| 摘要 |
A communication system for supporting a communication session of a terminal, the communication system comprising: at least one charging unit arranged to monitor the communication session and generate a plurality of charging messages together indicating a total charge for the communication session; a primary charging data collection unit, a secondary charging data collection unit and a backup charging data collection unit, each charging collection unit being capable of receiving and correlating charging messages for the communication session; wherein: the or each charging unit is arranged to transmit the charging messages to the primary charging data collection unit or, if the charging unit determines that a charging message for the communication session has not been correctly received by the primary charging data collection unit, to die secondary charging data collection unit; and the primary and secondary charging data collection units are arranged to, if they have received only some of the charging messages for the communication session, transmit the content of the charging messages that they have received for the session to the backup charging data collection unit. |
