MOBILE COMMUNICATION METHOD, MOBILE COMMUNICATION SYSTEM, DELIVERY SERVER, SUBSCRIBER INFORMATION MANAGEMENT SERVER, AND SESSION MANAGEMENT SERVER

摘要

A radio base station includes a mobile communication method for delivering an incoming signal for voice communication to a mobile station on standby in any of a plurality of classifications of radio access networks. The method includes, when a session management server managing a mobile station and the classification of the radio access network detects a change to the classification of the radio access network of the standby target of the mobile station, a subscriber information management server managing the subscriber information of each mobile station is notified. The subscriber information management server notifies the delivery server of the classification of the radio access network of the standby target. The delivery server manages the classification of the radio access network of the standby target of the mobile station as notified by the subscriber information management server. The delivery server delivers the incoming signal for voice communication.