基于CCN节点内容流行规律的缓存路由策略

A Caching and Routing Strategy based on Dynamic Caching Notification and Regularity of Regional Content Popularity in Content Centric Networking

针对内容中心网络(CCN)中缓存路由策略的缓存可用性差、路径外缓存难以有效利用的问题,提出了一种动态缓存通告及节点内容流行规律的缓存路由策略.依据不同节点内容流行度进行差异化动态缓存通告,利用缓存通告信息及节点内容流行规律依概率进行缓存决策,增加高流行度内容的缓存概率及临近缓存的差异性;基于缓存通告信息建立局部吸引势场,并结合内容源建立全网吸引势场,实现内容请求的就近响应.仿真结果表明,在保证存储开销和传输开销的前提下,本策略可有效降低平均请求时延,提高缓存命中率.

Aiming at the problem of poor cache usability and difficulty of using off path cache in the existing caching and routing strategies in Content Centric Networking(CCN),a Caching and Routing Strategy based on dynamic caching notification and regularity of regional content popularity is proposed.Dynamic differential cache notification is carried out for the nodes with different node content popularity,cache decision is carried out based on probability in adjustment of cache notification information and regularity of regional content popularity,increasing the cache probability of high popularity content and the difference of adjacent cache;The local attraction potential field is established by using the cache information,and the whole network attraction potential field is established by the content source,routing selections are based on the attraction potential field,realizing the nearest response to content request.Simulation results show that this strategy can reduce the average request delay,increase the cache hit ratio,improving the network transmission performance with a small amount of storage and transmission overhead.