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内容中心网络(Content-Centric Network,CCN)是未来互联网的重要发展方向。网内缓存是CCN网络的重要特征,对CCN内容传输性能具有重要影响。网内缓存的内容发现效率与网内缓存性能密切相关。传统CCN网络缓存发现方法是通过请求包在数据平面转发,沿途机会性地命中缓存实现的,具有一定的随机性、盲目性,可能导致缓存内容无法被高效利用。本文提出一种在控制平面解决缓存可用性的方法,结合拓扑、缓存容量以及用户请求分布计算出“值得”缓存的内容进行存储,同时将其向外通告,使其参与路由计算,以便后续请求快速准确地发现并利用缓存内容。实验结果表明,本文方法可使缓存命中率提高20%左右,服务器负载降低15%左右。
Content-Centric Network (CCN) is an important development direction of the future internet. Intranet caching is an important feature of CCN networks and has an important impact on the content delivery performance of CCN. Content discovery efficiency of intranet caching is closely related to intranet caching performance. The traditional CCN network cache discovery method is to forward the request packet on the data plane and opportunistically hit the cache implementation along the way, with a certain degree of randomness and blindness, which may result in the cache content being unable to be efficiently utilized. This paper proposes a method to solve the problem of cache availability in the control plane. It combines the topology, the cache size and the user request distribution to calculate the “worth” cache content for storage. At the same time, it advertises it out to make it participate in routing calculation. Request fast and accurate discovery and use of cached content. The experimental results show that this method can increase the cache hit rate by about 20% and the server load by about 15%.