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 in which a first apparatus performs wireless communication, the method comprising:
receiving, from a base station, first information related to a set of resource blocks (RBs) available for the first apparatus to transmit a physical sidelink feedback channel (PSFCH) and second information related to a number of cyclic shifts available for the first apparatus to transmit the PSFCH;
receiving, from a second apparatus, a physical sidelink shared channel (PSSCH);
determining a PSFCH resource related the PSSCH, based on the first information related to the set of RBs and the second information related to the number of cyclic shifts; and
transmitting, to the second apparatus, Hybrid Automatic Repeat Request (HARQ) information based on the PSFCH resource.
2. The method of claim 1 , wherein the HARQ information is transmitted by using the PSFCH resource to the second apparatus.
3. The method of claim 1 , further comprising:
applying one cyclic shift among the number of cyclic shifts to the HARQ information.
4. The method of claim 3 , wherein the number of cyclic shifts is a number of cyclic shift pairs.
5. The method of claim 1 , wherein the set of RBs available to transmit the PSFCH is configured for the first apparatus in a resource pool.
6. The method of claim 1 , wherein the first information related to the set of RBs available to transmit the PSFCH 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 an RB related to 1 of the bitmap is an RB available to transmit the PSFCH, and an RB related to 0 of the bitmap is an RB unavailable to transmit the PSFCH.
9. The method of claim 1 , further comprising:
receiving, from the base station, third information related to a slot available for the first apparatus to transmit the PSFCH.
10. The method of claim 1 , further comprising:
receiving, from the base station, fourth information related to a PSFCH format available for the first apparatus to transmit the PSFCH.
11. The method of claim 1 , wherein the PSSCH includes a plurality of PSSCHs.
12. The method of claim 11 , wherein a resource used by the first apparatus to transmit the PSFCH is a PSFCH resource related to a last received PSSCH among the plurality of PSSCHs received by the first apparatus.
13. A first apparatus configured to perform wireless communication, the first apparatus comprising:
one or more memories storing instructions;
one or more transceivers; and
one or more processors connected to the one or more memories and the one or more transceivers,
wherein based on the one or more processors executing the instructions, the one or more processors control the first apparatus to:
receive, from a base station, first information related to a set of resource blocks (RBs) available for the first apparatus to transmit a physical sidelink feedback channel (PSFCH) and second information related to a number of cyclic shifts available for the first apparatus to transmit the PSFCH;
receive, from a second apparatus, a physical sidelink shared channel (PSSCH);
determine a PSFCH resource related the PSSCH, based on the first information related to the set of RBs and the second information related to the number of cyclic shifts; and
transmit, to the second apparatus, Hybrid Automatic Repeat Request (HARQ) information based on the PSFCH resource.
14. An apparatus configured to control a first user equipment (UE), the apparatus comprising:
one or more processors; and
one or more memories operatively connected to the one or more processors and storing instructions,
wherein based on the one or more processors executing the instructions, the one or more processors control the first UE to:
receive, from a base station, first information related to a set of resource blocks (RBs) available for the first UE to transmit a physical sidelink feedback channel (PSFCH) and second information related to a number of cyclic shifts available for the first UE to transmit the PSFCH;
receive, from a second UE, a physical sidelink shared channel (PSSCH);
determine a PSFCH resource related the PSSCH, based on the first information related to the set of RBs and the second information related to the number of cyclic shifts; and
transmit, to the second UE, Hybrid Automatic Repeat Request (HARQ) information based on the PSFCH resource.