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Although different Call Admission Control (CAC) schemes have been proposed for cellular-wireless local area network (WLAN) inter-working systems, no studies consider Mobile Stations (MSs) only with a single interface (for either WLANs or cellular networks) and thus, these MSs will experience higher call blocking and dropping probabilities. In this paper, the authors 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.
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