Method and apparatus for wireless communication in wireless communication system

1. A method performed by a transmitting apparatus in a wireless communication system, the method comprising:

based on receiving first data including an upper layer header, generating, by a service data adaptation protocol (SDAP) entity, second data by adding an SDAP header to the first data;

transmitting, to a packet data convergence protocol (PDCP) entity by the SDAP entity, the second data;

generating third data by performing, by the PDCP entity, header compression on the upper layer header included in the second data, wherein the header compression is not applicable to the SDAP header;

generating fourth data with message authentication code for integrity (MAC-I) by performing, by the PDCP entity, integrity protection on the third data including the SDAP header and the header compressed upper layer header;

generating fifth data by performing, by the PDCP entity, ciphering on the fourth data except the SDAP header;

generating, by the PDCP entity, sixth data by adding a PDCP header to the fifth data; and

transmitting, to a lower layer by the PDCP entity, the sixth data.

2. The method of claim 1 , wherein the header compression comprises robust header compression (ROHC).

3. The method of claim 1 , further comprising:

receiving, at least one of SDAP header configuration information, header compression configuration information, or integrity protection configuration information through higher layer signaling.

4. 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, generating second data by removing, by the PDCP entity, a PDCP header from the first data;

generating third data by performing, by the PDCP entity, deciphering on the second data except a service data adaptation protocol (SDAP) header and the removed PDCP header;

generating fourth data by performing, by the PDCP entity, integrity verification on the third data including the SDAP header;

generating fifth data by performing, by the PDCP entity, header decompression on an upper layer header included in the fourth data; and

transmitting, to an upper layer by the PDCP entity, fifth data including the decompressed upper layer header.

5. The method of claim 4 , wherein the header decompression comprises decompression with respect to robust header compression (ROHC).

6. The method of claim 4 , further comprising:

receiving, at least one of SDAP header configuration information, header compression configuration information or integrity protection configuration information through higher layer signaling.

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

a transceiver; and

a controller implementing a service data adaptation protocol (SDAP) entity, a packet data convergence protocol (PDCP) entity, and a lower layer, the controller 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, to the PDCP entity by the SDAP entity, the second data,

generate third data by performing, by the PDCP entity, header compression on the upper layer header included in the second data, wherein the header compression is not applicable to the SDAP header,

generate fourth data with message authentication code for integrity (MAC-I) by performing, by the PDCP entity, integrity protection on the third data including the SDAP header and the header compressed upper layer header,

generate fifth data by performing, by the PDCP entity, ciphering on the fourth data except the SDAP header,

generate, by the PDCP entity, sixth data by adding a PDCP header to the fifth data, and

transmit, to the lower layer by the PDCP entity, the sixth data.

8. The transmitting apparatus of claim 7 , wherein the header compression comprises robust header compression (ROHC).

9. The transmitting apparatus of claim 7 , wherein the controller is further configured to:

receive, via the transceiver, at least one of SDAP header configuration information, header compression configuration information or integrity protection configuration information through higher layer signaling.

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

a transceiver; and

a controller implementing a packet data convergence protocol (PDCP) entity and a lower layer, the controller configured to:

based on receiving first data, from a lower layer by the PDCP entity, generate second data by removing, by the PDCP entity, a PDCP header from first data,

generate third data by performing, by the PDCP entity, deciphering on the second data except a service data adaptation protocol (SDAP) header and the removed PDCP header,

generate fourth data by performing, by the PDCP entity, integrity verification on the third data including the SDAP header,

generate fifth data by performing, by the PDCP entity, header decompression on an upper layer header included in the fourth data, and

transmit, to an upper layer by the PDCP entity, fifth data including the decompressed upper layer header.

11. The receiving apparatus of claim 10 , wherein the header decompression comprises decompression with respect to robust header compression (ROHC).

12. The receiving apparatus of claim 10 , wherein the controller is further configured to:

receive, via the transceiver, at least one of SDAP header configuration information, header compression configuration information or integrity protection configuration information through higher layer signaling.