A Survey of Edge Caching:Key Issues and Challenges  

作　　者：Hanwen Li Mingtao Sun Fan Xia Xiaolong Xu Muhammad Bilal 

机构地区：[1]School of Computer Science,Nanjing University of Information Science and Technology,Nanjing 210044,China [2]Shandong Provincial University Laboratory for Protected Horticulture,Weifang University of Science and Technology,Weifang 262700,China [3]Reading Academy,Nanjing University of Information Science and Technology,Nanjing 210044,China [4]School of Software,Nanjing University of Information Science and Technology,Nanjing 210044,China [5]Department of Computer Engineering,Hankuk University of Foreign Studies,Yongin-si 17035,Republic of Korea

出　　处：《Tsinghua Science and Technology》2024年第3期818-842,共25页清华大学学报（自然科学版（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.92267104);the Natural Science Foundation of Jiangsu Province of China(No.BK20211284);Financial and Science Technology Plan Project of Xinjiang Production and Construction Corps(No.2020DB005).

摘　　要：With the rapid development of mobile communication technology and intelligent applications,the quantity of mobile devices and data traffic in networks have been growing exponentially,which poses a great burden to networks and brings huge challenge to servicing user demand.Edge caching,which utilizes the storage and computation resources of the edge to bring resources closer to end users,is a promising way to relieve network burden and enhance user experience.In this paper,we aim to survey the edge caching techniques from a comprehensive and systematic perspective.We first present an overview of edge caching,summarizing the three key issues regarding edge caching,i.e.,where,what,and how to cache,and then introducing several significant caching metrics.We then carry out a detailed and in-depth elaboration on these three issues,which correspond to caching locations,caching objects,and caching strategies,respectively.In particular,we innovate on the issue“what to cache”,interpreting it as the classification of the“caching objects”,which can be further classified into content cache,data cache,and service cache.Finally,we discuss several open issues and challenges of edge caching to inspire future investigations in this research area.

关 键 词：edge caching edge computing caching location caching object caching strategy 5G networkarchitecture Internet of Things(IoT) 

分 类 号：U495[交通运输工程—交通运输规划与管理] TN929.5[交通运输工程—道路与铁道工程] TP18[电子电信—通信与信息系统]