Mobile communication system

1. A mobile communication system, comprising:

a mobile station;

a base station wirelessly communicating with the mobile station; and

a gateway apparatus connected to the base station and a core network, wherein the base station comprises:

first transmission unit for transmitting a registration message for registering the mobile station in the gateway apparatus; and

second transmission unit for transmitting a direct transfer message including information pertaining to establishment of an emergency call,

the gateway apparatus comprises:

first reception unit for receiving the registration message from the base station;

second reception unit for receiving the direct transfer message from the base station; and

check unit for checking a consistency of information pertaining to the emergency call between the registration message and the direct transfer message,

wherein a procedure for the emergency call is performed based on a result of the checking the consistency of information.

2. The mobile communication system according to claim 1 , wherein the check by the check unit is performed in a case where a Registration Cause included in the registration message indicates an Emergency Call.

3. A gateway apparatus connecting a base station to a core network, comprising:

first reception unit receiving a registration message for registering a mobile station in the gateway apparatus from the base station;

second reception unit receiving a direct transfer message including information pertaining to an emergency call from the base station; and

check unit for checking a consistency of information pertaining to the emergency call between the registration message and the direct transfer message,

wherein a procedure for the emergency call is performed based on a result of the checking the consistency of information.

4. The gateway apparatus according to claim 3 ,

wherein the check by the check unit is performed in a case where a Registration Cause included in the registration message indicates an Emergency Call.

5. A communication method by a mobile communication system comprising:

a mobile station;

a base station wirelessly communicating with the mobile station; and

a gateway apparatus connected to the base station and a core network,

wherein the base station transmits a registration message for registering the mobile station in the gateway apparatus,

the base station transmits a direct transfer message including information pertaining to establishment of an emergency call,

the gateway apparatus receives the registration message from the base station,

the gateway apparatus receives the direct transfer message from the base station; and

the gateway apparatus performs a check of consistency of information pertaining to the emergency call between the registration message and the direct transfer message, and

wherein a procedure for the emergency call is performed based on a result of the performed check of the consistency of information.

6. The communication method according to claim 5 , wherein the check is performed in a case where a Registration Cause included in the registration message indicates an Emergency Call.

7. A communication method by a gateway apparatus connecting a base station to a core network, including:

receiving a registration message for registering a mobile station in the gateway apparatus from the base station;

receiving a direct transfer message including information pertaining to establishment of an emergency call from the base station; and

performing a check of consistency of information pertaining to the emergency call between the registration message and the direct transfer message,

wherein a procedure for the emergency call is performed based on a result of the performed check of the consistency of information.

8. The communication method according to claim 7 , wherein the check is performed in a case where a Registration Cause included in the registration message indicates an Emergency Call.

9. A mobile station in a mobile communication system comprising a gateway apparatus and a base station which is connected to the gateway apparatus, the mobile system comprising:

means for establishing a communication connection with the base station; and

means for communicating with the base station, which transmits a registration message for registering the mobile station in the gateway apparatus and transmits a direct transfer message including information pertaining to establishment of an emergency call to the gateway apparatus, via the communication connection,

wherein a consistency of information pertaining to the emergency call between the registration message and the direct transfer message is checked by the gateway apparatus, and

wherein a procedure for the emergency call is performed based on a result of the checking the consistency of information.

10. The mobile communication system according to claim 1 , wherein a procedure for the emergency call is performed based on a result of the checking the consistency of information.

11. The gateway apparatus according to claim 3 , wherein a procedure for the emergency call is performed based on a result of the checking the consistency of information.

12. The communication method according to claim 5 , wherein a procedure for the emergency call is performed based on a result of the performed check of consistency of information.

13. The communication method according to claim 7 , wherein a procedure for the emergency call is performed based on a result of the performed check of consistency of information.

14. The mobile station according to claim 9 , wherein a procedure for the emergency call is performed based on a result of the check of the consistency of information.

15. A gateway apparatus for facilitating communication between a base station and a network, comprising:

a first transceiver which receives, from the base station, a registration message for registering a mobile station in the gateway apparatus;

a second transceiver which receives, from the base station, a direct transfer message which includes information relating to an emergency call; and

a controller which performs at least one check relating to the registration message and the direct transfer message, the at least one check including a check relating to a consistency of information between the registration message and the direct transfer message, and a procedure for the emergency call is performed based on a result of the performed check of the consistency of information.

16. The gateway apparatus according to claim 15 , wherein the at least one check includes a check of whether the information relating to the emergency call includes service type information which relates to an emergency call establishment.

17. The gateway apparatus according to claim 15 , wherein the at least one check includes a check of whether the information relating to the emergency call includes a telephone number which is an emergency telephone number.

18. The gateway apparatus according to claim 15 , wherein the at least one check includes a check of whether the information relating to the emergency call includes information which indicates that the mobile station has performed an emergency setup procedure.

19. The gateway apparatus of claim 15 , wherein the controller performs a call releasing process based on a result of the check by the check unit.

20. The gateway apparatus of claim 15 , wherein the controller is configured to determine whether the emergency call is an emergency call that is originated by an authorized mobile station based on a result of the performed check.