提出了一种邻居选择算法，包括节点选择和块选择2个子算法。前者保证请求节点能够以较低的被拒绝概率发现提供视频数据的邻居节点；后者为节点以何种方式下载数据块提供依据，保证系统中视频数据块的高可用性。实验结果表明，提出的算法能进一步降低服务器带宽开销和节点请求拒绝率，并提升节点的下载速率。%A neighbor selection algorithm was proposed which was composed of sub-algorithms of peer selection and chunk selection. The peer selection algorithm assured that the peers could find the neighbors providing the video data at a high probability. The chunk selection algorithm helped peers choose the methods of downloading data, from which the data chunks could be used at a high availability. The experiment demonstrates that the algorithm can further decrease the server bandwidth costs and the refusal rate of peers’ requisition, and improve the download rate of peers.
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