Mobile network system and guidance message providing method

A mobile network system comprising:

• a guidance message control server;
• a call control server;
• and
• a plurality of access gateways each of which is connected to a mobile terminal via a wireless base station,
• wherein the call control server includes:
• a gateway management section that determines at least one of the plurality of access gateways as a subject of call restriction,
• a first instructing section that transmits a message transmission instruction including message specifying information and group specifying information to the guidance message control server in a case where the gateway management section determines an access gateway to be call-restricted, and
• a second instructing section that transmits a call restriction instruction including the group specifying information to the access gateway to be call-restricted determined by the gateway management section,
• wherein the guidance message control server includes:
• a receiving section that receives the message transmission instruction from the call control server,
• an acquisition section that acquires guidance message data specified by the message specifying information included in the message transmission instruction received by the receiving section, and
• a transmission section that transmits using a multicast transmission the guidance message data acquired by the acquisition section to a multicast group specified by the group specifying information included in the message transmission instruction received by the receiving section, and
• wherein each of the plurality of access gateways includes:
• a processing section that, in a case where the processing section receives the call restriction instruction from the call control server, performs multicast group participation processing for participating in the multicast group specified by the group specifying information included in the call restriction instruction, and
• a guidance transmission section that transmits the guidance message data that is received as a result of the multicast group participation processing performed by the processing section to the mobile terminal requesting the guidance transmission section to perform call connection via the wireless base station.