In Content-Centric network (CCN), the capacity of router nodes caches the contents to satisfy the requests from subsequent consumers, and reduce the network overhead. Considering the limited cache capacity, the update of cached contents becomes a key element affecting the caching performance for the future 6G network. In this paper, a replacement strategy based content popularity and cache gain (PGR) is proposed for 6G-CCN. In the proposed scheme, the popularity of contents in the current cycle is determined according to the time interval and frequency of consumers’ requests. In addition, the distance between the router node and consumer affects the gain of caching. Further considering the dynamic popularity of content and gain of caching, a realistic content value function is provided. When the cache space reaches the upper bound, for the router node, the existing content with lower value will be replaced by newly arrived content with a higher value. Simulation results show that, compared with the conventional least frequently used (LFU) and least recently used (LRU), the proposed replacement strategy can effectively improve the space utilization and cache hit rate of router nodes, as well as reduce the average hops of consumers’ content acquisition for 6G-CCN.

在以内容为中心的网络（CCN）中，路由器节点的容量可以缓存内容以满足后续使用者的请求，并减少网络开销。考虑到有限的缓存容量，缓存内容的更新成为影响未来6G网络缓存性能的关键因素。本文针对6G-CCN，提出了一种基于内容流行度和缓存增益（PGR）的替换策略。在提出的方案中，根据消费者请求的时间间隔和频率来确定当前周期中内容的流行度。另外，路由器节点与使用者之间的距离会影响缓存的获得。进一步考虑内容的动态流行和缓存的获得，提供了现实的内容价值功能。当缓存空间达到上限时，对于路由器节点，具有较低值的现有内容将被具有较高值的​​新到达内容替换。仿真结果表明，与常规的最少使用频率（LFU）和最近最少使用时间（LRU）相比，所提出的替换策略可以有效提高路由器节点的空间利用率和缓存命中率，并减少用户的平均跳数。用于6G-CCN的内容获取。