物联网中时间驱动的ICN缓存机制研究

在物联网架构设计中采用信息中心网络(information centric networking,ICN)的思想将非常有利于提高信息与数据的传输效率,但现有的ICN缓存机制难以满足物联网用户对信息准确度的要求,尤其是在时间维度上的严格要求.针对这一问题,利用ICN基于内容名命名的方式和内置缓存的特性,提出了一种新的能应用于物联网的时间驱动的普适性缓存方案,创新地在兴趣包和数据包中添加用于精确匹配的时间戳字段.研究了一种时间匹配算法,目的是向消费者返回满足时间容忍阈值的内容,依据内容流行度和时间请求概率,对到达节点的数据包做出缓存决策,通过仿真验证所提方案的有效性.与用户驱动的信息新鲜度机制相比,时间驱动的普适性缓存方案有效地提高了缓存命中率和信息获取的准确率.

Time-driven ICN caching mechanism in internet of things

Adopting the thought of information centric networking (ICN) in the architecture design of internet of things (IoT) will be extremely beneficial for improving the transmission efficiency of information and data.Nevertheless,the existing ICN cache mechanisms are difficult to satisfy the strict requirements of IoT consumers in information accuracy,especially in terms of time dimension.To address this question,a novel time-driven universal caching scheme applied to IoT is proposed by utilizing the ICN features of name-based routing and in-network caching,and the proposed scheme innovatively adds the timestamp field in interest and data packages for exact matching.In the first place,a time matching algorithm is researched aiming at returning the content that satisfies the time tolerance threshold to the consumer.In the next place,the node makes the cache decision for returned data according to the content popularity and time request probability.Finally,the effectiveness of the proposed scheme is verified by the simulation.Compared with the consumer driven information freshness approach,the proposed time-driven universal caching scheme improves both cache hit rate and accuracy of information acquisition.