Call admission control with heterogeneous mobile stations in cellular/WLAN interworking systems

Abstract

Although different call admission control (CAC) schemes have been proposed for cellular-wireless local area network (WLAN) interworking 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 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.

CSV: Content Service Offloading System with Vehicular Caching

“…For the tactical analysis, we assume that the contact time between VC and the user (e.g., from to and from to in Figure 1 ) denoted by follows an exponential distribution with mean 1/ as it is widely utilized for VC residence time [ 20 ]. In addition, it is assumed that the period when VC is not available (i.e., non-contact time) represented by follows an exponential distribution with mean 1/ as it is usually assumed for the period in a FN (BS)-only area [ 21 , 22 ]. From the start, the session continues during the session duration represented by (i.e., and in Figure 1 ) which follows an exponential distribution with mean 1/ [ 23 ].…”