基于FGS的P2P流媒体网络编码及调度

Network Coding and Scheduling of P2P Streaming Media Based on Fine Granularity Scalability

为满足异质网络环境下用户对服务质量的不同需求,利用网络编码在P2P网络流媒体中的性能优势,提出基于FGS的P2P流媒体网络编码及调度方法。通过网络编码分级和节点分级管理,使各个异质节点协作工作,由此实现非结构化P2P网络中的分布式数据调度策略。实验结果表明,该方法可以使系统中各节点的播放连续度维持在1.0左右,尤其是在节点接入带宽、起始播放时延、提供的缓冲区较小的情况下,性能明显优于传统方法。

In order to satisfy diverse quality of service in the heterogeneous P2P streaming systems, by making use of the advantages of network coding, a P2P streaming network coding and data scheduling method based on Fine Granularity Scalability（FGS） is proposed. By network coding grading and node rank management, it makes the heterogeneous nodes operate cooperatively with each other, and achieves the distributed data schedule strategy in unstructured P2P system. Simulation results demonstrate that the proposed method is capable of maintaining playing continuity degree close to 1.0 and has noticeable advantages over conventional scheduling method, especially under particular conditions such as low access bandwidth, small buffer and playback time delay and so on.