基于云服务传递网络的弹性P2P VoD覆盖网构造方法

Elastic Overlay Construction Method for P2P VoD Based on Cloud Service Delivery Network

部署于云服务传递网络(Cloud Service Delivery Network,CSDN)基础设施的P2P VoD系统,在每个CSDN节点内将同一节目的所有用户构建成P2P覆盖网,但CSDN单节点内大量节目的并发用户稀少.因此,如何在兼顾流量本地化的前提下,解决CSDN架构下P2P VoD覆盖网构造中Peer资源稀疏问题是当前面临的一个挑战.为此,提出一种P2P覆盖网的弹性构造方法ECM(Elastic Construction Method).ECM依据资源索引来弹性扩展P2P覆盖网的构造范围,有效解决Peer资源稀疏问题;同时根据CSDN节点间距离来选择扩展路径,实现P2P流量本地化.最后模拟实验结果表明,ECM能有效均衡服务器负载和跨ISP流量.

The P2P VoD which is deployed on the infrastructure of Cloud Service Delivery Network （ CSDN）, all users of the same program in each CSDN node forms a P2P overlay network. However, the concurrent users of a large number of programs are scarce within each, CSDN node. So it＇s a great challenge to solve the peer resource scarce problem in the construction of P2P VoD overlay on the condition of traffic localization. For the challenge, this paper presents an Elastic Construction Method （ ECM） for P2P overlay. In order to solve the peer resource scarce problem, ECM elastic scales the construction scope of P2P-overlay on the bases of the resource index. Meanwhile, ECM chose the scale path based on the distances among CSDN nodes to realize P2P traffic localized. Finally, through the simulation, we validate the effectiveness of ECM in balancing CSDN server load and cross-ISP traffic.