Abstract:Information-centric networking (ICN) transforms the network communication mode from the current host-oriented mode to an information-oriented one. Ubiquitous in-network caching is one of the significant features of ICN, which can effectively alleviate server pressure, as well as decrease the user access latency by allowing any nodes in network to cache. However, due to the lack of distribution awareness of content popularity, there are still many problems with the state-of-the-art ICN caching schemes, such as low cache utilization and lack of reasonable planning of cache location. This study proposes a cache coordination scheme based on two-level cache (CSTC) to solve these problems. The content store (CS) of each node is divided into two parts:popularity perception and collaboration allocation. Different caching strategies are applied to cached content with different popularity. At the same time, combined with the popularity filtering and routing mechanism, this scheme reduces cache redundancy and optimizes cache location. Finally, simulation experiments based on real network topology show that CSTC has doubled the number of cached secondary popular content. The cache hit ratio has increased by nearly 50%, and the average round-trip hop count is superior to the existing on-path caching method in most cases.