一种用于P2P流媒体系统的动态树-网状网混合覆盖网络  

Hybrid Dynamic Tree/Mesh Overlay for P2P Streaming

作　　者：刘芳林[1] 洪佩琳[1] 

机构地区：[1]中国科学技术大学电子工程与信息科学系信息网络实验室,安徽合肥230027

出　　处：《小型微型计算机系统》2009年第4期657-660,共4页Journal of Chinese Computer Systems

基　　金：国家下一代互联网(CNGI)示范工程项目"基于IPv6的P2P弹性重叠网络智能节点的研制"(CNGI-04-12-1D)资助

摘　　要：应用层覆盖网络是因特网P2P流媒体系统的主要组成和有效解决方案,它的构建直接影响到系统的视频传输质量.目前的覆盖网络主要有树形(tree)和网状网结构(mesh),但是这两种结构的覆盖网络都有其自身固有的缺点:树形结构对节点动态性的容忍能力差,丢包累积,网状网结构数据包传输延时较大.本文结合两种覆盖网络的优点,利用网状网动态分配数据包的思想,动态分配描述流,提出一种用于P2P流媒体系统的动态树-网状网混合覆盖网络.仿真和分析表明,本覆盖网络有效地克服了树形结构丢包累积和网状网结构数据包传输延时大的缺点,能够自适应节点动态性和网络带宽的波动,降低丢包率,减小传输延时.Application layer overlay have emerged as the most promising solution for P2P Streaming on the Internet. The overlay is a very critical component in this system. It influences the image quality directly. There are mainly two kinds of overlay：tree and mesh. However, there are internal weaknesses in both these overlays. In the tree overlay, data loss rate is very high. In the mesh overlay, transmission delay is very large. In this paper, we propose a hybrid dynamic tree/mesh overlay which combines merits of tree and mesh overlay. In this hybrid overlay, we dynamically allocate descriptions to parent nodes, changing the trees into dynamic trees which can adapt network bandwidth fluctuation. Simulations show that our hybrid overlay can overcome the weaknesses of tree overlay and mesh overlay, adapt node dynamics and network bandwidth fluctuation, decrease data loss rate and diminish transmission delay.

关 键 词：应用层组播 P2P流媒体 覆盖网络 动态树 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]