Method for transmitting/receiving data in wireless communication system and device supporting same

A user equipment for transmitting and receiving data in a wireless communication system, the user equipment comprising:

• a transceiver configured to transmit and receive radio signals externally;
• and
• a processor functionally connected to the transceiver,
• wherein the processor is configured to:
• receive, from a base station, a first message comprising first control information, wherein the first control information comprises a data bearer (DRB) identifier (ID) of a DRB configured for a transmission and reception of first data and second data identical with the first data among allocable DRBs;
• transmit, to the base station, the first data and the second data on different component carriers (CCs) associated with a logical path corresponding to the DRB ID;
• transmit a resource allocation request message to request a resource for transmitting the first data and the second data to the base station;
• and
• receive downlink control information for allocating resource from the base station,
• wherein the first data and the second data are transmitted through the allocated resource.