Radio communication terminal device, network device, mobile communication system, and position registering method

A mobile communication system comprising a radio communication terminal apparatus, the apparatus comprising:

• a management section that stores and manages connected mode, in which a radio resource control connection is established, and idle mode, in which a radio resource control connection is not established;
• and
• a radio resource control processing section that, when a radio resource control connection is established when a state stored and managed in the management section is in idle mode, determines that the radio resource control connection is established to perform location registration, and transmits to a network apparatus a request for location registration, and a radio resource control release flag which allows the radio resource control connection to be released when the location registration is finished;
• and
• the network apparatus that, upon receiving the radio resource control release flag from the radio communication terminal apparatus, releases the radio resource control connection when the location registration is finished.

A mobile communication system comprising a radio communication terminal apparatus, the apparatus comprising:

• a management section that stores and manages connected mode, in which a radio resource control connection is established, and idle mode, in which a radio resource control connection is not established;
• and
• a radio resource control processing section that, when a radio resource control connection is established to perform location registration when a state stored and managed in the management section is in idle mode, determines that the radio resource control connection is established to perform location registration, sets information showing whether or not the radio resource control connection is allowed to be released when the location registration is finished, in an establishment cause included in a radio resource control connection request which requests the radio resource control connection, and transmits the radio resource control connection request to a network apparatus;
• and
• the network apparatus that, upon receiving the establishment cause from the radio communication terminal apparatus, releases the radio resource control connection when the location registration is finished.