Method and device for transmitting and receiving HARQ feedback information on basis of SCI format in NR V2X
Provided are a method for a first device to perform wireless communication, and a device for supporting same. The method may include: receiving, from a second device, a first sidelink control information (SCI) through a physical sidelink control channel (PSCCH); receiving, from the second device, a second SCI through a physical sidelink shared channel (PSSCH) related to the PSCCH; determining a physical sidelink feedback channel (PSFCH) resource, based on an index of a slot and an index of a subchannel related to the PSSCH; and determining whether or not to transmit hybrid automatic repeat request (HARQ) feedback information for the PSSCH to the second device on the PSFCH resource, wherein a format of the second SCI is a first format which does not include location information of the second device or a second format which includes location information of the second device.
1. A method for performing wireless communication by a first device, the method comprising:
receiving, from a second device, a first sidelink control information (SCI) through a physical sidelink control channel (PSCCH); and
receiving, from the second device, a second SCI and data through a physical sidelink shared channel (PSSCH) related to the PSCCH,
wherein a format of the second SCI is a second format of a plurality of formats, the second format including location information, and
wherein based on the second SCI:
negative-only HARQ feedback is enabled; and
the method further comprises:
obtaining a distance based on the location information included in the second format and location information of the first device; and
generating a negative acknowledgement of the data, based on (i) the obtained distance being smaller than or equal to a communication range requirement and (ii) a failure of the first device to decode the data.
2. The method of claim 1 , further comprising:
determining a physical sidelink feedback channel (PSFCH) resource, based on an index of a slot and an index of a subchannel related to the PSSCH; and
transmitting, to the second device, the negative acknowledgement of the data based on the PSFCH resource.
3. The method of claim 1 , wherein, based on successful decoding of the data by the first device, a positive acknowledgement of the data is not generated.
4. The method of claim 1 , wherein information regarding the communication range requirement is included in the second SCI having the second format.
5. The method of claim 1 , further comprising:
determining that the distance-based negative-only HARQ feedback is enabled based on the format of the second SCI being the second format.
6. The method of claim 1 , wherein the location information included in the second format is an identifier (ID) of a zone.
7. A first device adapted to perform wireless communication, the first device 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 the one or more processors execute the instructions to:
receive, from a second device, a first sidelink control information (SCI) through a physical sidelink control channel (PSCCH);
receive, from the second device, a second SCI and data through a physical sidelink shared channel (PSSCH) related to the PSCCH, and
wherein a format of the second SCI is a second format of a plurality of formats, the second format including location information, and
wherein based on the second SCI:
negative-only HARQ feedback is enabled; and
the one or more processors:
obtain a distance based on the location information included in the second format and location information of the first device; and
generate a negative acknowledgement of the data, based on (i) the obtained distance being smaller than or equal to a communication range requirement and (ii) a failure of the first device to decode the data.
8. The first device of claim 7 , wherein the one or more processors further execute the instructions to:
determine a physical sidelink feedback channel (PSFCH) resource, based on an index of a slot and an index of a subchannel related to the PSSCH; and
control the one or more transceivers to transmit, to the second device, the negative acknowledgement of the data based on the PSFCH resource.
9. The first device of claim 7 , wherein, based on successful decoding of the data by the first device, a positive acknowledgement of the data is not generated.
10. The first device of claim 7 , wherein information regarding the communication range requirement is included in the second SCI having the second format.
11. The first device of claim 7 , wherein the one or more processors further execute the instructions to: determine that the distance-based negative-only HARQ feedback is enabled based on the format of the second SCI being the second format.
12. The first device of claim 7 , wherein the location information included in the second format is an identifier (ID) of a zone.
13. A processing device adapted to control a first device performing wireless communication, the processing device comprising:
one or more processors; and
one or more memories operably connected to the one or more processors and storing instructions, wherein the one or more processors execute the instructions to:
receive, from a second device, a first sidelink control information (SCI) through a physical sidelink control channel (PSCCH);
receive, from the second device, a second SCI and data through a physical sidelink shared channel (PSSCH) related to the PSCCH; and
wherein a format of the second SCI is a second format of a plurality of formats, the second format including location information, and
wherein based on the second SCI:
negative-only HARQ feedback is enabled; and
the one or more processors execute the instructions to:
obtain a distance based on the location information included in the second format and location information of the first device; and
generate a negative acknowledgement of the data, based on (i) the obtained distance being smaller than or equal to a communication range requirement and (ii) a failure of the first device to decode the data.
14. The processing device of claim 13 , wherein the one or more processors further execute the instructions to:
determine a physical sidelink feedback channel (PSFCH) resource, based on an index of a slot and an index of a subchannel related to the PSSCH; and
transmit, to the second device, the negative acknowledgement of the data based on the PSFCH resource.
15. The processing device of claim 13 , wherein, based on successful decoding of the data by the first device, a positive acknowledgement of the data is not generated.
16. The processing device of claim 13 , wherein information regarding the communication range requirement is included in the second SCI having the second format.
17. The processing device of claim 13 , wherein the location information included in the second format is an identifier (ID) of a zone.