基于散粒噪声模型的协作缓存放置策略  

Cooperative cache placement strategy based on SNM model

作　　者：张涵 胡宏林 ZHANG Han;HU Hong-lin(Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201210,China;University of Chinese Academy of Sciences,Beijing 100049,China;School of Information Science and Technology,ShanghaiTech University,Shanghai 201210,China)

机构地区：[1]中国科学院上海高等研究院,上海201210 [2]中国科学院大学,北京100049 [3]上海科技大学信息科学与技术学院,上海201210

出　　处：《计算机工程与设计》2023年第11期3201-3207,共7页Computer Engineering and Design

基　　金：国家重点研发计划基金项目(2020YFB1806606);国家自然科学基金项目(61801460);浦东新区专项基金项目(PKX2020-D12)。

摘　　要：为解决缓存中Zipf模型的适用性缺陷,以表征实际文件的流行度分布,提出一种基于SNM模型,通过设备间协作的缓存放置方案。利用SNM模型,解决Zipf模型难以反映动态流行度的问题。在此基础上利用基于D2D设备和Helper节点设备组成的混合网络,解决Zipf模型不能表征局部流行度问题。通过凸差算法得到最优的缓存文件放置。仿真结果表明,与原有缓存放置算法相比,提出算法缓解了BS端拥塞的问题,提升了总体的缓存命中率,具有更高的卸载增益。To solve the applicability defects of Zipf model used in caching,a caching scheme with collaboration between devices based on shot noise model(SNM)was proposed to represent the prevalence distribution of real files.The SNM model was used to replace the Zipf model to reflect the dynamic popularity.A hybrid network architecture with both D2D(device to device)devices and Helper nodes solved the problem that the Zipf model can’t represent the local popularity.The optimal cache placement was obtained using difference convex algorithm.Results show that the proposed method has higher cache hit probability and offloading gain to users in the network compared with the original cache method.

关 键 词：散粒噪声模型 缓存 端到端通信 卸载增益 目标函数 信息中心网络 非凸优化 

分 类 号：TN925[电子电信—通信与信息系统]