基于P2P和CDN的流媒体直播系统的设计与实现

Design and Implement on a Live Media Streaming System Based on Peer-to-Peer and CDN

对现有流媒体播放系统的相关技术进行了分析比较,指出了各自的优点以及存在的问题。结合CDN与P2P两种技术的优点,改善传统内容分发网络拓扑结构,把P2P的扩展能力和CDN的可靠性、可管理性有效地结合起来,设计并实现一种效率高、可扩展性好、稳定性强、可管理的流媒体直播系统。并且对系统的节点管理、缓存管理、数据调度等关键技术进行了介绍,最后对该系统的特性进行了分析。仿真实验表明,在大规模网络环境中,该流媒体直播系统比单纯的P2P系统在性能上有明显的提高。

Current technologies adopted by live media streaming system were compared and analyzed, and many problems of these technologies were proposed. To solve the problems of exiting live media streaming systems, combined with the merits of CDN and P2P network architectures, this paper proposed and implemented a new live media streaming system which improves the network topology of traditional content distribution networks. And a solution for critical issues was given, such as the user peer management strategy, buffer management strategy and data schedule scheme, then the merits of this new live media streaming system were analyzed. Simulation studies show that, in large-scale networks environment,the proposed system has improved performances than the current exiting P2P live media streaming systems.