| CPC H04W 28/065 (2013.01) [H04L 1/00 (2013.01); H04L 69/04 (2013.01); H04W 28/0278 (2013.01); H04W 28/04 (2013.01); H04W 72/21 (2023.01); H04W 74/0833 (2013.01)] | 20 Claims |

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1. A method performed by a terminal in a wireless communication system, the method comprising:
receiving, from a base station, packet data convergence protocol (PDCP) configuration information that configures a PDCP entity of the terminal to use an uplink data compression (UDC);
generating, by the PDCP entity, a UDC header and a UDC data block, based on the PDCP configuration information;
ciphering, by the PDCP entity, the UDC header and the UDC data block;
generating, by the PDCP entity, a PDCP data comprising a PDCP header, the ciphered UDC header, and the ciphered UDC data block; and
transmitting the generated PDCP data to the base station,
wherein a header compression is not configured in case that the UDC is configured.
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