A method of a base station for transmitting a signal to a user equipment using two or more bands set in different TDD, Time Division Duplex, configurations, the method comprising: transmitting, to a first user equipment (S630; S1430; S1530; S1730; S1830; S1930; S2010), supporting different TDD configurations of an inter-band carrier aggregation, an enquiry message for a user equipment capability, and transmitting, to a second user equipment that does not support an inter-band carrier agreement, an enquiry message for a user equipment capability; receiving (S550; S640; S1440; S1540; S1740; S1840; S1940; S2020) a user equipment capability information message including transmission mode information of the first user equipment, in response to the enquiry message transmitted to the first user equipment, wherein the transmission mode information of the first user equipment includes information indicating whether the first user equipment operates in a full-duplex mode or a half-duplex mode in two or more bands set in different TDD configurations of an inter-band carrier aggregation; in response to the enquiry message transmitted to the second user equipment, receiving, from the second user equipment that does not support an inter-band carrier agreement, a user equipment capability information message that does not include transmission mode information of the second user equipment in UE Capability Information Element, IE, of the second user equipment; determining the different TDD configurations of an inter-band carrier aggregation for the first user equipment according to a report of the transmission mode information of the first user equipment; transmitting (S560, S570), to the first user equipment, control information for configuring component carrier aggregation comprising component carriers using the two or more bands; and transmitting (S580; S2040; S2050) a signal to the first user equipment through the component carrier aggregation according to the transmission mode information, wherein the transmission mode information of the first user equipment is included in UE Capability IE of the first user equipment. transmitting, to a first user equipment (S630; S1430; S1530; S1730; S1830; S1930; S2010), supporting different TDD configurations of an inter-band carrier aggregation, an enquiry message for a user equipment capability, and transmitting, to a second user equipment that does not support an inter-band carrier agreement, an enquiry message for a user equipment capability; receiving (S550; S640; S1440; S1540; S1740; S1840; S1940; S2020) a user equipment capability information message including transmission mode information of the first user equipment, in response to the enquiry message transmitted to the first user equipment, wherein the transmission mode information of the first user equipment includes information indicating whether the first user equipment operates in a full-duplex mode or a half-duplex mode in two or more bands set in different TDD configurations of an inter-band carrier aggregation; in response to the enquiry message transmitted to the second user equipment, receiving, from the second user equipment that does not support an inter-band carrier agreement, a user equipment capability information message that does not include transmission mode information of the second user equipment in UE Capability Information Element, IE, of the second user equipment; determining the different TDD configurations of an inter-band carrier aggregation for the first user equipment according to a report of the transmission mode information of the first user equipment; transmitting (S560, S570), to the first user equipment, control information for configuring component carrier aggregation comprising component carriers using the two or more bands; and transmitting (S580; S2040; S2050) a signal to the first user equipment through the component carrier aggregation according to the transmission mode information, wherein the transmission mode information of the first user equipment is included in UE Capability IE of the first user equipment.