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Open Access

A Survey of Edge Caching: Key Issues and Challenges

School of Computer Science, Nanjing University of Information Science and Technology, Nanjing 210044, China
Shandong Provincial University Laboratory for Protected Horticulture, Weifang University of Science and Technology, Weifang 262700, China
Reading Academy, Nanjing University of Information Science and Technology, Nanjing 210044, China
School of Software, Nanjing University of Information Science and Technology, Nanjing 210044, China
Department of Computer Engineering, Hankuk University of Foreign Studies, Yongin-si 17035, Republic of Korea
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Abstract

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.

Keywords

edge cachingedge computingcaching locationcaching objectcaching strategy5G network architectureInternet of Things (IoT)

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Tsinghua Science and Technology
Volume 29 Issue 3,
June 2024
Pages 818-842
DOI: 10.26599/TST.2023.9010051
Cite this article:
Li H, Sun M, Xia F, et al. A Survey of Edge Caching: Key Issues and Challenges. Tsinghua Science and Technology, 2024, 29(3): 818-842. https://doi.org/10.26599/TST.2023.9010051

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Received: 25 February 2023
Revised: 07 May 2023
Accepted: 23 May 2023
Published: 04 December 2023
© The Author(s) 2024.

The articles published in this open access journal are distributed under the terms of theCreative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/).
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