Publication: Exploiting reconfigurable intelligent surfaces in edge caching: joint hybrid beamforming and content placement optimization
dc.contributor.coauthor | Chen, Yingyang | |
dc.contributor.coauthor | Wen, Miaowen | |
dc.contributor.coauthor | Wu, Yik-Chung | |
dc.contributor.coauthor | Wang, Li | |
dc.contributor.coauthor | Liu, Weiping | |
dc.contributor.department | Department of Electrical and Electronics Engineering | |
dc.contributor.kuauthor | Başar, Ertuğrul | |
dc.contributor.schoolcollegeinstitute | College of Engineering | |
dc.date.accessioned | 2024-11-09T11:59:41Z | |
dc.date.issued | 2021 | |
dc.description.abstract | Edge caching can effectively reduce backhaul burden at core network and increase quality-of-service at wireless edge nodes. However, the beneficial role of edge caching cannot be fully realized when the offloading link is in deep fade. Fortunately, the impairments induced by wireless propagation environments could be renovated by a reconfigurable intelligent surface (RIS). 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 subproblem with the hybrid beamforming design, we propose an alternating optimization algorithm to tackle the active beamforming and passive phase shifting. For active beamforming, we transfer the problem into a semidefinite programming (SDP) and prove that the optimal solution of SDP is always rank-one. For passive phase shifting, we introduce the block coordinate descent method to alternately optimize the auxiliary variables and the RIS phase shifts. Further, a conjugate gradient algorithm based on manifold optimization is proposed 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 by improving the quality of offloading links. | |
dc.description.fulltext | YES | |
dc.description.indexedby | WOS | |
dc.description.indexedby | Scopus | |
dc.description.issue | 12 | |
dc.description.openaccess | YES | |
dc.description.publisherscope | International | |
dc.description.sponsoredbyTubitakEu | TÜBİTAK | |
dc.description.sponsorship | National Nature Science Foundation of China | |
dc.description.sponsorship | Natural Science Foundation of Guangdong Province | |
dc.description.sponsorship | Fundamental Research Funds for the Central Universities | |
dc.description.sponsorship | National Key Research and Development Program of China | |
dc.description.sponsorship | Beijing Municipal Natural Science Foundation | |
dc.description.sponsorship | Scientific and Technological Research Council of Turkey (TÜBİTAK) | |
dc.description.version | Author's final manuscript | |
dc.description.volume | 20 | |
dc.identifier.doi | 10.1109/TWC.2021.3087912 | |
dc.identifier.eissn | 1558-2248 | |
dc.identifier.embargo | NO | |
dc.identifier.filenameinventoryno | IR03167 | |
dc.identifier.issn | 1536-1276 | |
dc.identifier.quartile | Q1 | |
dc.identifier.scopus | 2-s2.0-85112149059 | |
dc.identifier.uri | https://doi.org/10.1109/TWC.2021.3087912 | |
dc.identifier.wos | 728926400010 | |
dc.keywords | Beamforming | |
dc.keywords | Edge caching | |
dc.keywords | Manifold optimization | |
dc.keywords | Network cost | |
dc.keywords | Reconfigurable intelligent surface (RIS) | |
dc.language.iso | eng | |
dc.publisher | Institute of Electrical and Electronics Engineers (IEEE) | |
dc.relation.grantno | 61871190 | |
dc.relation.grantno | 61871416 | |
dc.relation.grantno | 62001191 | |
dc.relation.grantno | U2066201 | |
dc.relation.grantno | 2018B030306005 | |
dc.relation.grantno | 21620351 | |
dc.relation.grantno | 2020YFC1511801 | |
dc.relation.grantno | L192030 | |
dc.relation.grantno | 120E401 | |
dc.relation.ispartof | IEEE Transactions on Wireless Communications | |
dc.relation.uri | http://cdm21054.contentdm.oclc.org/cdm/ref/collection/IR/id/9806 | |
dc.subject | Engineering | |
dc.subject | Telecommunications | |
dc.title | Exploiting reconfigurable intelligent surfaces in edge caching: joint hybrid beamforming and content placement optimization | |
dc.type | Journal Article | |
dspace.entity.type | Publication | |
local.contributor.kuauthor | Başar, Ertuğrul | |
local.publication.orgunit1 | College of Engineering | |
local.publication.orgunit2 | Department of Electrical and Electronics Engineering | |
relation.isOrgUnitOfPublication | 21598063-a7c5-420d-91ba-0cc9b2db0ea0 | |
relation.isOrgUnitOfPublication.latestForDiscovery | 21598063-a7c5-420d-91ba-0cc9b2db0ea0 | |
relation.isParentOrgUnitOfPublication | 8e756b23-2d4a-4ce8-b1b3-62c794a8c164 | |
relation.isParentOrgUnitOfPublication.latestForDiscovery | 8e756b23-2d4a-4ce8-b1b3-62c794a8c164 |
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