Some of the present implementations provide a method for PDCP PDU duplication for a UE. The method receives, from a base station, through RRC signaling, a PDCP duplication entity and several RLC entities, an RLC entity being a primary path, and one or more of the RLC entities as active RLC entities for transmitting duplicated PDCP PDUs. The method generates one or more duplicated PDCP PDUs when a PDCP duplication function activation indicator is received, transmits the generated one or more duplicated PDCP PDUs to the one or more active RLC entities, and receives a MAC CE comprising a plurality of fields for switching at least one of the one or more active RLC entities, excluding the RLC entity that is the primary path, to an inactive RLC entity.