关键词: 信息中心网络, 内置缓存, 缓存策略

Abstract: The growing demand for content is straining the current Internet, and prompting the academic community to put forward several information centric future network architectures. These architectures transform the host-centric communication paradigm into content-centric. One of the most important features of Information Centric Networking（ICN） is to use in-network caching to reduce the delay of retrieving content, save network bandwidth and alleviate network congestion. Compared with the traditional Content Distribution Network（CDN）, Peer to Peer（P2P） and Web caching system, ICN caching system presents a series of new features. Firstly, the challenges of new caching features on the research of ICN are analyzed. Then, the optimization methods of cache in ICN are elaborated from various aspects, and the different cache strategies are analyzed and compared in detail. Finally, the future research directions are presented and the paper is concluded.

Key words: Information Centric Networking（ICN）, in-network caching, caching strategy