2-step SCI transmission of NR V2X

1. A method for performing sidelink (SL) communication by a first apparatus, the method including:

transmitting a first sidelink control information (SCI) to a second apparatus through physical sidelink control channel (PSCCH); and

transmitting a second SCI to the second apparatus through physical sidelink shared channel (PSSCH) related to the PSCCH,

wherein the first SCI includes information for resource of the second SCI, and

wherein the information for the resource of the second SCI includes information on number of resource elements (REs) to which the second SCI is mapped and a coding rate.

2. The method of claim 1 , wherein the information on the number of REs to which the second SCI is mapped and the coding rate is mapped includes information on a beta offset.

3. The method of claim 2 , wherein the information on the beta offset includes a beta offset indicator for indicating the beat offset, and wherein the beta offset indicator is represented by 2 bits.

4. The method of claim 1 , wherein the first SCI includes at least one of information on a time or frequency resource of the PSSCH, modulation and coding scheme (MCS) information required in decoding of the PSSCH, and priority information for data on the PSSCH.

5. The method of claim 1 , wherein the second SCI includes at least one of information on a source ID or destination ID for data on the PSSCH, hybrid automatic repeat request (HARQ) process ID information, a new data indicator (NDI), and a redundancy version (RV).

6. The method of claim 1 , wherein a resource region for transmitting the first SCI and a resource region for transmitting the second SCI do not overlap with each other.

7. The method of claim 1 , wherein data on the PSSCH is decoded by the second apparatus, based on a result of decoding performed on the first SCI and the second SCI by the second apparatus.

8. The method of claim 6 ,

wherein the first SCI is transmitted to a third apparatus through the PSSCH, and

wherein the data on the PSSCH is not decoded by the third apparatus, based on a result on decoding performed on the first SCI and the second SCI by the third apparatus.

9. A first apparatus for performing SL communication, comprising:

at least one memory storing instructions;

at least one transceiver; and

at least one processor coupling the at least one memory and the at least one transceiver,

wherein the at least one processor is configured to:

control the at least one transceiver to transmit a first sidelink control information (SCI) to a second apparatus through a physical sidelink control channel (PSCCH); and

control the at least one transceiver to transmit a second SCI to the second apparatus through a physical sidelink shared channel (PSSCH) related to the PSCCH,

wherein the first SCI includes information for resource of the second SCI, and

wherein the information for the resource of the second SCI includes information on number of resource elements (REs) to which the second SCI is mapped and a coding rate.

10. The first apparatus of claim 9 , wherein the information on the number of REs to which the second SCI is mapped and the coding rate includes information on a beta offset.

11. The first apparatus of claim 9 , wherein the information on the beta offset includes a beta offset indicator for indicating the beta offset, and

wherein the beta offset indicator is represented by 2 bits.

12. The first apparatus of claim 9 , wherein a resource region for transmitting the first SCI and a resource region for transmitting the second SCI do not overlap with each other.

13. An apparatus controlling a first apparatus, the apparatus comprising:

at least one processor; and

at least one computer memory coupled by the at least one processor in an executable manner and storing instructions,

wherein the at least one processor executes the instructions, so that the first terminal is configured to:

transmit a first sidelink control information (SCI) to a second apparatus through a physical sidelink control channel (PSCCH); and

transmit a second SCI to the second apparatus through a physical sidelink shared channel (PSSCH) related to the PSCCH,

wherein the first SCI includes information for resource of the second SCI, and

wherein the information for the resource of the second SCI includes information on number of resource elements (REs) to which the second SCI is mapped and a coding rate.