The present application provides a method executed by user equipment (UE), comprising: receiving radio resource control (RRC) signaling, the RRC signaling comprising configuration information used for configuring, for the UE, a data radio bearer (DRB) supporting packet duplication; establishing a corresponding DRB according to the configuration information; and calculating transmittable data of a packet data convergence protocol (PDCP) entity for a logical channel corresponding to the established DRB. The present application also provides corresponding UE, a base station, and a corresponding method executed by a base station.