Method for performing management of different ids in a relay ue in wireless communication system and a device therefor

A User Equipment (UE) for operating in a wireless communication system, the UE comprising:

• a Radio Frequency (RF) module;
• and
• a processor operably coupled with the RF module and configured to:
• receive information for mapping table between a set of first identifiers (IDs) and a set of second IDs from a network,
• wherein the set of first IDs includes first IDs which are used between the UE and a remote UE, which is configured to connect to the UE, to identify the remote UE, and the set of second IDs includes second IDs are used between the relay UE and the network to identify the remote UE,
• receive a UL packet, which is to be forwarded to the network, without a second ID from the remote UE identified by a first ID associated with the second ID according to the mapping table,
• add the second ID associated with the first ID to the UL packet, and
• transmit the UL packet with second ID to the network.