Mobile communication system, position registration method, terminal, and home agent

A position registration method in a mobile communication system comprising at least a terminal receiving a plurality of types of services and a home agent receiving a position registration request from the terminal when the terminal moves, said position registration method comprising

• setting a plurality of home addresses of the home agent corresponding to the plurality of types of services and setting and holding one home address among the plurality of the set home addresses as a representative home address and the rest as subordinate home addresses,
• having the terminal create a representative care-of address corresponding to the representative home address to make a representative address set and sending a position registration request to the home agent with the representative address set, and
• having the home agent create subordinate care-of addresses making up subordinate address sets corresponding to the set subordinate home addresses based on the representative address set according to the position registration request and registering the position of the subordinate address sets simultaneously with the registration of the positions of the representative address set.

A non-transitory computer readable medium having a position registration program stored therein for carrying out position registration in a mobile communication system comprising at least a terminal receiving a plurality of types of services and a home agent receiving a position registration request from the terminal when the terminal moves, such position registration program making a computer execute:

• a step of setting a plurality of home addresses of the home agent corresponding to the plurality of types of services and setting and holding one of the set plurality of home addresses as a representative home address and the rest as subordinate home addresses,
• a step of having the terminal create a representative care-of address corresponding to the representative home address to make a representative address set and using this representative address set for sending a position registration request to the home agent, and
• a step of having the home agent create subordinate care-of addresses making up subordinate address sets paired with the set subordinate home address based on the representative address set relating to the position registration request and register the positions of the subordinate address sets simultaneously with the registration of position of the representative address set.