| 摘要 |
In a billing process used to bill the connections established by the user of a telecommunication network (2) identified by means of a SIM card (10), the duration and time of the connection are determined by a time measurement device (100) integrated into the SIM-card and synchronised with an external clock signal (f+, f-) from an external quartz oscillator; and the amount to be billed is evaluated on the basis of the thus determined duration and time of the connection and of at least one tariff table stored in the SIM-card (10). The tariff tables (1013) are stored in a tariff server (6) and can be downloaded into the SIM-card (10) over the telecommunication network (2). The time measurement device can be checked by a time server (5) in the infrastructure and adjusted, if required. The process can be used for both prepaid and postpaid cards. The advantages are that all data required to determined the amount to be billed are available on the SIM-card, and billing is directly done at the source, i.e. at the user. No other billing system is required in the infrastructure. |
