{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,13]],"date-time":"2026-05-13T00:27:37Z","timestamp":1778632057164,"version":"3.51.4"},"reference-count":43,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2018,10,23]],"date-time":"2018-10-23T00:00:00Z","timestamp":1540252800000},"content-version":"vor","delay-in-days":295,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100002701","name":"Ministry of Education","doi-asserted-by":"publisher","award":["2016R1D1A1B03934898"],"award-info":[{"award-number":["2016R1D1A1B03934898"]}],"id":[{"id":"10.13039\/501100002701","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Wireless Communications and Mobile Computing"],"published-print":{"date-parts":[[2018,1]]},"abstract":"<jats:p>In this paper, we address the opportunistic scheduling in multitwo user NOMA system consisting of one base station, multinear user, multifar user, and one eavesdropper. To improve the secrecy performance, we propose the users selection scheme, called best\u2010secure\u2010near\u2010user best\u2010secure\u2010far\u2010user (BSNBSF) scheme. The BSNBSF scheme aims to select the best near\u2010far user pair, whose data transmission is the most robust against the overhearing of an eavesdropper. In order to facilitate the performance analysis of the BSNBSF scheme in terms of secrecy outage performance, we derive the exact closed\u2010form expression for secrecy outage probability (SOP) of the selected near user and the tight approximated closed\u2010form expression for SOP of the selected far user, respectively. Additionally, we propose the descent\u2010based search method to find the optimal values of the power allocation coefficients that can minimize the total secrecy outage probability (TSOP). The developed analyses are corroborated through Monte Carlo simulation. Comparisons with the random\u2010near\u2010user random\u2010far\u2010user (RNRF) scheme are performed and show that the proposed scheme significantly improves the secrecy performance.<\/jats:p>","DOI":"10.1155\/2018\/2797824","type":"journal-article","created":{"date-parts":[[2018,10,24]],"date-time":"2018-10-24T00:21:20Z","timestamp":1540340480000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Exploiting Opportunistic Scheduling for Physical\u2010Layer Security in Multitwo User NOMA Networks"],"prefix":"10.1155","volume":"2018","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4851-0811","authenticated-orcid":false,"given":"Kyusung","family":"Shim","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0587-3754","authenticated-orcid":false,"given":"Beongku","family":"An","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2018,10,23]]},"reference":[{"key":"e_1_2_11_1_2","first-page":"1","article-title":"5G Vision and Requirements","author":"IMT-2020 (5G) Promotion Group","year":"2015","journal-title":"White Paper"},{"key":"e_1_2_11_2_2","article-title":"5G radio access: Requirements, concept and technologies","author":"NTT DOCOMO","year":"2014","journal-title":"White Paper"},{"key":"e_1_2_11_3_2","first-page":"16","article-title":"Special articles on 5G technologies toward deployment","volume":"17","author":"Saito K.","year":"2016","journal-title":"NTT DOCOMO Technical Journal"},{"key":"e_1_2_11_4_2","doi-asserted-by":"crossref","unstructured":"SaitoY. 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