Reference signal reception method and user equipment, and reference signal transmission method and base station
A base station transmits low-density configuration information and high-density configuration information on a channel state information-reference signal (CSI-RS) of a beam. A user equipment performs beam measurement, using a CSI-RS received on the basis of the low-density configuration information (hereinafter, a low-density CSI-RS), and performs time tracking, using a CSI-RS received on the basis of the high-density configuration information (hereinafter, a high-density CSI-RS). At least in a frequency domain, the high-density CSI-RS is configured to have a higher density than that of the low-density CSI-RS.
1. A method of receiving a reference signal by a user equipment (UE) in a wireless communication system, the method comprising:
receiving low-density configuration information regarding a low-density channel state information reference signal (CSI-RS) for beam management and high-density configuration information regarding a high-density CSI-RS for time tracking,
wherein the high-density CSI-RS has a higher density at least in a frequency domain than the low-density CSI-RS, and
wherein the high-density CSI-RS configuration information includes information regarding a slot in which the high-density CSI-RS is present;
receiving downlink control information including information indicating a transmission of an aperiodic CSI-RS; and
based on the transmission of the aperiodic CSI-RS occurring in the slot indicated by the high-density CSI-RS configuration information, receiving the high-density CSI-RS as the periodic CSI-RS.
2. The method of claim 1 , further comprising:
performing frequency tracking using the high-density CSI-RS, wherein the high-density CSI-RS has a higher density in a time domain than the low-density CSI-RS.
3. The method of claim 1 , wherein the high-density CSI-RS is a periodic CSI-RS.
4. A method of transmitting a reference signal by a base station (BS) in a wireless communication system, the method comprising:
transmitting low-density configuration information regarding a low-density channel state information reference signal (CSI-RS) for beam management and high-density configuration information regarding a high-density CSI-RS for time tracking,
wherein the high-density CSI-RS has a higher density at least in a frequency domain than the low-density CSI-RS, and
wherein the high-density CSI-RS configuration information includes information regarding a slot in which the high-density CSI-RS is present;
transmitting downlink control information including information indicating a transmission of an aperiodic CSI-RS; and
based on the transmission of the aperiodic CSI-RS occurring in the slot indicated by the high-density CSI-RS configuration information, transmitting the high-density CSI-RS as the periodic CSI-RS.
5. The method of claim 4 , wherein the high-density CSI-RS has a higher density in a time domain than the low-density CSI-RS.
6. The method of claim 4 , wherein the high-density CSI-RS is a periodic CSI-RS.
7. A user equipment (UE) for receiving a reference signal in a wireless communication system, the UE comprising,
a radio frequency (RF) transceiver;
a processor;
a memory storing at least one program that causes the processor to perform operations comprising:
receiving low-density configuration information regarding a low-density channel state information reference signal (CSI-RS) for beam management and high-density configuration information regarding a high-density CSI-RS for time tracking,
wherein the high-density CSI-RS has a higher density at least in a frequency domain than the low-density CSI-RS, and
wherein the high-density CSI-RS configuration information includes information regarding a slot in which the high-density CSI-RS is present;
receiving downlink control information including information indicating a transmission of an aperiodic CSI-RS; and
based on the transmission of the aperiodic CSI-RS occurring in the slot indicated by the high-density CSI-RS configuration information, receiving the high-density CSI-RS as the periodic CSI-RS.
8. The UE of claim 7 , wherein the UE further performs frequency tracking using the high-density CSI-RS and the high-density CSI-RS has a higher density in a time domain than the low-density CSI-RS.
9. The UE of claim 7 , wherein the high-density CSI-RS is a periodic CSI-RS.
10. A base station (BS) for transmitting a reference signal in a wireless communication system, the BS comprising:
a radio frequency (RF)transceiver;
a processor; and
a memory storing at least one program that causes the processor to perform operations comprising:
transmitting low-density configuration information regarding a low-density channel state information reference signal (CSI-RS) for beam management and high-density configuration information regarding a high-density CSI-RS for time tracking,
wherein the high-density CSI-RS has a higher density at least in a frequency domain than the low-density CSI-RS, and
wherein the high-density CSI-RS configuration information includes information regarding a slot in which the high-density CSI-RS is present;
transmitting downlink control information including information indicating a transmission of an aperiodic CSI-RS; and
based on the transmission of the aperiodic CSI-RS occurring in the slot indicated by the high-density CSI-RS configuration information, transmitting the high-density CSI-RS as the periodic CSI-RS.
11. The BS of claim 10 , wherein the high-density CSI-RS has a higher density in a time domain than the low-density CSI-RS.
12. The BS of claim 10 , wherein the high-density CSI-RS is a periodic CSI-RS.