| 摘要 |
A system for deactivating an established communication channel (e.g. Radio Access Bearer) between a user station and an access point, which provides a service to the user station. The system transfers user data (e.g. subscriber profile) stored in a database entity (e.g. HLR) to a serving controller (e.g. SGSN) connected between the user station and the access point (e.g. GGSN) and defines at the serving controller that that user is not permitted to access that service (i.e. must be barred for that service), allowing for deactivation of the established communication channel based on the transferred user data. Conventional techniques, however, allow barring a certain service (through a PDP context activation) only at the activation phase (i.e. when the PDP context does not exist), but the invention allows to bar a service even after an activation of a PDP context (e.g. when a user roams between his/her home and visiting network).
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