{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,7,30]],"date-time":"2025-07-30T15:03:30Z","timestamp":1753887810722,"version":"3.41.2"},"reference-count":26,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2021,4,19]],"date-time":"2021-04-19T00:00:00Z","timestamp":1618790400000},"content-version":"vor","delay-in-days":108,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100004731","name":"Natural Science Foundation of Zhejiang Province","doi-asserted-by":"publisher","award":["LQ20F040001"],"award-info":[{"award-number":["LQ20F040001"]}],"id":[{"id":"10.13039\/501100004731","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["61801155"],"award-info":[{"award-number":["61801155"]}],"id":[{"id":"10.13039\/501100001809","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":[[2021,1]]},"abstract":"<jats:p>The Internet of things (IoT) has emerged as a platform for connecting massive physical devices to collect and analyze data for decision\u2010making. Wireless devices in IoT are usually energy\u2010constrained and thus need to be powered by a stable and reliable energy source in order to maintain a long network lifetime. An unmanned aerial vehicle (UAV) as an energy source is a proper and applicable way to supply energy to wireless devices in IoT, due to its flexibility and potential of providing line\u2010of\u2010sight (LOS) links for wireless air\u2010to\u2010ground channels. In this paper, a UAV\u2010aided wireless powered relay communication system is presented, where a UAV firstly emits energy to a source and a relay, and then, the source and relay cooperatively transmit information to their destination. To explore the performance limit of the system, a problem is formulated by jointly optimizing the position of the UAV and time allocation to maximize the achievable information rate of the system. By deriving the explicit expressions of the optimal position of UAV and optimal time fraction, the nonconvex optimization problem is efficiently solved. Simulation results show that our proposed method significantly outperforms the benchmark methods.<\/jats:p>","DOI":"10.1155\/2021\/5537517","type":"journal-article","created":{"date-parts":[[2021,4,19]],"date-time":"2021-04-19T21:22:40Z","timestamp":1618867360000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Joint Position and Time Allocation Optimization of UAV\u2010Aided Wireless Powered Relay Communication Systems"],"prefix":"10.1155","volume":"2021","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4837-4928","authenticated-orcid":false,"given":"Xiaofei","family":"Di","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3796-6971","authenticated-orcid":false,"given":"Yang","family":"Chen","sequence":"additional","affiliation":[]}],"member":"311","published-online":{"date-parts":[[2021,4,19]]},"reference":[{"key":"e_1_2_9_1_2","doi-asserted-by":"publisher","DOI":"10.1109\/JIOT.2019.2948888"},{"key":"e_1_2_9_2_2","doi-asserted-by":"publisher","DOI":"10.1109\/JIOT.2021.3057360"},{"volume-title":"Workshop on 3GPP Submission Towards IMT-2020","year":"2018","author":"Webb M.","key":"e_1_2_9_3_2"},{"key":"e_1_2_9_4_2","doi-asserted-by":"publisher","DOI":"10.1109\/TWC.2016.2621766"},{"key":"e_1_2_9_5_2","doi-asserted-by":"publisher","DOI":"10.1109\/TWC.2018.2815563"},{"key":"e_1_2_9_6_2","doi-asserted-by":"publisher","DOI":"10.1109\/TWC.2013.112513.130760"},{"key":"e_1_2_9_7_2","first-page":"1728","article-title":"Optimum wirelessly powered relaying","volume":"22","author":"Zhong C.","year":"2015","journal-title":"IEEE Signal Processing Letters"},{"key":"e_1_2_9_8_2","doi-asserted-by":"publisher","DOI":"10.1109\/TVT.2020.3001403"},{"key":"e_1_2_9_9_2","doi-asserted-by":"publisher","DOI":"10.1109\/TWC.2016.2531652"},{"key":"e_1_2_9_10_2","doi-asserted-by":"publisher","DOI":"10.1109\/LNET.2020.2989130"},{"key":"e_1_2_9_11_2","doi-asserted-by":"publisher","DOI":"10.1109\/TVT.2019.2961993"},{"key":"e_1_2_9_12_2","doi-asserted-by":"publisher","DOI":"10.1109\/TCOMM.2020.2971488"},{"key":"e_1_2_9_13_2","doi-asserted-by":"publisher","DOI":"10.1109\/TVT.2020.3026788"},{"key":"e_1_2_9_14_2","doi-asserted-by":"publisher","DOI":"10.1109\/LCOMM.2016.2633248"},{"key":"e_1_2_9_15_2","doi-asserted-by":"publisher","DOI":"10.1109\/TVT.2020.2975031"},{"key":"e_1_2_9_16_2","doi-asserted-by":"publisher","DOI":"10.1109\/TWC.2019.2950301"},{"key":"e_1_2_9_17_2","doi-asserted-by":"publisher","DOI":"10.1109\/JSAC.2018.2864421"},{"key":"e_1_2_9_18_2","doi-asserted-by":"publisher","DOI":"10.1109\/TCOMM.2019.2896973"},{"key":"e_1_2_9_19_2","doi-asserted-by":"publisher","DOI":"10.1109\/LCOMM.2018.2876869"},{"key":"e_1_2_9_20_2","doi-asserted-by":"publisher","DOI":"10.1109\/ACCESS.2020.2971692"},{"key":"e_1_2_9_21_2","doi-asserted-by":"crossref","unstructured":"ChenS. LiX. LuoC. JiH. andZhangH. Energy-efficient power position and time control in UAV-assisted wireless networks Proc. IEEE Globecom Workshops Decemeber 2019 Waikoloa HI USA 1\u20136.","DOI":"10.1109\/GCWkshps45667.2019.9024568"},{"key":"e_1_2_9_22_2","doi-asserted-by":"publisher","DOI":"10.1109\/TVT.2016.2588441"},{"key":"e_1_2_9_23_2","doi-asserted-by":"publisher","DOI":"10.1109\/MVT.2015.2411191"},{"key":"e_1_2_9_24_2","unstructured":"HapsariW. Study on enhanced LTE support for aerial vehicles 3GPP 2017 Sophia Antipolis France Rep. 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