@inproceedings{14b9192f4d7d471f9b4636c2eb8a7b5f,
title = "Network cost minimization for reconfigurable intelligent surface aided edge caching",
abstract = "In this paper, a new RIS-aided edge caching system is proposed, where a network cost minimization problem is formulated to optimize content placement at cache units, active beamforming at base station and passive phase shifting at RIS. After decoupling the content placement with the hybrid beamforming, we propose an alternating optimization algorithm to tackle the active beamforming and passive phase shifting. For active beamforming, we transform the problem into a semidefinite programming (SDP). For passive phase shifting, we propose a block coordinate descent method and a conjugate gradient algorithm to deal with the non-convex unit-modulus constraints. Numerical results show that our RIS-aided edge caching design can effectively decrease the network cost in terms of backhaul capacity and power consumption.",
keywords = "Beamforming, Edge caching, Manifold optimization, Network cost, Reconfigurable intelligent surface (RIS)",
author = "Yingyang Chen and Miaowen Wen and Ertugrul Basar and Wu, \{Yik Chung\} and Li Wang and Weiping Liu",
note = "Publisher Copyright: {\textcopyright} 2021 IEEE.; 2021 IEEE Wireless Communications and Networking Conference Workshops, WCNCW 2021 ; Conference date: 29-03-2021",
year = "2021",
month = mar,
day = "29",
doi = "10.1109/WCNCW49093.2021.9419999",
language = "English",
series = "2021 IEEE Wireless Communications and Networking Conference Workshops, WCNCW 2021",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
booktitle = "2021 IEEE Wireless Communications and Networking Conference Workshops, WCNCW 2021",
address = "United States",
}