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Modeling Prepaid Application Server of VoIP and Messaging Services for UMTS

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4 Author(s)
Sok-Ian Sou ; Dept. of Comput. Sci. & Inf. Eng., Nat. Chiao Tung Univ., Hsinchu ; Yi-Bing Lin ; Quincy Wu ; Jeu-Yih Jeng

Universal mobile-telecommunication system supports IP multimedia services through the IP multimedia core-network subsystem (IMS). This paper proposes a prepaid application server (PAS) to handle both the prepaid calls and messaging services in the IMS. When both voice and messaging are simultaneously offered, a potential problem is that the delivery of a message during a call may result in force-termination of that call due to credit depletion. To address this issue, we describe a strategy to determine if a prepaid message can be sent out during a call session. We propose an analytic model to investigate the performance of this strategy. This paper provides guidelines to select appropriate input parameters for the PAS

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Vehicular Technology, IEEE Transactions on  (Volume:56 ,  Issue: 3 )