基于选择存储的CCN网络缓存发现方法

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。

A Cache Discovery Method Based on Selective Caching in CCN

As a promising direction of future Internet, Content-Centric Network (CCN) has attracted worldwide attention. Caching is an important feature of CCN network, which has significant impacts on the performance of content transmission. The efficiency of cached content discovery has a close relationship with the caching performance. In traditional methods of cache discovery in CCN,requests are forwarded in the data plane and caches are hit along the path in an opportunistic manner. This approach has the characteristic of randomness and blindness, which may make the cache content not be used efficiently. This paper presents a new method to achieve the availability of caching in the control plane, which utilizes topology, cache capacity and user requests distribution to calculate the worthy cache contents and store them. Meanwhile, the corresponding cache contents are announced and participate in the routing calculation, so that the subsequent requests can quickly and accurately find and exploit these cache contents. The experimental results show that this method can improve the rate of cache hit by about 20% and reduce the server load by ab out 15%.