{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T00:56:56Z","timestamp":1760144216124,"version":"build-2065373602"},"reference-count":20,"publisher":"MDPI AG","issue":"4","license":[{"start":{"date-parts":[[2024,3,31]],"date-time":"2024-03-31T00:00:00Z","timestamp":1711843200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Instituto Polit\u00e9cnico Nacional","award":["SIP 20240671"],"award-info":[{"award-number":["SIP 20240671"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Information"],"abstract":"<jats:p>In modern and future communication systems, we expect peaks of traffic that largely exceed the capacity of the system, since they are originally designed to support normal traffic loads. Such peaks can be caused by emergency events and cultural or sporting gatherings, among others. Indeed, implementing more channels than the ones required in normal traffic conditions would entail higher costs and energy consumption. As such, when a traffic peak arrives, the system performance is greatly affected. To this end, we propose the use of mobile channels that assist cellular systems to increase the capacity of the network for a certain period. In this paper, we derive the blocking probability of a UAV (Unmanned Aerial Vehicle)-assisted cellular system to temporarily increase the capacity of the communication network in case of a traffic overload. The analysis presented in this work allows a careful design of future communication systems requiring fewer channels, that can serve users in normal traffic load conditions while using UAVs to maintain an adequate blocking probability when the traffic load increases. To this end, we develop the ErlangU formula, similar to the ErlangB formula for a conventional voice service cellular system.<\/jats:p>","DOI":"10.3390\/info15040192","type":"journal-article","created":{"date-parts":[[2024,3,31]],"date-time":"2024-03-31T13:32:56Z","timestamp":1711891976000},"page":"192","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Erlang-U: Blocking Probability of UAV-Assisted Cellular Systems"],"prefix":"10.3390","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1020-6806","authenticated-orcid":false,"given":"Mario E.","family":"Rivero-Angeles","sequence":"first","affiliation":[{"name":"Computer Research Center, Instituto Polit\u00e9cnico Nacional (CIC-IPN), Ciudad de Mexico 07700, Mexico"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2663-0767","authenticated-orcid":false,"given":"Iclia","family":"Villordo-Jimenez","sequence":"additional","affiliation":[{"name":"Computer Research Center, Instituto Polit\u00e9cnico Nacional (CIC-IPN), Ciudad de Mexico 07700, Mexico"}]},{"given":"Izlian Y.","family":"Orea-Flores","sequence":"additional","affiliation":[{"name":"Computer Research Center, Instituto Polit\u00e9cnico Nacional (CIC-IPN), Ciudad de Mexico 07700, Mexico"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7248-1873","authenticated-orcid":false,"given":"No\u00e9","family":"Torres-Cruz","sequence":"additional","affiliation":[{"name":"Computer Research Center, Instituto Polit\u00e9cnico Nacional (CIC-IPN), Ciudad de Mexico 07700, Mexico"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0440-6094","authenticated-orcid":false,"given":"Angel","family":"Pretel\u00edn Ric\u00e1rdez","sequence":"additional","affiliation":[{"name":"Computer Research Center, Instituto Polit\u00e9cnico Nacional (CIC-IPN), Ciudad de Mexico 07700, Mexico"}]}],"member":"1968","published-online":{"date-parts":[[2024,3,31]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"6578","DOI":"10.1109\/TWC.2020.3004162","article-title":"Age of information in a cellular internet of UAVs: Sensing and communication trade-off design","volume":"19","author":"Zhang","year":"2020","journal-title":"IEEE Trans. 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