内容中心网络中基于差异化缓存通告的混合路由机制

针对内容中心网络(CCN)节点暂态缓存的高效利用问题，将数据场的思想引入到CCN转发决策中，该文提出一种基于差异化缓存通告的混合路由机制。缓存通告时，依据内容活跃等级和缓存驻留概率，执行差异化的内容通告和势能辐射；路由查找时，针对持久稳定的内容源和动态可变的临时缓存副本，分别构建全局导向和局域吸引势能辐射场，实现兴趣包请求的全局路由和局部就近应答。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，以少量额外的开销提升了CCN网络整体的内容分发性能。

A Hybrid Routing Scheme Based on Differentiated Cache Advertisement in Content Centric Networking

How to efficiently utilize the temporary cached replicas poses challenges to the retrieval process of Content Centric Networking (CCN). Inspired by the idea of data fields, a hybrid routing scheme based on differentiated cache advertisement is proposed. In the scheme, depending on the content popularity and resident probability, the differentiated advertisement strategy is performed to choose the advertised content and calculate the attracting potential. When a retrieve is requested, in order to realize global routing and local response to the content request, the globally oriented potential field and locally attracting potential field are constructed for the stable original content source and volatile cached copies, respectively. The simulation results show that the scheme can decrease the request latency, increase the cache hit ratio, while improving the overall performance of content delivery with a small amount of additional overhead.