Method and apparatus for wireless communication in wireless communication system

A method performed by a receiving apparatus in a wireless communication system, the method comprising:

• based on receiving first data, from a lower layer by a packet data convergence protocol (PDCP) entity, removing, by the PDCP entity, a PDCP header from the first data;
• performing, by the PDCP entity, deciphering on a portion of the first data except a service data adaptation protocol (SDAP) header, the portion including an uplink data compression (UDC) header and a UDC data block;
• performing, by the PDCP entity, integrity verification on the deciphered UDC header, the deciphered UDC data block, and the SDAP header;
• performing, by the PDCP entity, decompression on the UDC data block based on the UDC header;
• and
• transmitting, to an upper layer by the PDCP entity, the decompressed UDC data and the SDAP header.

A transmitting apparatus in a wireless communication system, the transmitting apparatus comprising:

• a transceiver;
• and
• at least one controller implementing a service data adaptation protocol (SDAP) entity, a packet data convergence protocol (PDCP) entity, and a lower layer,
• wherein the at least one controller is configured to:
• based on receiving first data including an upper layer header, generate, by the SDAP entity, second data;
• by adding an SDAP header to the first data,
• transmit, by the SDAP entity, the second data to the PDCP entity,
• generate, by the PDCP entity, an uplink data compression (UDC) data block by performing data compression on the second data except the SDAP header,
• generate, by the PDCP entity, an UDC header,
• add, by the PDCP entity, the UDC header to the SDAP header,
• perform, by the PDCP entity, integrity protection on the UDC header, the SDAP header, and the UDC data block,
• perform, by the PDCP entity, ciphering on the integrity protected UDC header and the integrity protected UDC data block except the integrity protected SDAP header,
• generate, by the PDCP entity, third data by adding a PDCP header to the integrity protected SDAP header, the ciphered UDC data header, and the ciphered UDC data block, and
• transmit, to the lower layer by the PDCP entity, the third data.

A receiving apparatus in a wireless communication system, the receiving apparatus comprising:

• a transceiver;
• and
• at least one controller implementing a packet data convergence protocol (PDCP) entity, a lower layer, and an upper layer,
• wherein the at least one controller is configured to:
• based on receiving first data, from the lower layer by the PDCP entity, remove, by the PDCP entity, a PDCP header from the first data,
• perform, by the PDCP entity, deciphering on a portion of the first data except a service data adaptation protocol (SDAP) header, the portion including an uplink data compression (UDC) header and a UDC data block,
• perform, by the PDCP entity, integrity verification on the deciphered UDC header, the deciphered UDC data block, and the SDAP header,
• perform, by the PDCP entity, decompression on the UDC data block based on the UDC header, and
• transmit, to the upper layer by the PDCP entity, the decompressed UDC data and the SDAP header.