支持高视频播放率的层次化P2P流媒体系统

A Hierarchical P2P Streaming System Supporting High Video Playback Rates

目前的P2P流媒体系统具有自组织、容错性和匿名性等优点,但是在健壮性和对高视频播放率的有效支持方面还存在一些问题。本文提出了一种层次化P2P流媒体系统(HPSS)来支持高视频播放率,节点根据带宽和延迟分组聚类,在系统中形成多级层次结构,从视频源服务器来取得视频数据。通过积极地平衡聚类中的上传能力,既能够有效地解决P2P系统中支持高视频播放率的问题,提供接近一个P2P系统能够达到的最大流媒体速率,同时保证系统具有良好的健壮性,在聚类的头节点失效的情况下,不降低整个系统的流媒体速率。最后通过仿真实验证明了HPSS的上述优点。

The current P2P streami.ng systems has the advantages of self-organization, tault tolerance, anonymity ann so on. But it is still challenging to support robustness and high video playback rates. In this paper, we propose a hierarchical P2P Streaming System （HPSS） to support high video playback. With HPSS, the peers are hierarchically grouped into clusters according to bandwidth and delay, a muhi-layer hierarchy is formed among clusters to retrieve video data from the source server. By actively balancing the upload capacity among clusters, HPSS can efficiently solve the problem of how to support high video playback rate, approaching the maximum achievable streaming rate of a P2P streaming system. At the same time it can guarantee the system is of good robustness, while the cluster head fails, it does not decrease the streaming rate of the streaming system. Finally the result of simulation demonstrates these advantages of HPSS.