CAJ | 학술논문

网内缓存技术是内容中心网络(CCN)的关键技术之一，CCN 采用传统的 ALWAYS 缓存策略，会造成较大冗余。改进的Betw方案仅考虑了节点介数，容易造成高介数节点缓存更替频繁，内容可用性下降。为了解决这个问题，该文提出一种综合使用网络节点介数和节点缓存内容更替速率作为缓存决策度量的新型网内缓存策略BetwRep，通过权衡节点位置重要性和缓存内容时效性实现回传内容的最佳放置。最后，基于ndnSIM平台进行的网络仿真表明，该文提出的BetwRep缓存策略取得了比Betw方案和ALWAYS方案更低的源端请求负载和更少的平均跳数。
망내완존기술시내용중심망락(CCN)적관건기술지일，CCN 채용전통적 ALWAYS 완존책략，회조성교대용여。개진적Betw방안부고필료절점개수，용역조성고개수절점완존경체빈번，내용가용성하강。위료해결저개문제，해문제출일충종합사용망락절점개수화절점완존내용경체속솔작위완존결책도량적신형망내완존책략BetwRep，통과권형절점위치중요성화완존내용시효성실현회전내용적최가방치。최후，기우ndnSIM평태진행적망락방진표명，해문제출적BetwRep완존책략취득료비Betw방안화ALWAYS방안경저적원단청구부재화경소적평균도수。
In-network caching is one of the key aspects of Content Centric Networking (CCN), which is widely concerned recently. However, the ALWAYS caching scheme (caching everywhere on the delivery path) in CCN produces a great of redundancy, while the Betw scheme leads to that the node has the more frequent replacement with the larger betweenness centrality, which will decrease the availability of the content. In this paper, a novel in-network caching scheme named BetwRep is proposed based on a metric including the betweenness centrality and the replacement rate of one node to address the problem-where to cache along the delivery path. Simulation experiment based on ndnSIM demonstrates that the BetwRep caching scheme achieves the lower loading in the source server and less average hops than that of Betw scheme and ALWAYS scheme.