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

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.

Abstract: 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.