Gateway device, radio communication device, charging control method, data transmission method, and non-transitory computer readable medium

A method for a communication terminal, the method comprising:

• connecting to a first base station using a first radio access technology (RAT);
• and
• connecting to a second base station, which is added for dual connectivity in an addition procedure initiated by the first base station, using a second RAT that is different from the first RAT,
• wherein before the communication terminal connects to the first base station and the second base station for dual connectivity, the first base station sends, to a mobility management node that performs mobility management of the communication terminal, an indication message including a type of the second RAT and an identifier that identifies a flow between the communication terminal and a user plane node that forwards a user packet related to the communication terminal.

A communication terminal comprising:

• at least one memory;
• and
• at least one processor coupled to the at least one memory and configured to:
• connect to a first base station using a first radio access technology (RAT);
• and
• connect to a second base station, which is added for dual connectivity in an addition procedure initiated by the first base station, using a second RAT that is different from the first RAT,
• wherein before the communication terminal connects to the first base station and the second base station for dual connectivity, the first base station sends, to a mobility management node that performs mobility management of the communication terminal, an indication message including a type of the second RAT and an identifier that identifies a flow between the communication terminal and a user plane node that forwards a user packet related to the communication terminal.