A configuration and/or activation method for duplication transmission, method for duplication transmission and apparatuses thereof. A UE configured with operations of carrier aggregation and/or at least two pieces of connectivity is configured with a message for duplication transmission and/or activation/deactivation signaling for duplication transmission, hence, duplication transmission having three or more transmission legs may be supported. Certain embodiments provide a UE configured as multi-connectivity or carrier aggregation of multi-leg, a leg of relatively good quality may be used for duplication transmission of data, which may provide gains of the duplication transmission to reliability of data transmission.