MOBILE COMMUNICATION METHOD, CIRCUIT EXCHANGE, AND MOBILE STATION

摘要

PROBLEM TO BE SOLVED: To establish a second RAN bearer after execution of a switching procedure even in the case where a first RAN bearer that does not support circuit switching cannot be switched to the second RAN bearer that supports circuit switching on the basis of a bearer switching procedure for AV communication or multi-calling.SOLUTION: A mobile communication method is used for AV communication performed by a mobile station and switches from a first bearer of a first RAN that does not support circuit switching to a second bearer of a second RAN that supports circuit switching. The mobile communication method includes: a step of accepting, by a node in a CN accommodating the second RAN, a switching instruction by a switching procedure from an MME in a mobile transmission network accommodating the first RAN; and a bearer establishing step of executing a bearer establishing procedure for AV communication in the second RAN if the second bearer after the switching is not a bearer for AV communication when the node detects the completion of the switching based on the instruction.