AN ACCESS CONTROL METHOD FOR A MOBILE COMMUNICATIONS SYSTEM

摘要

An access point (GGSN) from a mobile communications system to an external system is selected (3) at a serving node (SGSN) of the mobile communications system based on at least two or three grounds o f selection: the subscription data of a mobile subscriber stored in the mobile communication system or an access point selection data given by a user in a service request (1), or on other grounds. The serving node sends to the access point (GGSN) selected a further service request (4) which includes indication of the grounds of the selection, i.e. whether the access point is selected by subscription, by a user, or based on any other grounds. Thereby the access point is able to distinguish and accept service requests in which the rights of the user are already assured by the subscription, without any security problems. When the request is based on the selection of the access point by the user, or on any other insecure grounds, the access point is able to make any further actions to ensure the security. These further actio ns may include rejection of the service request.