Performance analysis of credit re-authorization schemes in UMTS online charging system
IWCMC '07 Proceedings of the 2007 international conference on Wireless communications and mobile computing
IEEE Transactions on Wireless Communications
Design and implementation of policy and charging control system for advanced mobile services
ICICS'09 Proceedings of the 7th international conference on Information, communications and signal processing
Credit pre-reservation mechanism for UMTS prepaid service
IEEE Transactions on Wireless Communications
SPR proxy mechanism for 3GPP Policy and Charging Control System
Computer Networks: The International Journal of Computer and Telecommunications Networking
Improving session continuity through user mobility tracking for EPS inter-serving gateway handover
Wireless Communications & Mobile Computing
Capillary machine-to-machine communications: the road ahead
ADHOC-NOW'12 Proceedings of the 11th international conference on Ad-hoc, Mobile, and Wireless Networks
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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.