Rate matching performing method for LDPC code and communication device therefor

1. A method of performing rate matching for a low-density parity check (LDPC) code by a user equipment (UE), the method comprising:

receiving indication information on whether limited buffer rate matching (LBRM) is applied;

determining a transport block size (TBS) based on the indication information; and

performing rate matching for the LDPC code based on the TBS,

wherein the indication information includes information on a maximum number of TBSs configured for the LBRM, and

wherein, based on the LBRM being configured for the UE, the TBS is determined as the maximum value among the maximum number of TBSs.

2. The method of claim 1 , wherein the rate matching is related to limited buffer rate matching (LBRM), the method further comprising: receiving information about the LBRM configured for the UE from a base station (BS).

3. The method of claim 2 , wherein the TBS is determined based on the number of resource elements (REs) allocated to one physical resource block (PRB).

4. The method of claim 3 , wherein the number of REs allocated to the one PRB is determined based on reference signal (RS) overhead.

5. The method of claim 3 , wherein the number of REs allocated to the one PRB is differently configured according to a provided service type.

6. The method of claim 3 , further comprising:

receiving information about the number of REs allocated to the one PRB from the BS.

7. The method of claim 2 , wherein the TBS differs according to the size of coded bits defined by the LBRM.

8. The method of claim 1 , wherein, the TBS is determined based on only a specific code rate among a plurality of code rates is used.

9. A user equipment (UE) for performing rate matching for a low-density parity check (LDPC) code, the UE comprising

a transceiver; and one or more processors connected to the transceiver,

wherein the one or more processors are configured to:

receive indication information on whether limited buffer rate matching (LBRM) is applied;

determine a transport block size (TBS) based on the indication information; and

perform rate matching for the LDPC code based on the determined TBS,

wherein the indication information includes information on a maximum number of TBSs configured for the LBRM, and

wherein, based on the LBRM being configured for the UE, the TBS is determined as the maximum value among the maximum number of TBSs.

10. The UE of claim 9 , wherein the rate matching is related to limited buffer rate matching (LBRM), the method further comprising: a receiver configured to receive information about the LBRM configured for the UE from a base station (BS).

11. The UE of claim 10 , wherein the TBS is determined by the processor based on the number of resource elements (REs) allocated to one physical resource block (PRB).

12. The UE of claim 11 , wherein the processor is configured to determine the number of REs allocated to the one PRB based on reference signal (RS) overhead in the one PRB.

13. The UE of claim 11 , wherein the number of REs allocated to the one PRB is differently configured according to a provided service type.

14. The UE of claim 11 , further comprising a receiver configured to receive information about the number of REs allocated to the one PRB from the BS.

15. The UE of claim 10 , wherein the TBS differs according to the number of coded bits defined by the LBRM.

16. The UE of claim 9 , wherein the processor is further configured to determine the TBS based on only a specific code rate among a plurality of code rates is used.

17. The UE according to claim 9 , wherein the UE is capable of communicating with at least one of another UE, a UE related to an autonomous driving vehicle, a base station or a network.