Configuration and/or activation method for duplication transmission, method for duplication transmission and apparatuses thereof

An apparatus for duplication transmission, comprising:

• a first receiver configured to receive from a network device a first configuration message for configuring a user equipment (UE) to perform operations of carrier aggregation and at least two connectivities;
• and
• a second receiver configured to receive a second configuration message for duplication transmission of at least three RLC entities, and/or activation/deactivation signaling for duplication transmission of at least three RLC entities, from the network device,
• wherein the second configuration message comprises information on an RLC entity used by at least one data radio bearer (DRB) in performing duplication transmission, and
• wherein the activation/deactivation signaling received by the second receiver comprises indication on use statuses of RLC entities of at least one DRB configured with duplication transmission by a MAC CE, and the use statuses of RLC entities are ordered in an ascending order of indices of the RLC entities, wherein, when the use status is 1, the RLC entity is used for duplication transmission, and when the use status is 0, the RLC entity is not used for duplication transmission.