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In this article, we propose a new CAC scheme that considers both the MSs with a single interface and with dual interfaces. By employing the concept of guard-bands, the proposed CAC scheme gives higher priority to MSs with a single interface than those with dual interfaces to accommodate more MSs. The call blocking and dropping probabilities are analyzed using Markov chains and how to determine appropriate guard bands for CAC is investigated through cost minimization problems. Analytical and simulation results demonstrate that the proposed scheme can achieve lower blocking probabilities compared with existing schemes that do not include single interface MSs.<\/jats:p>","DOI":"10.1186\/1687-1499-2011-91","type":"journal-article","created":{"date-parts":[[2011,9,6]],"date-time":"2011-09-06T19:01:11Z","timestamp":1315335671000},"update-policy":"http:\/\/dx.doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Call admission control with heterogeneous mobile stations in cellular\/WLAN interworking systems"],"prefix":"10.1186","volume":"2011","author":[{"given":"Hyung-Taig","family":"Lim","sequence":"first","affiliation":[]},{"given":"Younghyun","family":"Kim","sequence":"additional","affiliation":[]},{"given":"Sangheon","family":"Pack","sequence":"additional","affiliation":[]},{"given":"Chul-Hee","family":"Kang","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2011,9,6]]},"reference":[{"issue":"2","key":"93_CR1","doi-asserted-by":"publisher","first-page":"49","DOI":"10.1109\/MWC.2003.1182111","volume":"10","author":"E Gustafsson","year":"2003","unstructured":"Gustafsson E, Jonsson A: Always best connected. 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