Popularity And Life-span Based Cache Scheme For Content-Centric Network

Content-Centric Network(CCN)is the research hotspot of next-generation Internet architecture,which is based on the content itself.It is a bold change to the existing Internet system based on host communication The Using the network built-in cache to improve content acquisition and transmission rate is one of the important features of CCN.Unlike traditional caching modes such as Web caching,CDN,etc.,CCN caching presents a pervasive,transparent,fine-grained feature.Some traditional caching algorithms no longer fit the needs of CCN caching,so how to develop an efficient cache strategy has become one of the core research questions of content center network.This paper first introduces the research background of the future network architecture,and discusses and analyzes some existing architecture such as CCN/NDN,DONA,PSIRP/PURSUIT and NetInf.Then it mainly introduces the CCN/NDN system,including its architecture and key technologies,after that it moves focus to CCN caching technology.The work and major contributions of this paper include the following two points:(1)The third chapter,based on the concept of network content popularity and the concept of node cache life-span,puts forward the cache resolution scheme based on content popularity and the cache replacement scheme based on cache life-span.This strategy reduces the response speed of the user request by moving the hotter content to the edge of the network.At the same time,the living space is reserved for non-hot content on the upper layer of the network,and the diversity of the internal cache is preserved.(2)In the fourth chapter,the CCN network model is simulated based on java,and the performance of the system under the ALWAYS&LRU,LCD&LRU,P&L cache strategy is simulated and compared.The simulation results show that the proposed strategy can improve the user's access experience and reduce the load of the source content server,which makes the network cache performance be improved.