Method and device for supporting multiple scg configurations in dual connectivity supported by next-generation mobile communication system

A method performed by a first base station in a communication system, the method comprising:

• transmitting, to a terminal, configuration information for a secondary cell group (SCG) including at least one serving cell associated with a second base station;
• transmitting, to the terminal, a first message for activation or deactivation of the SCG;
• and
• in case that the SCG is deactivated based on the first message and uplink data arrives on at least one bearer of the SCG, receiving, from the terminal, a second message for activation of the SCG.

A terminal in a communication system, the terminal comprising:

• a transceiver;
• and
• a controller configured to:
• receive, from a first base station via the transceiver, configuration information for a secondary cell group (SCG) including at least one serving cell associated with a second base station,
• receive, from the first base station via the transceiver, a first message for activation or deactivation of the SCG, and
• in case that the SCG is deactivated based on the first message and uplink data arrives on at least one bearer of the SCG, transmit a second message for activation of the SCG via the transceiver.

A first base station in a communication system, the first base station comprising:

• a transceiver;
• and
• a controller configured to:
• transmit, to a terminal via the transceiver, configuration information for a secondary cell group (SCG) including at least one serving cell associated with a second base station,
• transmit, to the terminal via the transceiver, a first message for activation or deactivation of the SCG, and
• in case that the SCG is deactivated based on the first message and uplink data arrives on at least one bearer of the SCG, receive, from the terminal via the transceiver, a second message for activation of the SCG.