基于联盟链的边缘缓存系统收益最大化的缓存策略

边缘缓存技术能够将热点内容提前放置在距离用户较近的网络边缘，可以显著降低传输时延、提高网络效率。然而，不同的运营商各自部署边缘设备，投入巨大且缓存内容相互隔离，无法共享。针对此问题，改进了一种基于联盟链的边缘缓存系统架构，运营商部署的边缘设备间能够打破内容隔离，实现更大范围的内容共享。此外，设计了基于智能合约的内容交易流程，使得不同运营商之间的合作变得可信、公平和可追踪。最后，考虑到热门内容的流行程度、文件大小以及传输时延等，对热点内容进行定价，并以收益最大化为目标，通过贪婪算法确定缓存内容放置的位置。仿真实验表明，基于该架构下的收益最大化缓存策略能够有效增加边缘缓存的收益。

Benefit maximization caching strategy in edge cache system based on consortium blockchain

Edge caching technology places hotspots in advance on the edge of the network closer to the users, which can significantly reduce transmission delay and improve network transmission efficiency. However, different operators deploy edge devices independently, which requires a vast investment. Note that the cached contents are isolated from each other and cannot be shared. Aiming at this problem, this paper improved the architecture of an edge cache system based on consortium chain, so that the edge devices deployed by different operators could break the content isolation and achieved a wider range of content sharing. In addition, this paper designed a content transaction process based on smart contract, making the cooperation between different operators credible, fair and traceable. Finally, considering the popularity of popular content, file size, transmission delay, etc., it priced the hotspot content and determined the location of cache content by maximizing benefits. The simulation results show that the benefit maximization caching strategy based on this architecture can effectively increase the revenue of edge caching.