基于节点异构性优化的P2P流媒体传输技术

提出一种基于节点异构性优化的P2P流媒体传输技术。与已有的P2P流媒体传输技术相比,新技术考虑了P2P环境下各节点在服务能力(包括上、下行带宽,在线时长等)上的异构性。为满足系统可扩展性的要求,方便系统管理,算法采用层次簇的思想,将节点按一定规则组成多层次簇结构,簇首节点负责管理本簇成员节点,有效减轻高层次节点的管理负担。同时采用GNP算法(GlobalNetworkPositioning,全局网络定位),通过计算各节点的GNP网络坐标找出邻近节点。将邻近节点划为同一个簇进行管理,让服务能力强的节点位于多播树的上层,并根据网络状况动态自调整系统结构,以实现系统负载平衡,提高系统服务质量。

Optimized Heterogeneity-Aware Transmission Method for Peer-to-Peer Media Streaming

This paper presents a new transmission method for P2P streaming.Compared with existed methods,the new method considered the heterogeneity of service capabilities among peers(upload bandwidth,download bandwidth,service time and etc.).The authors cluster peers into a hierarchy for easy management.In each cluster,the cluster-head manages other peers.So as to find peers nearby,the authors use GNP method to compute a network position for each peer.When building multicast tree,higher capable peers are positioned at higher layers,and nearby peers are clustered together.Under network dynamics,the system organization can be periodically reconfigured to dynamically balance the service load among the peers.