Method, information processing apparatus, and system

An information processing apparatus comprising:

• a processor;
• and
• a storage unit storing an instruction, wherein
• by executing the instruction stored in the storage unit, the processor is configured to:
• acquire a position registration request from a user terminal;
• judge whether a first identification number of a first communication carrier included in the position registration request is different from a second identification number of a second communication carrier associated with the user terminal, which is registered with a subscriber database;
• and
• instruct a mobility management node to set a first network of the first communication carrier when the first identification number of the first communication carrier is different from the second identification number of the second communication carrier registered with the subscriber database,
• receive, after setting of the first network is completed, a notification of completion of data channel setting for the first network from the mobility management node;
• and
• transmit, in response to receiving the data channel setting completion notification from the mobility management node, a position registration completion notification and a parameter of switching from a second network to the first network, to the user terminal;
• wherein
• the first network and the second network corresponding to the second identification number of the second communication carrier registered with the subscriber database comply with different communication standards.

A system comprising:

• a first information processing apparatus comprising a first processor and a first storage unit storing a first instruction;
• and
• a second information processing apparatus comprising a second processor and a second storage unit storing a second instruction, wherein
• by executing the first instruction stored in the first storage unit, the first processor is configured to:
• acquire a position registration request from a user terminal;
• judge whether a second identification number of a first communication carrier included in the position registration request is different from a first identification number of a second communication carrier associated with the user terminal, which is registered with a subscriber database;
• instruct a mobility management node to set a first network of the first communication carrier when the first identification number of the first communication carrier is different from the second identification number of the second communication carrier registered with the subscriber database;
• receive, after setting of the first network is completed, a notification of completion of data channel setting for the first network from the mobility management node;
• and
• transmit, in response to receiving the data channel setting completion notification from the mobility management node, a position registration completion notification and a parameter of switching from a second network to the first network, to the user terminal;
• and
• by executing the second instruction stored in the second storage unit, the second processor is configured to:
• when signal strength from a base station of the first network of the first communication carrier is equal to or larger than a predetermined value or larger than signal strength from a base station of a second network of the second communication carrier registered with the subscriber database, transmit the position registration request to the first information processing apparatus, and
• the first network and the second network comply with different communication standards.