A policy controller of a mobile network receives an authorization request for a packet-based service from a node. In response to receiving the authorization request, the policy controller performs an authorization check to determine an authorization status of the service and sends an authorization response to the node. The authorization response indicates the authorization status of the service. In response to the same authorization request, the policy controller performs at least one further authorization check to redetermine the authorization status of the service. If the further authorization check indicates that the authorization status of the service has changed, the policy controller sends a status change message to the node. The status change message indicates to the node that the authorization status of the service has changed.