Method and apparatus for transmitting and receiving channel state information-reference signal (CSI-RS)
Disclosed is a method for transmitting and receiving a channel state information (CSI)-reference signal (RS) in a wireless communication system. Specifically, the method performed by a base station may include: configuring control information indicating that an antenna port for all CSI-RS resources included in a CSI-RS resource set is same, wherein the CSI-RS resource set is used for tracking at least one of a time or a frequency; transmitting the configured control information to a user equipment (UE); and transmitting the CSI-RS to the UE through all the CSI-RS resources. In doing so, the UE is capable of performing time/frequency tracking more precisely.
1. A method of transmitting, by a base station, a channel state information (CSI)-reference signal (RS) in a wireless communication system, the method comprising:
configuring control information for a plurality of CSI-RS resources, with the control information indicating that an antenna port for the plurality of CSI-RS resources configured for tracking at least one of a time or a frequency is the same;
transmitting, to a user equipment (UE), the control information; and
transmitting, to the UE, the CSI-RS through same antenna port on the plurality of CSI-RS resources based on the control information,
wherein the plurality of CSI-RS resources are configured in a single slot and located at different symbol locations in the single slot, and only one of the plurality of CSI-RS resources is located at a single symbol in the single slot,
wherein different symbol locations of the plurality of CSI-RS resources in the single slot are not contiguous, and
wherein a time domain measurement restriction related to the plurality of CSI-RS resources is not configured.
2. The method of claim 1 , wherein the UE is in a radio resource control (RRC) connected state.
3. The method of claim 1 , wherein code division multiplexing (CDM) is not applied to the plurality of CSI-RS resources.
4. The method of claim 1 , wherein a frequency domain density of each of the plurality of CSI-RS resources is greater than 1.
5. The method of claim 1 , wherein a first CSI-RS resource, among the plurality of CSI-RS resources that are used for the tracking is quasi co-located (QCL) with (i) a second CSI-RS resource that is used for CSI acquisition, (ii) a third CSI-RS resource that is used for beam management, or (iii) an synchronization signal/physical broadcast channel block (SSB).
6. The method of claim 1 , wherein a linkage between the plurality of CSI-RS resources and a specific report setting is set.
7. The method of claim 6 , wherein the specific report setting is null report setting.
8. The method of claim 1 , further comprising:
receiving, from the UE, information related to a time-domain density of the CSI-RS resources.
9. A method of receiving, by a user equipment (UE), a channel state information (CSI)-reference signal (RS) in a wireless communication system, the method comprising:
receiving, from a base station, configuration information for a plurality of CSI-RS resources, wherein the configuration information comprises control information indicating that an antenna port for the plurality of CSI-RS resources configured for tracking at least one of a time or a frequency is the same;
receiving, from the base station, the CSI-RS through same antenna port on the plurality of CSI-RS resources based on the control information; and
tracking at least one of the time or the frequency based on the CSI-RS,
wherein the plurality of CSI-RS resources are configured in a single slot and located at different symbol locations in the single slot, and only one of the plurality of CSI-RS resources is located at a single symbol in the single slot,
wherein different symbol locations of the plurality of CSI-RS resources in the single slot are not contiguous, and
wherein a time domain measurement restriction related to the plurality of CSI-RS resources is not configured.
10. A base station configured to transmit a channel state information (CSI)-reference signal (RS) in a wireless communication system, the base station comprising:
a transmitter configured to transmit a wireless signal;
a receiver configured to receive a wireless signal;
at least one processor; and
at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed, cause the at least one processor perform operations comprising:
configuring control information for a plurality of CSI-RS resources, with the control information indicating that an antenna port for the plurality of CSI-RS resources configured for tracking at least one of a time or a frequency is the same;
transmitting, to a user equipment (UE), the control information; and
transmitting, to the UE, the CSI-RS through same antenna port on the plurality of CSI-RS resources based on the control information,
wherein the plurality of CSI-RS resources are configured in a single slot and located at different symbol locations in the single slot, and only one of the plurality of CSI-RS resources is located at a single symbol in the single slot,
wherein different symbol locations of the plurality of CSI-RS resources in the single slot are not contiguous, and
wherein a time domain measurement restriction related to the plurality of CSI-RS resources is not configured.
11. The base station of claim 10 , wherein the UE is in a radio resource control (RRC) connected state.
12. The base station of claim 10 , wherein code division multiplexing (CDM) is not applied to the plurality of CSI-RS resources.
13. The base station of claim 10 , wherein a frequency domain density of each of the plurality of CSI-RS resources is greater than 1.
14. The base station of claim 10 , wherein a first CSI-RS resource, among the plurality of CSI-RS resources that are used for the tracking is quasi co-located (QCL) with (i) a second CSI-RS resource that is used for CSI acquisition, (ii) a third CSI-RS resource that is used for beam management, or (iii) an synchronization signal/physical broadcast channel block (SSB).
15. The base station of claim 10 , wherein a linkage between the plurality of CSI-RS resources and a specific report setting is set.
16. The base station of claim 15 , wherein the specific report setting is null report setting.
17. The base station of claim 10 , wherein the operations further comprise:
receiving, from the UE, information related to a time-domain density of the CSI-RS resources.
18. The method of claim 1 , wherein the plurality of CSI-RS resources are not configured both for the tracking and for reporting layer 1(L1)-reference signal received power (RSRP).
19. A terminal configured to receive a channel state information (CSI)-reference signal (RS) in a wireless communication system, the terminal comprising:
a transmitter configured to transmit a wireless signal;
a receiver configured to receive a wireless signal;
at least one processor; and
at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed, cause the at least one processor perform operations comprising:
receiving, from a base station, configuration information for a plurality of CSI-RS resources, wherein the configuration information comprises control information indicating that an antenna port for the plurality of CSI-RS resources configured for tracking at least one of a time or a frequency is the same;
receiving, from the base station, the CSI-RS through same antenna port on the plurality of CSI-RS resources based on the control information; and
tracking at least one of the time or the frequency based on the CSI-RS,
wherein the plurality of CSI-RS resources are configured in a single slot and located at different symbol locations in the single slot, and only one of the plurality of CSI-RS resources is located at a single symbol in the single slot,
wherein different symbol locations of the plurality of CSI-RS resources in the single slot are not contiguous, and
wherein a time domain measurement restriction related to the plurality of CSI-RS resources is not configured.