【摘要】 现有的点对点(P2P)流媒体系统不能很好地兼顾网络拓扑聚集性和流服务质量,存在延迟过长和覆盖网压力过大的问题。为此,比较典型节点选择算法在流服务质量、网络利用率、网络拓扑聚集性等方面的特征,采用拓扑聚集和带宽优先相结合的方法,提出一种两段式的节点选择算法。在PeerSim软件上的仿真结果表明,该算法相比于其他算法,覆盖网压力和流服务质量等性能较好。更多还原

【Abstract】 This paper analyzes and compares the feature of three typical node selection mechanism of Peer to Peer(P2P) streaming media system on the media stream quality of service,network utilizing rate,network topology aggregation,etc.Aimed to resolve the problems of higher overlay-network pressure and longer service delay in current P2P streaming system,by combined topology aggregation with bandwidth priority,a two-stage algorithm of node selection is proposed.The simulation with PeerSim software shows that the performance about overlay-network pressure and media stream QoS of two-stage algorithm,which is compared to other three kinds of node selection algorithm,is significantly improved.更多还原