Modeling prepaid application server of VoIP and messaging services for UMTS

Sok Ian Sou*, Yi-Bing Lin, Quincy Wu, Jeu Yih Jeng

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


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.

Original languageEnglish
Pages (from-to)1434-1441
Number of pages8
JournalIEEE Transactions on Vehicular Technology
Issue number3
StatePublished - 1 May 2007


  • Billing
  • Diameter protocol
  • IP multimedia core-network subsystem (IMS)
  • Session initiation protocol (SIP)
  • VoIP

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