and 88.9） and a higher terminal average service（PC is 110, notebook is 78.3, and mobile is 38.3）.