Method and device for transmitting reference signal in NR V2X
A method by which a first device performs wireless communication, and a device for supporting same are provided. The method comprises the steps of: receiving information associated with a first symbol for transmitting a channel state information-reference signal (CSI-RS); determining whether the CSI-RS is transmitted on the first symbol on the basis of the information associated with the first symbol and information associated with a second symbol for transmitting a physical sidelink shared channel (PSSCH); transmitting first sidelink control information (SCI) to a second device on the basis of a resource associated with a physical sidelink control channel (PSCCH); and transmitting, to the second device, second SCI including information associated with a channel state information (CSI) request on the basis of the resource associated with the PSSCH.
1. A method for performing wireless communication by a first device, the method comprising:
receiving information related to a first symbol for transmission of a channel state information-reference signal (CSI-RS);
determining whether to transmit the CSI-RS on the first symbol, based on the information related to the first symbol and information related to a second symbol for transmission of a physical sidelink shared channel (PSSCH);
transmitting, to a second device, first sidelink control information (SCI) based on a resource related to a physical sidelink control channel (PSCCH); and
transmitting, to the second device, second SCI including information related to a channel state information (CSI) request based on a resource related to the PSSCH.
2. The method of claim 1 , wherein, based on the first symbol not being included in the second symbol, the first device determines not to transmit the CSI-RS on the first symbol.
3. The method of claim 2 , wherein the information related to the CSI request is information representing that CSI is not requested, and
wherein the CSI-RS is not transmitted on the first symbol in the resource related to the PSSCH.
4. The method of claim 2 , wherein a number of second symbols is different for each slot based on whether a physical sidelink feedback channel (PSFCH) resource is configured for a slot.
5. The method of claim 1 , wherein the first symbol and a symbol related to a demodulation reference signal (DMRS) do not overlap in a time domain.
6. The method of claim 1 , wherein the first symbol and a symbol related to the second SCI do not overlap in a time domain.
7. The method of claim 1 , wherein the CSI-RS is not transmitted by being overlapped with a phase tracking-reference signal (PT-RS).
8. The method of claim 1 , wherein, based on the first symbol being included in the second symbol, the first device determines to transmit the CSI-RS on the first symbol, and
wherein a number of second symbols is different for each slot based on whether a physical sidelink feedback channel (PSFCH) resource is configured for a slot.
9. The method of claim 8 , wherein the information related to the CSI request is information representing that CSI is requested, and
wherein the CSI-RS is transmitted on the first symbol in the resource related to the PSSCH.
10. The method of claim 9 , further comprising:
receiving, from the second device, the CSI obtained by the second device based on the CSI-RS.
11. The method of claim 1 , wherein the second symbol for transmission of the PSSCH includes symbols other than a symbol for TX-RX switching among sidelink (SL) symbols in a slot.
12. The method of claim 11 , wherein, based on a resource related to a PSFCH being configured in the slot, the second symbol for transmission of the PSSCH includes symbols other than a symbol related to the PSFCH among the SL symbols in the slot.
13. The method of claim 1 , wherein the information related to the first symbol for transmission of the CSI-RS is received from the second device.
14. A first device configured 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:
control the one or more transceivers to receive information related to a first symbol for transmission of a channel state information-reference signal (CSI-RS);
determine whether to transmit the CSI-RS on the first symbol, based on the information related to the first symbol and information related to a second symbol for transmission of a physical sidelink shared channel (PSSCH);
control the one or more transceivers to transmit, to a second device, first sidelink control information (SCI) based on a resource related to a physical sidelink control channel (PSCCH); and
control the one or more transceivers to transmit, to the second device, second SCI including information related to a channel state information (CSI) request based on a resource related to the PSSCH.
15. The first device of claim 14 , wherein, based on the first symbol not being included in the second symbol, the first device determines not to transmit the CSI-RS on the first symbol.
16. The first device of claim 15 , wherein the information related to the CSI request is information representing that CSI is not requested, and
wherein the CSI-RS is not transmitted on the first symbol in the resource related to the PSSCH.
17. The first device of claim 15 , wherein a number of second symbols is different for each slot based on whether a physical sidelink feedback channel (PSFCH) resource is configured for a slot.
18. The first device of claim 14 , wherein the first symbol and a symbol related to a demodulation reference signal (DMRS) do not overlap in a time domain.
19. The first device of claim 14 , wherein the first symbol and a symbol related to the second SCI do not overlap in a time domain.
20. An apparatus configured to control a first user equipment (UE), the apparatus 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 information related to a first symbol for transmission of a channel state information-reference signal (CSI-RS);
determine whether to transmit the CSI-RS on the first symbol, based on the information related to the first symbol and information related to a second symbol for transmission of a physical sidelink shared channel (PSSCH);
transmit, to a second UE, first sidelink control information (SCI) based on a resource related to a physical sidelink control channel (PSCCH); and
transmit, to the second UE, second SCI including information related to a channel state information (CSI) request based on a resource related to the PSSCH.