Patent ID: 7925262

Claim:
A mobile station for performing location registration to one of plural exchanges managing a location registration area where the mobile station is located, in a mobile communication system in which a radio network controller is connected to the plural exchanges, the mobile station comprising: a determiner configured to determine whether an identifier of an exchange notified by an access restriction signal from the radio network controller matches an identifier of the one of the plural exchanges which has performed the location registration of the mobile station, the access restriction signal is broadcast from the radio network controller when a failure or congestion occurs in one of the plural exchanges, and the access restriction signal includes the identifier to identify the exchange in which the failure or congestion occurred; and a communication controller configured to stop transmission of signals to the exchange which has performed the location registration of the mobile station when the identifier of the exchange notified by the access restriction signal from the radio network controller matches the identifier of the exchange which has performed the location registration of the mobile station and enable transmission of signals to the exchange which has performed the location registration of the mobile station when the identifier of the exchange notified by the access restriction signal from the radio network controller is different than the identifier of the exchange that has performed the location registration of the mobile station, wherein the access restriction signal includes a location or a bit number of the identifier of the specific exchange in which the failure or congestion occurred; the identifier of the one of the plural exchanges that has performed the location registration of the mobile station is included in a temporary identifier of the mobile station; and the communication controller determines if the exchange in which the failure or congestion occurred is the exchange of the one of the plural exchanges that has performed the location registration of the mobile station based on the location or the bit number included in the access restriction signal.