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Employing mobile agents (MAs) to collect data from sensors offers a new dimension to reduce and balance their energy consumption but leads to large data collection latency due to MAs\u2019 limited velocity. Most existing research effort focuses on the offline <jats:italic>mobile data collection<\/jats:italic> (MDC), where the MAs collect data from sensors based on preoptimized tours. However, the efficiency of these offline MDC solutions degrades when the data generation of sensors varies. In this paper, we investigate the on\u2010demand MDC; that is, MAs collect data based on the real\u2010time data collection requests from sensors. Specifically, we construct queuing models to describe the <jats:italic>First-Come-First-Serve<\/jats:italic>\u2010based MDC with a single MA and multiple MAs, respectively, laying a theoretical foundation. We also use three examples to show how such analysis guides online MDC in practice.<\/jats:p>","DOI":"10.1155\/2018\/5913981","type":"journal-article","created":{"date-parts":[[2018,4,30]],"date-time":"2018-04-30T23:31:18Z","timestamp":1525131078000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["On\u2010Demand Mobile Data Collection in Cyber\u2010Physical Systems"],"prefix":"10.1155","volume":"2018","author":[{"given":"Liang","family":"He","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9266-3044","authenticated-orcid":false,"given":"Linghe","family":"Kong","sequence":"additional","affiliation":[]},{"given":"Jun","family":"Tao","sequence":"additional","affiliation":[]},{"given":"Jingdong","family":"Xu","sequence":"additional","affiliation":[]},{"given":"Jianping","family":"Pan","sequence":"additional","affiliation":[]}],"member":"311","published-online":{"date-parts":[[2018,4,30]]},"reference":[{"doi-asserted-by":"publisher","key":"e_1_2_13_1_2","DOI":"10.1109\/TSG.2013.2295024"},{"doi-asserted-by":"publisher","key":"e_1_2_13_2_2","DOI":"10.1016\/j.comnet.2014.06.019"},{"doi-asserted-by":"crossref","unstructured":"LiG. 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