Method and apparatus for handling a protocol supporting suspension and resumption of secondary cell group (scg) in dual connectivity technology supported by next-generation mobile communication system

A method performed by a first base station associated with a master cell group (MCG) in a wireless communication system, the method comprising:

• transmitting, to a second base station associated with a secondary cell group (SCG), a first request message for a deactivation of the SCG;
• as a response to the first request message, receiving, from the second base station, a first acknowledgement message including a first radio resource control (RRC) message generated by the second base station, the first RRC message including first information indicating the deactivation of the SCG;
• and
• transmitting, to a terminal, a second RRC message including the first RRC message generated by the second base station,
• wherein the SCG is deactivated based on the first information indicating the deactivation of the SCG included in the second RRC message.

A terminal in a wireless communication system, the terminal comprising:

• a transceiver;
• and
• a controller configured to:
• receive, from a first base station associated with a master cell group (MCG) via the transceiver, a first radio resource control (RRC) message including a second RRC message generated by a second base station associated with a secondary cell group (SCG),
• identify first information indicating a deactivation of the SCG included in the second RRC message, and
• determine to deactivate the SCG based on the first information indicating the deactivation of the SCG.

A first base station associated with a master cell group (MCG) in a wireless communication system, the first base station comprising:

• a transceiver;
• and
• a controller configured to:
• transmit, to a second base station associated with a secondary cell group (SCG) via the transceiver, a first request message for a deactivation of the SCG,
• as a response to the first request message, receive, from the second base station via the transceiver, a first acknowledgement message including a first radio resource control (RRC) message generated by the second base station, the first RRC message including first information indicating the deactivation of the SCG, and
• transmit, to a terminal via the transceiver, a second RRC message including the first RRC message generated by the second base station,
• wherein the SCG is deactivated based on the first information indicating the deactivation of the SCG included in the second RRC message.