中文摘要：

当前流媒体系统的研究主要从数据调度层及覆盖网层内部各自展开，缺少对于层次间关系的建模描述及优化。为解决此问题，建立P2P流媒体层次间闭环控制模型，具体分析覆盖网层所提供信息的误差对数据调度层及系统整体性能的影响。并在此基础上提出基于数据调度反馈的增强型层次间交互模型，用以优化覆盖网维护。

英文摘要：

Current research on P2P streaming system mainly focus on the internal of data scheduling and overlay layer respectively. To solve the missing of modeling and optimization on inter - layer relationship, we set up a closed - loop control model for the inter - layer relationship and analyze how the performance of scheduling layer and the overall system influenced by the error provided by overlay. Then an enhanced interaction model based on feedback of scheduling layer is proposed to optimize overlay maintain.