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Browsing by Author "Son, Sok-Ian"

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    Modeling credit reservation procedure for UMTS online charging system
    (2007-11-01)
    Son, Sok-Ian
    ;
    Hung, Hui-Nien
    ;
    Lin, Yi-Bing
    ;
    Peng, Nan-Fu
    ;
    Jeng, Jeu-Yih
    The IP Multimedia Core Network Subsystem (IMS) provides real-time multimedia services for Universal Mobile Telecommunications System (UMTS). Through Recharge Threshold-based Credit Reservation (RTCR) mechanism, prepaid IMS services can be supported by the Online Charging System (OCS) in UMTS. In RTCR, when the remaining amount of prepaid credit is below a threshold, the OCS reminds the user to recharge the prepaid account. It is essential to choose an appropriate recharge threshold to reduce the probability that the in-progress service sessions are forced-terminated. An analytic model is developed to investigate the performance of RTCR for the OCS. Based on our study, the network operator can select the appropriate parameter values for various traffic conditions.