1. A gateway apparatus that connects a base station and a core network apparatus,
comprising:
a first signal transceiver that communicates with said base station and receives, from said base station, a first message related to an emergency call;
a second signal transceiver that communicates with said core network apparatus and receives, from said core network apparatus, a second message related to the emergency call; and
a processor comprising a call control unit configured to check the first message related to the emergency call with the second message related to the emergency call;
wherein said first message is transmitted in order to register a mobile station in said gateway apparatus, and
wherein said first message is related to registration, and said second message is related to establishment.
2. The gateway apparatus according to claim 1, wherein
said first message is an UE REGISTER REQUEST message.
3. The gateway apparatus according to claim 1 or 2, wherein
said second message is a RAB ASSIGNMENT REQUEST message.
4. The gateway apparatus according to claim 1, wherein
said first message includes a Registration Cause parameter.
5. A communication method that is realized by a gateway apparatus that connects a
base station and a core network apparatus, the method comprising steps of:
communicating with said base station; communicating with said core network apparatus;
checking a first message related to an emergency call with a second message related to the emergency call, and

wherein said first message is a message that is transmitted to said gateway apparatus from said base station in order to register a mobile station in said gateway apparatus,
wherein said second message is a message that is transmitted to said gateway apparatus from said core network apparatus, and
wherein said first message is related to registration and said second message is related to establishment.
6. A mobile station in a communication system that includes a base station, a core
network apparatus and a gateway apparatus that connects said base station and said core
network apparatus, the mobile station comprising:
a communication unit that communicates with said base station,
wherein said base station communicates with said gateway apparatus that checks a first message related to an emergency call and a second message related to the emergency call,
wherein said first message is a message that is transmitted to said gateway apparatus from said base station in order to register said mobile station in said gateway apparatus,
wherein said second message is a message that is transmitted to said gateway apparatus from said core network apparatus, and
wherein said first message is related to registration and said second message is related to establishment.
7. The mobile station according to claim 6, wherein
said first message is an UE REGISTER REQUEST message.
8. The mobile station according to claim 6, wherein
said second message is a RAB ASSIGNMENT REQUEST message.
9. The mobile station according to claim 6, wherein
said first message includes a Registration Cause parameter.