Radio terminal and network apparatus

A radio terminal configured to perform a relay between another radio terminal and a network, the radio terminal comprising:

• a transmitter configured to notify the network of first information indicating that the radio terminal is a relay terminal of the another radio terminal;
• a controller configured to forward data addressed to the another radio terminal to the another radio terminal via a connection between the another radio terminal through the radio terminal and the network;
• and
• a receiver configured to receive, from the network, a message indicating that the data addressed to the another radio terminal exists when at least part of the connection is released;
• wherein
• the controller is configured to start control for establishing the connection in order to forward the data addressed to the another radio terminal in response to receiving the message, and
• the transmitter is configured to transmit, to the another radio terminal, a notification for updating a location of the another radio terminal registered in the network according to a change in a location of the radio terminal.

A network apparatus comprising:

• a controller,
• wherein the controller is configured to
• receive first information indicating that a first radio terminal is a relay terminal of a second radio terminal,
• transmit data addressed to the second radio terminal to the second radio terminal via a connection between the second radio terminal through the first radio terminal and the network apparatus, and
• notify the first radio terminal of a message indicating that the data addressed to the second radio terminal exists based on the first information when at least part of the connection is released, wherein
• the controller is configured to update a location of the another radio terminal registered in the network, instead of the another radio terminal updating the location, according to a change in a location of the radio terminal.