Abstract
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.
Highlights
Different types of wireless networks, such as cellular networks, worldwide interoperability for microwave access (WiMAX), and wireless local area networks (WLANs), have widely been deployed
Dual access calls accepted by a WLAN can make upward vertical handoffs which rates can be obtained through the multiplication of the transition probability from the double coverage to the cellular only area,Pw→c, and the accepted rates by a WLAN
Simulation results we present analytical and simulation results of the proposed scheme compared with the WLAN-first scheme [7] that has guard bands for horizontal handoff and vertical handoff calls
Summary
Different types of wireless networks, such as cellular networks, worldwide interoperability for microwave access (WiMAX), and wireless local area networks (WLANs), have widely been deployed. The residence time in the double coverage area of dual access calls admitted to the WLAN has the same distribution as Tdca. The residence time in the cell of dual access calls admitted to the cellular network in the double coverage area, Twcac,dca, can be expressed as. Coa are the number of entrances of the double coverage area and the cellular only area until the MS moves out to neighbor cells or the calls are successfully accepted to WLAN through vertical handoff. The cellular channel holding times of dual access calls accepted by the cellular networks in the double coverage area and in the cellular-only area are obtained from min(Tv,Twcac,dca) and min(Tv,Twcac,coa), respectively. For a given PTOT, the downlink voice capacity can be determined
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