Method and device for reporting channel state information in NR V2X
Provided are a method for transmitting sidelink channel state information by a first device ( 100 ), and a device supporting same. The method may comprise the steps of: measuring channel states for a plurality of resources; and transmitting, to a second device ( 200 ), channel state information associated with a part of the plurality of resources.
1. A method for performing, by a first device, sidelink (SL) communication, the method comprising:
transmitting, to a second device, sidelink control information (SCI) based on a first physical sidelink control channel (PSCCH);
transmitting, to the second device, an aperiodic sidelink channel state information-reference signal (SL CSI-RS) based on a first physical sidelink shared channel (PSSCH) related to the first PSCCH; and
receiving, from the second device, channel state information obtained based on the aperiodic SL CSI-RS,
wherein the aperiodic SL CSI-RS is transmitted only in a resource used for the first PSSCH related to the first PSCCH.
2. The method of claim 1 , wherein the aperiodic SL CSI-RS is not transmitted in a resource for a PSCCH.
3. The method of claim 1 , wherein the SCI includes information for triggering a report of the channel state information.
4. The method of claim 1 , wherein the channel state information is obtained based on channel state measurement for a partial resource among a plurality of resources.
5. The method of claim 4 , wherein the channel state information is obtained based on the channel state measurement for N percent resources having a poor channel state among the plurality of resources.
6. The method of claim 4 , wherein the channel state information is obtained based on the channel state measurement for N percent resources having a good channel state among the plurality of resources.
7. The method of claim 5 , further comprising:
transmitting, to the second device or a base station, at least one of information on the N or information on the plurality of resources.
8. The method of claim 5 , wherein the at least one of information on the N or information on the plurality of resources is configured based on at least one of a service type, a service priority, a service-related ProSe Per Packet Priority (PPPP), a service-related ProSe Per Packet Reliability (PPPR), a service-related target Block Error Rate (BLER), or a service-related target Signal to Interference plus Noise Ratio (SINR).
9. The method of claim 4 , wherein the plurality of resources are resources related to SL communication.
10. The method of claim 4 , wherein the plurality of resources are resources for the SL communication between the first device and the second device.
11. The method of claim 4 , further comprising:
transmitting information on the partial resource.
12. The method of claim 1 , further comprising:
transmitting, to a base station, the channel state information.
13. The method of claim 1 , wherein the channel state information includes information on a ratio of resources that is able to expect a specific channel state.
14. The method of claim 1 , wherein the channel state information includes (i) channel state information measured on a resource being used for the SL communication between the first device and the second device and (ii) channel state information measured on a resource not being used for the SL communication between the first device and the second device.
15. The method of claim 1 , wherein the channel state information received from the second device based on a PSSCH.
16. A first device adapted to perform wireless communication, the first device comprising:
at least one transceiver;
at least one processor; and
at least one memory connected to the at least one processor and storing instructions that, based on being executed, cause the at least one processor to perform operations comprising:
transmitting, to a second device, sidelink control information (SCI) based on a first physical sidelink control channel (PSCCH);
transmitting, to the second device, an aperiodic sidelink channel state information-reference signal (SL CSI-RS) based on a first physical sidelink shared channel (PSSCH) related to the first PSCCH; and
receiving, from the second device, channel state information obtained based on the aperiodic SL CSI-RS,
wherein the aperiodic SL CSI-RS is transmitted only in a resource used for the first PSSCH related to the first PSCCH.
17. The first device of claim 16 , wherein the aperiodic SL CSI-RS is not transmitted in a resource for a PSCCH.
18. A processing device adapted to control a first device to perform wireless communication, the processing device comprising:
at least one processor; and
at least one memory connected to the at least one processor and storing instructions that, based on being executed, cause the at least one processor to perform operations comprising:
transmitting, to a second device, sidelink control information (SCI) based on a first physical sidelink control channel (PSCCH);
transmitting, to the second device, an aperiodic sidelink channel state information-reference signal (SL CSI-RS) based on a first physical sidelink shared channel (PSSCH) related to the first PSCCH; and
receiving, from the second device, channel state information obtained based on the aperiodic SL CSI-RS,
wherein the aperiodic SL CSI-RS is transmitted only in a resource used for the first PSSCH related to the first PSCCH.