CCN中基于业务类型的多样化内容分发机制

针对内容中心网络(Content Centric Networking,CCN)如何提供差异化的业务需求服务的问题,采用区分服务的思想,从内容传输和缓存决策的角度出发,提出了一种基于业务类型的多样化内容分发机制.该机制依据不同的业务请求特征,分别设计了持久推送、并行预测和逐包请求的数据分发模式,对应提出了透明转发、边缘概率缓存和渐进式推进的沿途存储策略,实现了内容传递对于业务类型的感知和匹配.仿真结果表明,该机制减小了内容请求时延,提高了缓存命中率,以少量额外的控制开销提升了CCN网络整体的内容分发性能.

A Diverse Content Delivery Scheme Based on Traffic Types in Content Centric Networking

How to provide differentiated services for diverse types of traffic poses challenges to the retrieval process of Content Centric Networking (CCN).Inspired from the idea of differentiated service,a diverse content delivery scheme based on traffic types is proposed.When requesting contents,three delivery models,namely,persistent push,parallel predic-tion and one-one request,are proposed according to the characteristics of the requested traffic.When making the caching de-cision,three on-path caching policies,including transparent forwarding,probabilistic edge caching and gradual push are im-plemented respectively to match the delivery models.The simulation results show that the scheme can decrease the request latency,achieve higher cache hit ratio,while improving the overall performance of content delivery with a small amount of additional control overhead.