Patent ID: 8442026

Claim:
A mobile communication method in which a mobile station location-registered on a mobile communication system of a first communication scheme starts a circuit-switched communication in a mobile communication system of a second communication scheme, comprising the steps of: transmitting, from a second protocol function for the first communication scheme to a first protocol function for the first communication scheme, a first service request to request to start the circuit-switched communication in the mobile communication system of the second communication scheme, and starting a predetermined timer, at the mobile station; transmitting, from the first protocol function for the first communication scheme to a radio access apparatus of the first communication scheme, the first service request, after establishing a first radio link between the first protocol function for the first communication scheme and the radio access apparatus of the first communication scheme, at the mobile station; and stopping, at the first protocol function for the first communication scheme, a predetermined timer, after detecting a radio link failure of the first radio link after receiving a switching command instructing performance of a switching process from the mobile communication system of the first communication scheme to the mobile communication system of the second communication scheme, at the mobile station.