Lifetime-based greedy caching approach for content-centric networking

In Content-centric Networking (CCN), in-network caching can enhance content delivery at a global scale without requiring special infrastructure. In this paper, we propose a lifetime-based greedy caching approach (LBGC) which involves both caching decision and cache replacement. Contents are preferred to be stored in nodes with high betweenness centrality, and only expired cache items can be replaced by new arrival contents, which differs from least recently used (LRU) strategy and guarantees the caching of popular contents. Simulation results indicate that LBGC can improve the cache hit ratio and reduce average hops to get content items compared with other caching approaches.