基于辅助设备的D2D集群的文件块缓存策略研究  

The File Chunk Cache Strategy for D2D Cluster Based on Mobile Helpers

作　　者：周仙 宋晖[1] 潘达儒[1] 黄旭 ZHOU Xian;SONG Hui;PAN Daru;HUANG Xu(School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou 510006, China)

机构地区：[1]华南师范大学物理与电信工程学院,广州510006

出　　处：《华南师范大学学报（自然科学版）》2021年第3期106-112,共7页Journal of South China Normal University(Natural Science Edition)

基　　金：国家自然科学基金项目(61801184,61771206,61471175)。

摘　　要：为了解决D2D缓存命中概率的最优化问题,在集群用户中加入了移动辅助设备(HEs)缓存,同时,提出了基于辅助设备的D2D集群的流性文件块分批缓存策略(FCPhit):首先,将有相似文件请求的用户群置于一个集群中;然后,将用户分批并将流行文件分为若干块,用户设备缓存文件的第1块,移动辅助设备缓存其他文件块.并与已有的最流行缓存策略(MPhit)、最优缓存策略(OCPhit)和等概率缓存策略(EPRC)进行对比实验,结果表明:FCPhit策略可以有效提高系统的缓存命中概率.In order to optimize the D2D cache hit ratio,the mobile helper equipments(HEs)cache is added to the cluster users.At the same time,a popular file chunk batch cache strategy(FCPhit)based on the helper equipment is proposed.Firstly,users with similar file requests are clustered into one cluster.Then,the users are batched and the popular file is divided into several chunks.The user equipment caches the first chunk of the file and HEs cache the other file chunks.Finally,the strategy is compared with the most popular existing caching strategy(MPhit),the optimal caching strategy(OCPhit),and the equal probability random cache strategy(EPRC).The results show that the present strategy can effectively improve the cache hit ratio of the system.

关 键 词：D2D通信 缓存策略 辅助设备 集群 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]