关键词: 信息中心网络（ICN）, 信息命名, 信息缓存, ICN分类, 内容中心网络（CCN）

Abstract: Network requirements are evolved from data communications between two hosts to accessing a large amount of information through networks. The current Internet uses address-centric network communication model, which is suitable for the communications between hosts but not efficient in the communications between hosts and networks. Given this fact, information-centric networking (ICN) becomes the hot spot to meet the new requirements. Firstly, this paper presents the basic idea of ICN, analyzes the features of ICN, and classifies different ICN approaches, including the following aspects: naming, resolving, routing and caching. Secondly, this paper summarizes the five key technologies in ICN which are naming, resolving, routing, distribution and caching, and then analyzes and evaluates the existing ICN schemes. Finally, several key issues in ICN are discussed and future directions are pointed out.

Key words: information-centric networking (ICN), information naming, information cache, ICN classification, content-centric networking (CCN)