基于在线评估的无线Mesh网流媒体缓存

Online-Estimation Based Streaming Media Replication Over Wireless Mesh Network

针对无线Mesh网的特点,本文研究了媒体片段副本密度的理想最佳分布与流媒体片段流行度空间分布、节点能力以及节点稳定性之间的关系,提出了基于副本稳定性补偿的缓存优化算法.相应的,为了及时准确地了解各个地点的节点行为特性,本文提出了基于年龄分布分析的可靠性评估算法.进而本文提出了一种轻量级的全分布式的流媒体缓存策略实施方案.这些算法和缓存策略占用资源小,既不需要增加额外的复杂设施,也不需要过多的额外开销,既保持了无线Mesh的扩展性和灵活性,又兼顾了节点计算能力弱、资源有限等约束.

In view of the characteristics of Wireless Mesh Network（WMN）,this paper investigates the relationship between the ideal optimal density of replicas over the space and the popularity spatial distribution of the media segments together with the capacity and reliability of the nodes,and then proposes a reliability repairing based replication optimization algorithm.Accordingly,to timely and accurately understand the characteristics of the nodes at various locations,this paper proposes a reliability estimation algorithm base on analyzing the age distribution of media segments and nodes.Further on,an implementation of full-distributed lightweight replication strategy is presented.These estimation algorithms and caching strategies only employ the handy information without adding complex infrastructure or suffering too much overhead,not only maintain the WMN scalability and flexibility,but also take into account the computing power and resource constraints.