Research On Some Key Technologies Of P2P Streaming Network

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.