CPC H04W 28/06 (2013.01) [H04L 47/34 (2013.01); H04L 69/04 (2013.01); H04L 69/22 (2013.01); H04W 72/1268 (2013.01); H04W 80/08 (2013.01); H04W 72/23 (2023.01)] | 16 Claims |
1. A method performed by a terminal in a wireless communication system, the method comprising:
receiving, from a base station, a message including a packet data convergence protocol (PDCP) re-establishment request for an acknowledged mode (AM) data radio bearer (DRB);
identifying whether information is configured based on the message, the information indicating whether a PDCP entity for the AM DRB continues or resets a header compression protocol;
in case that the information is not configured, performing header decompression for PDCP packets stored in a reception buffer;
after the header decompression for the stored PDCP packets is performed, resetting the header compression protocol; and
delivering, to an upper layer of the PDCP entity, at least one PDCP packet among the stored PDCP packets for which the header decompression is performed and not delivered to the upper layer in case that a first PDCP packet is delivered from a lower layer of the PDCP entity,
wherein the first PDCP packet has an earliest count value among count values for the stored PDCP packets.
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