The disclosure relates to a communication method and
system for converging a 5th-Generation (5G) communication
system for supporting higher data rates beyond a 4th-Generation (4G)
system with a technology for
Internet of Things (IoT). The disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building,
smart city,
smart car, connected car, health care,
digital education, smart retail, security and safety services. A method performed by a terminal in a communication system is provided. The method includes receiving, from a first
base station, configuration information for a secondary
cell group (SCG) including at least one serving
cell associated with a second
base station, receiving, from the first
base station, 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, transmitting a second message for activation of the SCG. According to the disclosure, carrier aggregation and dual
connectivity can be quickly activated, thereby reducing battery consumption of a terminal.