| 摘要 |
A system for changing the service profile of a mobile subscriber includes a location part (31), a evaluation part (32) and a subscriber connection exchange part (33). Besides these, the home location register contains such individual subscriber connections for the subscriber, which have a different service profile. The duty of the location part is to find out the location of the mobile station in the network and to give location information to the evaluation part. The information may be e.g. a location area identity, cell identity or switching centre area identity which is used in the public land mobile network. The evaluation part checks to find out whether the location information has changed compared with the location information received earlier. If it has, it searches the memory for the corresponding location information and compares the connection information in the record with the current connection information. If the connection information is identical, the process remains waiting for new location information. If the connection information is different, the evaluation logic deduces that the connection must be exchanged for a new one and a connection exchange operation must be started. This may take place so that the connection exchange part disconnects the mobile station from the network and reconnects to the network using a new MSISDN number. The algorithms and encryption keys relating to this number it fetches from the memory. The network fetches from the home location register the subscriber information relating to this MSISDN number and along with this also the service profile relating to this number. It is most advantageous to implement the location part, the evaluation part and the subscriber connection exchange part on the subscriber identity module (SIM).
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