MOBILE COMMUNICATION TERMINAL APPARATUS, METHOD FOR CONTROLLING MOBILE COMMUNICATION TERMINAL APPARATUS, AND COMMUNICATION SYSTEM

摘要

An ETWSP receiving unit receives a primary message by use of an LTE network. An ETWSS receiving unit receives a secondary message by use of the LTE network. A 3G processing unit communicates by use of a 3G network. A CSFB control unit receives an instruction to switch to communication using the 3G network if connecting to the LTE network, switches connections from the LTE network to the 3G network if not having received the primary message, and holds the switching of the connection from the LTE network to the 3G network if having received the primary message and not having received the secondary message.