Method and apparatus for transmitting/receiving wireless signal in wireless communication system

A device comprising:

• a memory configured to store instructions;
• and
• a processor configured to perform operations by executing the instructions,
• wherein the operations performed by the processor comprise:
• receiving a first message including configuration information regarding a multi-path (MP) bearer configured with a plurality of radio link control (RLC) entities including at least one first RLC entity related to a direct path to a network and at least one second RLC entity related to an indirect path to the network;
• receiving a second message including information regarding activation/deactivation of each RLC entity;
• and
• transmitting a data unit based on the MP bearer configured through the configuration information,
• wherein the configuration information includes information regarding data duplication for the data unit transmission,
• wherein the information regarding activation/deactivation of each RLC entity is configured based on RLC entity indexes for the plurality of RLC entities,
• wherein the RLC entity indexes are determined based on an indexing order in which at least one first RLC entity index of the at least one first RLC entity related to the direct path is followed by at least one second RLC entity index of the at least one second RLC entity related to the indirect path, and
• wherein the data unit transmission is duplicated based on the data duplication on activated RLC entities among the plurality of RLC entities.