| 摘要 |
Transaction detail records for a mobile data service, which involves a communications path carrying at least one signalling channel and a plurality of data channels, and also involves a resource 22 for providing at least one of authentication, authorisation and accounting, are assembled by; ```demultiplexing signalling sessions carried on the signalling channel, and selecting a signalling session related to a mobile data service, ```using information from the selected signalling session to identify data sessions associated with the mobile data service, ```using information from the selected signalling session to obtain information related to the mobile data service from the resource 22 and, ```assembling information relating to the identified data sessions and information obtained from the resource to provide a transaction detail record. |
