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A Learning Approach to Edge Caching with Dynamic Content Library in Wireless Networks

Zhang, X; Zheng, G; Lambotharan, S; Nakhai, MR; Wong, KK; (2020) A Learning Approach to Edge Caching with Dynamic Content Library in Wireless Networks. In: Proceedings of the 2019 IEEE Global Communications Conference (GLOBECOM). IEEE: Waikoloa, HI, USA. Green open access

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Abstract

This paper focuses on joint edge cache placement and content delivery problem at a base station (BS) in the presence of spatio-temporal unknown content dynamics, where the BS can satisfy its users' content demands either directly from its local cache or by fetching from the content server. Unlike the previous works that assume a static content library, we consider a more realistic non-stationary scenario, where new contents are emerging over time at the content library and might be cached at users. We propose that the new contents cached at local users can be utilized by the BS to timely update its flexible portion of cache memory in addition to its routine off-peak main cache update from the content server. We model the caching problem as a non- stationary bandit problem and introduce a user-aided caching algorithm that accounts for the traffic demand variations and the limited caching space at the BS. The proposed algorithm progressively improves the caching policy, with the target of maximizing the weighted content delivery rate to the users in the long run. Simulation results validate that the proposed strategy outperforms various benchmark designs.

Type: Proceedings paper
Title: A Learning Approach to Edge Caching with Dynamic Content Library in Wireless Networks
Event: 2019 IEEE Global Communications Conference (GLOBECOM)
ISBN-13: 978-1-7281-0962-6
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/GLOBECOM38437.2019.9013584
Publisher version: https://doi.org/10.1109/GLOBECOM38437.2019.9013584
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Servers, Libraries, Wireless networks, Base stations, Cache storage, Quality of service
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10094224
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