Patent ID: 8868073

Claim:
A mobile communication method with which a mobile station performs a standby operation in a mobile communication system equipped with a first radio access network which can provide circuit switch communication, and a second radio access network which cannot provide the circuit switch communication, but can provide the packet switch communication having a higher speed than the first radio access network, the method comprising: a step in which the mobile station transmits a location registration request signal including the capability information of the mobile station to a mobile switching center of the first radio access network; a step in which the mobile switching center of the first radio access network acquires a subscriber information transmission signal of the mobile station from a subscriber management server device in response to the received location registration request signal; a step in which the mobile switching center of the first radio access network determines either the first radio access network or the second radio access network as a standby radio access network of the mobile station based on the capability information of the mobile station included in the received location registration request signal from the mobile station and the information contained in the received subscriber information transmission signal from the subscriber management server device; a step in which the mobile switching center of the first radio access network transmits a signal including specific information of the determined standby radio access network of the mobile station to a radio access network device of the first radio access network; and a step in which the mobile station performs a standby operation in the standby radio access network of the mobile station determined by the mobile switching center of the first radio access network.