RTT-based Caching Policies to Improve User-Centric Performance in CCN

Content-Centric Networking (CCN) is an attractive future Internet architecture that enables rapid data retrieval due to its native in-network caching mechanism. However, existing caching policies in CCN do not always perform effectively in terms of the user-centric performance that is typically measured by the content download time. This is because they have been designed to improve network-centric performances, such as cache hit ratio and hop count. In this paper, we focus on the Round-Trip Time (RTT) computed at routers, and present two caching policies based on the RTT in order to achieve the high user-centric performance. Our policies have the advantage that they can be deployed with no modification of the CCN packet structure in contrast to the existing ones. This paper demonstrates that our policies achieve much shorter download time than the existing ones over various network topologies, and provides deep insights on caching policies to improve the user-centric performance.