Method for transmitting SRS in a wireless communication system and apparatus therefor

1. A method for transmitting a sounding reference signal (SRS) in a wireless communication system, the method performed by a user equipment, the method comprising:

receiving, from a base station (BS), resource configuration information for transmitting the SRS;

performing carrier switching from a first component carrier (CC) to a second component carrier,

wherein a subcarrier spacing of the first component carrier is different from a subcarrier spacing of the second component carrier, and

wherein a carrier switching start position in the first component carrier is determined based on (i) a start position of a transmission symbol interval of the SRS and (ii) a carrier switching time; and

transmitting, to the BS, the SRS on the second component carrier based on the resource configuration information.

2. The method of claim 1 , wherein the first component carrier and the second component carrier are carriers having a time division duplexing (TDD) frame structure.

3. The method of claim 2 , wherein a resource for transmitting the SRS is allocated in a subframe where both a subframe of the first component carrier and a subframe of the second component carrier are configured to be used for uplink transmission.

4. The method of claim 1 , wherein a resource for transmitting the SRS is allocated to a specific time resource region of the first component carrier, and

one or more mini-slots are configured in at least one of a front portion or a rear portion of the specific time resource region.

5. The method of claim 4 , wherein the resource configuration information further includes information indicating a time resource position of the one or more mini-slots configured in the first component carrier.

6. The method of claim 4 , wherein when a physical uplink shared channel (PUSCH) demodulation reference signal (DMRS) symbol and the specific time resource region overlap with each other on the first component carrier, the transmission of the SRS is dropped on the second component carrier.

7. The method of claim 6 , wherein the PUSCH DMRS symbol includes an additional DMRS symbol.

8. The method of claim 1 , wherein a carrier switching end position in the first component carrier is determined based on (i) an end position of the transmission symbol interval of the SRS and (ii) the carrier switching time.

9. The method of claim 1 , the subcarrier spacing of the second component carrier is larger than the subcarrier spacing of the second component carrier.

10. A user equipment configured to transmit a sounding reference signal (SRS) in a wireless communication system, the user equipment comprising:

a receiver and a transmitter;

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:

receiving, from a base station (BS) through the receiver, resource configuration information for transmitting the SRS;

performing carrier switching from a first component carrier (CC) to a second component carrier,

wherein a subcarrier spacing of the first component carrier is different from a subcarrier spacing of the second component carrier, and

wherein a carrier switching start position in the first component carrier is determined based on (i) a start position of a transmission symbol interval of the SRS and (ii) a carrier switching time; and

transmitting, through the transmitter, the SRS to the BS on the second component carrier based on the resource configuration information.

11. The user equipment of claim 10 , wherein a resource for transmitting the SRS is allocated to a specific time resource region of the first component carrier, and

one or more mini-slots are configured in at least one of a front portion or a rear portion of the specific time resource region.

12. The user equipment of claim 11 , wherein the resource configuration information further includes information indicating a time resource position of the one or more mini-slots configured in the first component carrier.

13. The user equipment of claim 11 , wherein when a physical uplink shared channel (PUSCH) demodulation reference signal (DMRS) symbol and the specific time resource region overlap with each other on the first component carrier, the transmission of the SRS is dropped on the second component carrier.

14. The user equipment of claim 10 , wherein a carrier switching end position in the first component carrier is determined based on (i) an end position of the transmission symbol interval of the SRS and (ii) the carrier switching time.

15. An apparatus configured to control a user equipment to transmit a sounding reference signal (SRS) in a wireless communication system, the 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:

receiving, from a base station (BS), resource configuration information for transmitting the SRS;

performing carrier switching from a first component carrier (CC) to a second component carrier,

wherein a subcarrier spacing of the first component carrier is different from a subcarrier spacing of the second component carrier, and

wherein a carrier switching start position in the first component carrier is determined based on (i) a start position of a transmission symbol interval of the SRS and (ii) a carrier switching time; and

transmitting the SRS to the BS on the second component carrier based on the resource configuration information.

16. The apparatus of claim 15 , wherein the first component carrier and the second component carrier are carriers having a time division duplexing (TDD) frame structure.

17. The apparatus of claim 15 , wherein a resource for transmitting the SRS is allocated to a specific time resource region of the first component carrier, and

one or more mini-slots are configured in at least one of a front portion or a rear portion of the specific time resource region.

18. The apparatus of claim 17 , wherein the resource configuration information further includes information indicating a time resource position of the one or more mini-slots configured in the first component carrier.

19. The apparatus of claim 17 , wherein when a physical uplink shared channel (PUSCH) demodulation reference signal (DMRS) symbol and the specific time resource region overlap with each other on the first component carrier, the transmission of the SRS is dropped on the second component carrier.

20. The apparatus of claim 19 , wherein the PUSCH DMRS symbol includes an additional DMRS symbol.