【作者】 韩鹏；

【导师】 张志强；

【作者基本信息】 哈尔滨工程大学 ， 计算机软件与理论， 2009， 硕士

【摘要】 近些年来,随着网络环境的不断改善,流媒体应用得到了飞速发展。从基于代理服务器的流媒体组播方案到现在比较流行的基于P2P网络的流媒体组播方案,其发展速度十分迅猛。关于流媒体的许多关键技术也得到了长足的发展。如流媒体的编码技术,数据缓存技术和数据分发技术。其中,基于P2P网络的流媒体数据分发策略更是当前研究的热点。根据数据分发的拓扑结构可以将其划分为以树或多树结构为主和以网状结构为主的两类。但是,树结构是高度易损的,其适用于稳定性高且规模小的环境。网状结构虽然比较稳定,但其控制开销巨大,对网络造成的负载大。本文将设计一种新的流媒体数据分发策略——树网结合的流媒体数据分发策略(TDS)。该策略通过域内根节点(Sub_Root)有效的将树结构与网结构组织在一起,充分发挥两种结构各自的特点。TDS可以根据网络情况的变化,动态的调整数据传输结构。TDS充分利用网络资源,分散了源节点控制开销,有效的降低了系统控制开销,优化了数据传输路径,提高了服务质量。另外,本文提出的新策略在OPNET仿真工具上进行了模拟实验。本文将详细的介绍如何在OPNET仿真工具上对该策略进行模拟实验建模,如何构建PEERCAST,DONET和TDS系统的进程模型。最后,通过实验结果验证了TDS系统的有效性。更多还原

【Abstract】 In recent years, along with the network environment progressive improvement, the live streaming application has obtained rapid development. From the traditional multicast policy based on proxy server to the present quite popular policy based on P2P network its development speed is extremely swift. Meanwhile many key technologies of live streaming also have made considerable progress, such as coding technology, buffering technology and the data distribution technology. Among them. the data distribution policy based on the P2P network is the current hot spot. Based on the topology of distribution it can be divided into two main types, the tree or multi-tree structure and the mesh structure. But the tree structure is highly vulnerable. It is suitable for the environment of high stability and small scale. Although mesh structure is quite stable, its control costs are huge and it can make huge burden on the network.This dissertation presents the design of a novel P2P live streaming policy, tree-mesh based P2P Streaming Data Distribution Scheme ( TDS ) . This strategy organizes both the tree structure and the mesh together through Sub_Root, and calls their respective advantages into full pay. TDS can adjust data transmission structure dynamically according to the network change. It can: make the best of network resources, disperse the source node control costs, reduce the systems control costs, optimize the data transmission structure and improve the quality of service.Moreover, the simulation experiment of this new strategy has been carrying out on the OPNET simulation tool. This dissertation will introduce how to create the environment of simulation and how to construct the process model of PEERCAST. DONET and the TDS system. Finally, it can confirm the TDS system validity through the experimental result.更多还原