基于通告转移机制的CCN网络缓存替换策略

CCN CACHE REPLACEMENT STRATEGY BASED ON NOTIFICATION TRANSFER MECHANISM

针对内容中心网络(Content-centric Network,CCN)中现有的缓存替换策略考虑问题单一,直接删除替换内容的不足,提出一种基于通告转移机制(Notification Transfer Mechanism,NTM)的CCN网络缓存替换策略。结合动态内容流行度、缓存代价以及时间因子求取内容缓存价值(Content Storage Value,CSV)。依据CSV值判定缓存替换内容,同时建立请求-响应的活动路径,替换内容沿活动路径存储在适合的节点,便于域内网络用户再次请求。仿真实验表明,相对于已有的几种缓存替换算法,该算法能够有效地提高CCN网络平均缓存命中率,降低路由平均请求跳数。

In view of the single consideration of the existing cache replacement strategy in content-centric network(CCN)and the defect of directly deleting the replacement content,this paper proposes a CCN cache replacement strategy based on notification transfer mechanism(NTM).It combined dynamic content popularity,cache cost,and time factor to get the content cache value(CSV).The cache replacement was determined based on the CSV value,and the active path of request-response was established,The replacement content was stored along the active path at the appropriate node,so that the intra-domain network user could request it again.Simulation experiments show that compared with several existing cache replacement algorithms,our algorithm can effectively improve the average cache hit rate of the CCN and reduce the average number of request hops for routing.