Method by which terminal transmits sidelink feedback to base station in wireless communication system
A method for performing an operation for a first terminal in a wireless communication system, in one embodiment, comprises the steps of: determining, by the first terminal, a slot that is to transmit a physical uplink control channel (PUCCH), on the basis of a value for indicating the number of slots from a physical sidelink feedback channel (PSFCH) to the PUCCH; and transmitting, by the first terminal, PSFCH-based feedback information in the slot through the PUCCH to a base station, wherein the value for indicating, on the basis the slot for the PUCCH and the slot for the PSFCH not being synchronized with each other, the number of slots is a value corrected by the first terminal on the basis of a synchronization difference between the slot for the PUCCH and the slot for the PSFCH.
1. A method of operating a first user equipment (UE) in a wireless communication system, the method comprising:
receiving, by the first UE, Hybrid Automatic Repeat and reQuest acknowledgement (HARQ-ACK) information through a physical sidelink feedback channel (PSFCH),
determining, by the first UE, a slot to transmit a physical uplink control channel (PUCCH) based on a value representing the number of slots from a physical sidelink feedback channel (PSFCH) to the PUCCH with assumption that a sidelink slot boundary is aligned with a downlink slot boundary; and
transmitting, by the first UE to a base station (B S), feedback information based on the HARQ-ACK information through the PUCCH on the slot.
2. The method according to claim 1 , wherein based on a slot for the PUCCH being asynchronous with a slot for the PSFCH, the value representing the number of slots is a value corrected based on a synchronization difference between the slot for the PUCCH and the slot for the PSFCH by the first UE, and
wherein the corrected value is obtained by subtracting a time difference between the slot for the PUCCH and the slot for the PSFCH from the value representing the number of slots.
3. The method according to claim 1 , wherein the first UE has a device related to a global navigation satellite system (GNSS) as a synchronization reference.
4. The method according to claim 1 , wherein based on the slot for the PUCCH being synchronized with the slot for the PSFCH, a reference point for applying the value representing the number of slots is n+(2{u_UL}/2{u_SL}) where n represents the last of slots for the PUCCH overlapping with the slot for the PSFCH, u UL represents an uplink numerology, and u_SL represents a sidelink numerology.
5. The method according to claim 4 , wherein a relationship between the numerologies represented by u_UL and u_SL is based on the following table,
Number of
Number of
Number of
U
symbols per slot
slots per frame
slots per subframe
0
14
10
1
1
14
20
2
2
14
40
4
3
14
80
8
4
14
160
16
6. The method according to claim 1 , wherein the feedback information transmitted on the PUCCH is a bundle of a plurality of pieces of feedback information.
7. The method according to claim 6 , wherein the bundled feedback information is 1 bit.
8. The method according to claim 6 , wherein the plurality of pieces of feedback information are for a plurality of transport blocks.
9. The method according to claim 1 , wherein the slot for the PUCCH corresponds to a slot available for transmission of the PUCCH.
10. The method according to claim 1 , wherein the slot for the PSFCH is one of a slot in which the PSFCH is received or a slot scheduled for reception of the PSFCH.
11. A first user equipment (UE) apparatus configured to operate in a wireless communication system, the first UE comprising:
at least one processor; and
at least one computer memory operatively coupled to the at least one processor and storing instructions which when executed, cause the at least one processor to perform operations comprising:
receiving Hybrid Automatic Repeat and reQuest acknowledgement (HARQ-ACK) information through a physical sidelink feedback channel (PSFCH),
determining a slot to transmit a physical uplink control channel (PUCCH) based on a value representing the number of slots from a physical sidelink feedback channel (PSFCH) to the PUCCH with assumption that a sidelink slot boundary is aligned with a downlink slot boundary; and
transmitting feedback information based on the HARQ-ACK information through the PUCCH on the slot to a base station (BS).
12. The first UE apparatus according to claim 11 , wherein the first UE is an autonomous driving vehicle or is included in the autonomous driving vehicle.
13. A non-transitory computer-readable medium storing instructions which when executed by at least one processor, cause the at least one processor to perform operations for a first user equipment (UE), the operations comprising:
receiving Hybrid Automatic Repeat and reQuest acknowledgement (HARQ-ACK) information through a physical sidelink feedback channel (PSFCH),
determining a slot to transmit a physical uplink control channel (PUCCH) based on a value representing the number of slots from a physical sidelink feedback channel (PSFCH) to the PUCCH with assumption that a sidelink slot boundary is aligned with a downlink slot boundary; and
transmitting feedback information based on the HARQ-ACK information through the PUCCH on the slot.