Patent ID: 6643517
Filing Date: 2003-11-04
Classification: H04W

Abstract:
In a mobile communications system having base stations communicating with mobile radio units, a method of restricting the operation of a mobile radio unit when within a protected zone, the method comprising:providing at least one base station within or near the protected zone to broadcast information specifying the geographic location of the boundaries of the protected zone; said at least one base station having a coverage area overlapping the protected zone transmitting a warning signal within its coverage area; the mobile radio unit receiving the broadcast information from the at least one base station; determining the geographic location of the mobile radio unit receiving the broadcast information from the at least one base station; the mobile radio unit determining on the basis of the broadcast information and its geographic location whether the mobile radio unit is located within the protected zone only if the mobile radio unit has received the warning signal; and the mobile radio unit restricting operation of the mobile radio unit if it is within the protected zone.