{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,16]],"date-time":"2026-07-16T14:37:26Z","timestamp":1784212646274,"version":"3.55.0"},"reference-count":63,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2022,7,11]],"date-time":"2022-07-11T00:00:00Z","timestamp":1657497600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"National Natural Science Foundation of China","award":["No. 62101349"],"award-info":[{"award-number":["No. 62101349"]}]},{"name":"National Natural Science Foundation of China","award":["No. RCB20200714114956153"],"award-info":[{"award-number":["No. RCB20200714114956153"]}]},{"name":"National Natural Science Foundation of China","award":["No. CCF-1908308"],"award-info":[{"award-number":["No. CCF-1908308"]}]},{"name":"Shenzhen Science and Technology Program","award":["No. 62101349"],"award-info":[{"award-number":["No. 62101349"]}]},{"name":"Shenzhen Science and Technology Program","award":["No. RCB20200714114956153"],"award-info":[{"award-number":["No. RCB20200714114956153"]}]},{"name":"Shenzhen Science and Technology Program","award":["No. CCF-1908308"],"award-info":[{"award-number":["No. CCF-1908308"]}]},{"name":"National Science Foundation","award":["No. 62101349"],"award-info":[{"award-number":["No. 62101349"]}]},{"name":"National Science Foundation","award":["No. RCB20200714114956153"],"award-info":[{"award-number":["No. RCB20200714114956153"]}]},{"name":"National Science Foundation","award":["No. CCF-1908308"],"award-info":[{"award-number":["No. CCF-1908308"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Network"],"abstract":"<jats:p>Reconfigurable intelligent surfaces (RISs) offer the potential to customize the radio propagation environment for wireless networks. To fully exploit the advantages of RISs in wireless systems, the phases of the reflecting elements must be jointly designed with conventional communication resources, such as beamformers, the transmit power, and computation time. However, due to the unique constraints on the phase shifts and the massive numbers of reflecting units and users in large-scale networks, the resulting optimization problems are challenging to solve. This paper provides a review of the current optimization methods and artificial-intelligence-based methods for handling the constraints imposed by RISs and compares them in terms of the solution quality and computational complexity. Future challenges in phase-shift optimization involving RISs are also described, and potential solutions are discussed.<\/jats:p>","DOI":"10.3390\/network2030025","type":"journal-article","created":{"date-parts":[[2022,7,12]],"date-time":"2022-07-12T03:50:36Z","timestamp":1657597836000},"page":"398-418","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":40,"title":["Phase Shift Design in RIS Empowered Wireless Networks: From Optimization to AI-Based Methods"],"prefix":"10.3390","volume":"2","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2994-7217","authenticated-orcid":false,"given":"Zongze","family":"Li","sequence":"first","affiliation":[{"name":"Peng Cheng Laboratory, Shenzhen 518038, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shuai","family":"Wang","sequence":"additional","affiliation":[{"name":"Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qingfeng","family":"Lin","sequence":"additional","affiliation":[{"name":"Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1112-057X","authenticated-orcid":false,"given":"Yang","family":"Li","sequence":"additional","affiliation":[{"name":"Shenzhen Research Institute of Big Data, Shenzhen 518172, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9638-7048","authenticated-orcid":false,"given":"Miaowen","family":"Wen","sequence":"additional","affiliation":[{"name":"School of Electronics and Information Engineering, South China University of Technology, Guangzhou 510640, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yik-Chung","family":"Wu","sequence":"additional","affiliation":[{"name":"Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2062-131X","authenticated-orcid":false,"given":"H. Vincent","family":"Poor","sequence":"additional","affiliation":[{"name":"Department of Electrical and Computer Engineering, Princeton University, Princeton, NJ 08544, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2022,7,11]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"3313","DOI":"10.1109\/TCOMM.2021.3051897","article-title":"Intelligent Reflecting Surface-Aided Wireless Communications: A Tutorial","volume":"69","author":"Wu","year":"2021","journal-title":"IEEE Trans. Commun."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"798","DOI":"10.1109\/OJCOMS.2020.3002955","article-title":"Reconfigurable Intelligent Surfaces vs. Relaying: Differences, Similarities, and Performance Comparison","volume":"1","author":"Ntontin","year":"2020","journal-title":"IEEE Open J. Commun. 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