随着信息时代的高速发展,用户对于数据的请求日益增多.传统的以用户为中心的端到端IP通信已经无法满足用户需求.内容中心网络(content-centric network,CCN)作为一个新颖的网络构架被提出,它将数据的内容和位置分离开来,实现以内容为中心的网络模型,以有效地解决IP通信的弊端.在内容中心网中,每个组块都有自己唯一的名字,用于数据搜索.并且CCN中的路由器都有缓存功能,缓存使用频率高的组块,从而减少网络拥塞,提高网络性能.其中,缓存算法主要分为缓存决定策略和缓存取代策略,其对于整个系统性能的好坏至关重要.针对内容中心网缓存算法进行研究,介绍了CCN网络模型,并针对具体算法做出分析,概括总结了其优缺点.%With the rapid development of information era,the demands of users for data are increasing.Traditional host-centric end-to-end communication cannot meet users' needs.Today's Internet is increasingly used for information dissemination rather than pair-wise communications between end hosts and pays more attention to the content itself rather than where it is physically located.Innovative con-tent-centric network architecture is proposed to handle these problems.In CCN,a file is divided into several chunks and every chunk has its unique ID.Information dissemination and searching are all based on these IDs.In addition,routers in CCN all have buffer memory. Nodes can cache the contents passing through it for a while and deliver them to requesting users.With popular contents cached in nodes, network congestion can be avoided and Internet performance can be improved.In CCN,cache management is a crucial factor to improve performance.The cache management generally works at each router through two kinds of policies called cache decision policy and cache replacement policy.Research firstly introduces CCN node model and then summarizes several typical algorithms' merits and drawbacks.
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