Charging for Mobile All-IP Telecommunications
Charging for Mobile All-IP Telecommunications
Modeling Credit Reservation Procedure for UMTS Online Charging System
IEEE Transactions on Wireless Communications
A secure mobile electronic payment architecture platform for wireless mobile networks
IEEE Transactions on Wireless Communications
Reducing Credit Re-authorization Cost in UMTS Online Charging System
IEEE Transactions on Wireless Communications
Wireless dynamic channel assignment performance under packet data traffic
IEEE Journal on Selected Areas in Communications
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Online Charging System (OCS) supports multiple prepaid and postpaid sessions simultaneously. Through credit reservation, the OCS assigns some credit units to a session. These credit units are decremented based on the traffic volume or the duration time. If the assigned credit units are consumed before the session is completed, an reserve units (RU) operation is executed to obtain more credit units from the OCS. If the credit at the OCS is depleted, the prepaid session is forced to terminate. During the RU operation, packet delivery is suspended until extra credit units are granted from the OCS. To avoid session suspension during credit reservation, we propose the credit pre-reservation mechanism (CPM) that reserves credit earlier before the credit at the GGSN is actually depleted. Analysis and simulation experiments are conducted to investigate the performance of the mechanism. Our study indicates that the CPM can significantly improve the performance of the OCS prepaid mechanism.