Method and apparatus for transmitting PSFCH in NR V2X
A method in which a first apparatus performs wireless communication and an apparatus supporting the same are provided. The method may include: receiving information related to a physical sidelink feedback channel (PSFCH) resource from a base station; receiving a physical sidelink shared channel (PSSCH) from a second apparatus; and transmitting a PSFCH related to the PSSCH to the second apparatus. Here, the information related to the PSFCH resource may include, for example, information related to a resource block (RB) available for the first apparatus to transmit the PSFCH.
1. A method for performing wireless communication by a device, the method comprising:
obtaining physical sidelink feedback channel (PSFCH) configuration including (i) information related to a period of a PSFCH resource, (ii) information related to a set of resource blocks (RBs) that are actually used for PSFCH transmission, and (iii) information related to a number of cyclic shift pairs used for PSFCH transmission;
receiving at least one physical sidelink shared channel (PSSCH);
determining at least one PSFCH resource related to the at least one PSSCH, based on the PSFCH configuration; and
transmitting hybrid automatic repeat request-acknowledgement (HARQ-ACK) information, based on the at least one PSFCH resource.
2. The method of claim 1 , wherein the HARQ-ACK information includes positive acknowledgement or negative acknowledgement.
3. The method of claim 1 , further comprising:
applying one cyclic shift from the cyclic shift pairs to the HARQ-ACK information.
4. The method of claim 1 , wherein the at least one PSFCH resource related to the at least one PSSCH is determined, based on (i) the PSFCH configuration, (ii) at least one slot index related to the at least one PSSCH, and (iii) at least one sub-channel index related to the at least one PSSCH.
5. The method of claim 1 , wherein the set of RBs that are actually used for PSFCH transmission is configured for the device in a resource pool.
6. The method of claim 1 , wherein the information related to the set of RBs that are actually used for PSFCH transmission is a bitmap.
7. The method of claim 6 , wherein each bit of the bitmap indicates each RB in a resource pool.
8. The method of claim 7 , wherein, in the set of RBs, a first RB indicated by value 1 in the bitmap is used for PSFCH transmission and a second RB indicated by value 0 in the bitmap is not used for PSFCH transmission.
9. The method of claim 1 , wherein the period of the PSFCH resource is a number of sidelink slots between a first PSFCH resource and a second PSFCH resource, and
wherein the first PSFCH resource and the second PSFCH resource are adjacent.
10. A device adapted to perform wireless communication, the device comprising:
one or more processors; one or more transceivers; and
one or more memories operatively connected to the one or more processors and storing instructions that, based on being executed by the one or more processors, perform operations comprising:
obtaining physical sidelink feedback channel (PSFCH) configuration including (i) information related to a period of a PSFCH resource, (ii) information related to a set of resource blocks (RBs) that are actually used for PSFCH transmission, and (iii) information related to a number of cyclic shift pairs used for PSFCH transmission;
receiving at least one physical sidelink shared channel (PSSCH);
determining at least one PSFCH resource related to the at least one PSSCH, based on the PSFCH configuration; and
transmitting hybrid automatic repeat request-acknowledgement (HARQ-ACK) information, based on the at least one PSFCH resource.
11. The device of claim 10 , wherein the HARQ-ACK information includes positive acknowledgement or negative acknowledgement.
12. The device of claim 10 , wherein the operations further comprise:
applying one cyclic shift from the cyclic shift pairs to the HARQ-ACK information.
13. The device of claim 10 , wherein the at least one PSFCH resource related to the at least one PSSCH is determined, based on (i) the PSFCH configuration, (ii) at least one slot index related to the at least one PSSCH, and (iii) at least one sub-channel index related to the at least one PSSCH.
14. The device of claim 10 , wherein the information related to the set of RBs that are actually used for PSFCH transmission is a bitmap.
15. The device of claim 14 , wherein each bit of the bitmap indicates each RB in a resource pool.
16. A processing device adapted to control a device, the processing device comprising:
one or more processors; and
one or more memories operatively connected to the one or more processors and storing instructions that, based on being executed by the one or more processors, perform operations comprising:
obtaining physical sidelink feedback channel (PSFCH) configuration including (i) information related to a period of a PSFCH resource, (ii) information related to a set of resource blocks (RBs) that are actually used for PSFCH transmission, and (iii) information related to a number of cyclic shift pairs used for PSFCH transmission;
receiving at least one physical sidelink shared channel (PSSCH);
determining at least one PSFCH resource related to the at least one PSSCH, based on the PSFCH configuration; and
transmitting hybrid automatic repeat request-acknowledgement (HARQ-ACK) information, based on the at least one PSFCH resource.
17. The processing device of claim 16 , wherein the HARQ-ACK information includes positive acknowledgement or negative acknowledgement.
18. The processing device of claim 16 , wherein the operations further comprise:
applying one cyclic shift from the cyclic shift pairs to the HARQ-ACK information.
19. The processing device of claim 16 , wherein the at least one PSFCH resource related to the at least one PSSCH is determined, based on (i) the PSFCH configuration, (ii) at least one slot index related to the at least one PSSCH, and (iii) at least one sub-channel index related to the at least one PSSCH.
20. The processing device of claim 16 , wherein the information related to the set of RBs that are actually used for PSFCH transmission is a bitmap.