Method for transmitting and receiving phase noise compensation reference signal in wireless communication system, and apparatus therefor

1. A method of transmitting and receiving, by a user equipment (UE), a phase noise reference signal in a wireless communication system, the method comprising:

determining a time location of a demodulation reference signal (DM-RS) that is received from a base station for demodulating downlink data; and

receiving, from the base station and based on the determined time location of the DM-RS, the phase noise reference signal on at least one symbol after a symbol of the DM-RS,

wherein the phase noise reference signal is received from the base station using at least one antenna port, such that for a first antenna port, the phase noise reference signal is received on a first frequency, and for a second antenna port, the phase noise reference signal is received on a second frequency different from the first frequency,

wherein the DM-RS is defined by a DM-RS sequence, and

wherein, based on the phase noise reference signal and the DM-RS being received on an identical frequency: the phase noise reference signal is also defined by the DM-RS sequence.

2. The method of claim 1 , wherein based on the DM-RS and the phase noise reference signal being received on different frequencies:

based on the determined time location of the DM-RS, the phase noise reference signal is defined by the DM-RS which is received on a frequency which is closest to a frequency on which the phase noise reference signal is received.

3. The method of claim 1 , wherein for the first antenna port, the phase noise reference signal is received on the first frequency corresponding to a subcarrier index #5, and

wherein for the second antenna port, the phase noise reference signal is received on the second frequency corresponding to a subcarrier index #6.

4. The method of claim 1 , wherein the DM-RS sequence is generated using a Gold sequence.

5. The method of claim 1 , further comprising:

receiving, from the base station, control information related to a transmission of the downlink data from the base station to the UE, wherein the control information comprises at least one of (i) a precoding scheme related to the downlink data, (ii) a number of transmission ranks, or (iii) a modulation and coding scheme (MCS) level,

wherein determining the time location of the DM-RS is based on the received control information.

6. A user equipment (UE) configured to transmit and receive a phase noise reference signal in a wireless communication system, the UE comprising:

a radio frequency (RF) unit;

at least one processor; and

at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed by the at least one processor, perform operations comprising:

determining a time location of a demodulation reference signal (DM-RS) that is received from a base station for demodulating downlink data; and

receiving, through the RF unit from the base station and based on the determined time location of the DM-RS, the phase noise reference signal on at least one symbol after a symbol of the DM-RS,

wherein the phase noise reference signal is received from the base station using at least one antenna port, such that and wherein: for a first antenna port, the phase noise reference signal is received on a first frequency, and for a second antenna port, the phase noise reference signal is received on a second frequency different from the first frequency,

wherein the DM-RS is defined by a DM-RS sequence, and

wherein, based on the phase noise reference signal and the DM-RS being received on an identical frequency: the phase noise reference signal is also defined by the DM-RS sequence.

7. The UE of claim 6 , wherein based on the DM-RS and the phase noise reference signal being received on different frequencies:

based on the determined time location of the DM-RS, the phase noise reference signal is defined by the DM-RS which is received on a frequency which is closest to a frequency on which the phase noise reference signal is received.

8. The UE of claim 6 , wherein for the first antenna port, the phase noise reference signal is received on the first frequency corresponding to a subcarrier index #5, and

wherein for the second antenna port, the phase noise reference signal is received on the second frequency corresponding to a subcarrier index #6.

9. The UE of claim 6 , wherein the operations further comprise:

receiving, from the base station, control information related to a transmission of the downlink data from the base station to the UE, wherein the control information comprises at least one of (i) a precoding scheme related to the downlink data, (ii) a number of transmission ranks, or (iii) a modulation and coding scheme (MCS) level,

wherein determining the time location of the DM-RS is based on the received control information.

10. The UE of claim 6 , wherein the DM-RS sequence is generated using a Gold sequence.

11. A processing apparatus configured to control a user equipment (UE) to transmit and receive a phase noise reference signal in a wireless communication system, the processing apparatus comprising:

at least one processor; and

at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed by the at least one processor, perform operations comprising:

determining a time location of a demodulation reference signal (DM-RS) that is received from a base station for demodulating downlink data; and

receiving, from the base station and based on the determined time location of the DM-RS, the phase noise reference signal on at least one symbol after a symbol of the DM-RS,

wherein the phase noise reference signal is received from the base station using at least one antenna port, such that for a first antenna port, the phase noise reference signal is received on a first frequency, and for a second antenna port, the phase noise reference signal is received on a second frequency different from the first frequency,

wherein the DM-RS is defined by a DM-RS sequence, and

wherein, based on the phase noise reference signal and the DM-RS being received on an identical frequency: the phase noise reference signal is also defined by the DM-RS sequence.

12. The processing apparatus of claim 11 , wherein based on the DM-RS and the phase noise reference signal being received on different frequencies:

based on the determined time location of the DM-RS, the phase noise reference signal is defined by the DM-RS which is received on a frequency which is closest to a frequency on which the phase noise reference signal is received.

13. The processing apparatus of claim 11 , wherein for the first antenna port, the phase noise reference signal is received on the first frequency corresponding to a subcarrier index #5, and

wherein for the second antenna port, the phase noise reference signal is received on the second frequency corresponding to a subcarrier index #6.

14. The processing apparatus of claim 11 , wherein the operations further comprise:

receiving, from the base station, control information related to a transmission of the downlink data from the base station to the UE, wherein the control information comprises at least one of (i) a precoding scheme related to the downlink data, (ii) a number of transmission ranks, or (iii) a modulation and coding scheme (MCS) level,

wherein determining the time location of the DM-RS is based on the received control information.