Patent ID: 8675609

Claim:
A mobile communication method for switching a mobile station from a state of performing voice communications using a voice communication packet bearer via a radio access network in a first communication scheme which does not support a circuit-switched communication and a mobile transmission network accommodating the radio access network in the first communication scheme to a state of performing voice communications using a circuit-switched bearer via a radio access network in a second communication scheme which supports the circuit-switched communication and a core network accommodating the radio access network in the second communication scheme, the mobile communication method comprising the steps of: causing the mobile station to switch a radio access network in a connection destination from the radio access network in the first communication scheme to the radio access network in the second communication scheme; causing a mobility management node in the mobile transmission network to store predetermined information indicating that switching of the radio access network in the connection destination in the mobile station has been performed; causing the mobility management node to receive a delete bearer request signal to the voice communication packet bearer from a serving gateway apparatus in the mobile transmission network; and causing the mobility management node to transmit to the serving gateway apparatus a delete bearer response signal to the delete bearer request signal, without giving an instruction to the mobile station or the radio access network in the first communication scheme to release the voice communication packet bearer, if the mobility management node stores the predetermined information.