| CPC H04W 76/19 (2018.02) [H04W 76/11 (2018.02); H04W 92/18 (2013.01)] | 10 Claims |

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1. A method for operating a user equipment (UE) in a wireless communication system, the method comprising:
performing communication through a link established between the UE and a second UE;
transmitting a first message for requesting an update for an identifier of the link;
receiving a second message in response to the first message; and
reestablishing a packet data convergence protocol (PDCP) entity of the UE based on the update of the identifier,
wherein the first message includes information related to a starting time to apply the updated identifier, and
wherein the second message includes information related to whether to accept the starting time to apply the updated identifier.
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