Method and device for SRS transmission

1. A method for Sounding Reference Signal (SRS) transmission, comprising:

receiving, by User Equipment (UE), high-layer signaling, wherein the high-layer signaling is used for setting at least one SRS parameter configuration respectively for each of a plurality of uplink BWPs of the UE;

determining, by the UE, an active uplink Bandwidth Part (BWP) among the plurality of uplink BWPs;

determining, by the UE, an SRS parameter configuration corresponding to the active uplink BWP according to the high-layer signaling, wherein the SRS parameter configuration corresponding to the active uplink BWP comprises a configuration of at least one SRS resource set in the active uplink BWP and a configuration of at least one SRS resource in the active uplink BWP; and

transmitting, by the UE, an SRS in the active uplink BWP according to the SRS parameter configuration.

2. The method of claim 1 , wherein determining, by the UE, the active uplink BWP comprises:

determining, by the UE, the active uplink BWP according to BWP indication information, wherein latest received Downlink Control Information (DCI) for scheduling uplink transmission comprises the BWP indication information.

3. The method of claim 1 , wherein the configuration of the at least one SRS resource set comprises at least one of a power control parameter configuration of the at least one SRS resource set, a usage configuration of the at least one SRS resource set, an aperiodic triggering state corresponding to the at least one SRS resource set, or a Channel State Information Reference Signal (CSI-RS) configuration associated with the at least one SRS resource set.

4. The method of claim 3 , wherein the SRS parameter configuration comprises the power control parameter configuration of the at least one SRS resource set; and transmitting, by the UE, the SRS in the active uplink BWP according to the SRS parameter configuration comprises:

determining, by the UE, transmit power for SRS transmission on the at least one SRS resource set according to the power control parameter configuration of the at least one SRS resource set; and transmitting the SRS in the active uplink BWP according to the determined transmit power.

5. The method of claim 3 , wherein the SRS parameter configuration comprises the usage configuration of the at least one SRS resource set; and transmitting, by the UE, the SRS in the active uplink BWP according to the SRS parameter configuration comprises:

determining, by the UE, an antenna port, a transmission beam or an SRS resource number for SRS transmission on the at least one SRS resource set according to the usage configuration of the at least one SRS resource set, and transmitting the SRS in the active uplink BWP according to the determined antenna port, transmission beam or SRS resource number.

6. The method of claim 3 , wherein the SRS parameter configuration comprises the aperiodic triggering state corresponding to the at least one SRS resource set; and transmitting, by the UE, the SRS in the active uplink BWP according to the SRS parameter configuration comprises:

determining, by the UE, an SRS resource set for aperiodic SRS transmission in the active uplink BWP according to the aperiodic triggering state corresponding to the at least one SRS resource set and the aperiodic SRS triggering signaling, and transmitting the SRS in the active uplink BWP according to the determined SRS resource set.

7. The method of claim 3 , wherein the SRS parameter configuration comprises the CSI-RS resource configuration associated with the at least one SRS resource set; and transmitting, by the UE, the SRS in the active uplink BWP according to the SRS parameter configuration comprises:

determining, by the UE, at least one of a beam or a precoding matrix for SRS transmission on the at least one SRS resource set according to the CSI-RS resource configuration associated with the at least one SRS resource set, and transmitting the SRS in the active uplink BWP according to the determined at least one of beam or precoding matrix.

8. The method of claim 1 , wherein the configuration of the at least one SRS resource comprises at least one of a time-frequency resource configuration of the at least one SRS resource, a sequence configuration of the at least one SRS resource, an antenna port configuration of the at least one SRS resource, a periodicity configuration of the at least one SRS resource, a spatial relation configuration of the at least one SRS resource, or an aperiodic triggering state corresponding to the at least one SRS resource.

9. The method of claim 8 , wherein the SRS parameter configuration comprises a spatial relation parameter of the at least one SRS resource; and transmitting, by the UE, the SRS in the active uplink BWP according to the SRS parameter configuration comprises:

determining, by the UE, a target SRS resource, a CSI-RS resource or a Synchronization Signal Block (SSB) spatially correlated with the at least one SRS resource according to the spatial relation parameter of the at least one SRS resource;

determining, by the UE, a transmission beam of the at least one SRS resource according to the target SRS resource, the CSI-RS resource or the SSB; and

transmitting, by the UE, the SRS in the active uplink BWP according to the determined transmission beam.

10. The method of claim 8 , wherein the SRS parameter configuration comprises the sequence configuration of the at least one SRS resource; and transmitting, by the UE, the SRS in the active uplink BWP according to the SRS parameter configuration comprises:

determining, by the UE, an SRS sequence for SRS transmission on the at least one SRS resource according to the sequence configuration of the at least one SRS resource, and transmitting the SRS in the active uplink BWP according to the determined SRS sequence.

11. The method of claim 8 , wherein the SRS parameter configuration comprises the periodicity configuration of the at least one SRS resource; and transmitting, by the UE, the SRS in the active uplink BWP according to the SRS parameter configuration comprises:

determining, by the UE, a periodicity operation for SRS transmission on the at least one SRS resource according to the periodicity configuration of the at least one SRS resource, and transmitting the SRS in the active uplink BWP according to the determined periodicity operation.

12. User Equipment (UE), comprising:

one or more processors;

memory operatively coupled to the one or more processors, the memory storing one or more programs configured for execution by the one or more processors, the one or more programs comprising instructions for a method for Sounding Reference Signal (SRS) transmission, wherein the method comprising:

receiving high-layer signaling, wherein the high-layer signaling is used for setting at least one SRS parameter configuration respectively for each of a plurality of uplink BWPs of the UE;

determining an active uplink Bandwidth Part (BWP) among the plurality of uplink BWPs;

determining an SRS parameter configuration corresponding to the active uplink BWP according to the high-layer signaling, wherein the SRS parameter configuration comprises a configuration of at least one SRS resource set in the active uplink BWP and a configuration of at least one SRS resource in the active uplink BWP; and

transmitting an SRS in the active uplink BWP according to the SRS parameter configuration.

13. The UE of claim 12 , wherein the one or more programs comprises instructions for the method further comprising:

determining the active uplink BWP according to BWP indication information, wherein latest received Downlink Control Information (DCI) for scheduling uplink transmission comprises the BWP indication information.

14. The UE of claim 12 , wherein the configuration of the at least one SRS resource set comprises at least one of a power control parameter configuration of the at least one SRS resource set, a usage configuration of the at least one SRS resource set, an aperiodic triggering state corresponding to the at least one SRS resource set, or a Channel State Information Reference Signal (CSI-RS) configuration associated with the at least one SRS resource set.

15. The UE of claim 14 , wherein the one or more programs comprises instructions for the method further comprising:

determining transmitted power for SRS transmission on the at least one SRS resource set according to a power control parameter configuration of the at least one SRS resource set; and

transmitting the SRS in the active uplink BWP according to the determined transmitted power.

16. The UE of claim 14 , wherein the one or more programs comprises instructions for the method further comprising:

determining an antenna port, a transmission beam or an SRS resource number for SRS transmission on the at least one SRS resource set according to a usage configuration of the at least one SRS resource set, and

transmitting the SRS in the active uplink BWP according to the determined antenna port, transmission beam or SRS resource number.

17. The UE of claim 14 , wherein the one or more programs comprises instructions for the method further comprising:

determining an SRS resource set for aperiodic SRS transmission in the active uplink BWP according to an aperiodic triggering state corresponding to the at least one SRS resource set and the aperiodic SRS triggering signaling, and

transmitting the SRS in the active uplink BWP according to the determined SRS resource set.

18. The UE of claim 14 , wherein the one or more programs comprises instructions for the method further comprising:

determining at least one of a beam or a precoding matrix for SRS transmission on the at least one SRS resource set according to a CSI-RS resource configuration associated with the at least one SRS resource set, and

transmitting the SRS in the active uplink BWP according to the determined at least one of beam or precoding matrix.

19. The UE of claim 12 , wherein the configuration of the at least one SRS resource comprises at least one of a time-frequency resource configuration of the at least one SRS resource, a sequence configuration of the at least one SRS resource, an antenna port configuration of the at least one SRS resource, a periodicity configuration of the at least one SRS resource, a spatial relation configuration of the at least one SRS resource, or an aperiodic triggering state corresponding to the at least one SRS resource.

20. The UE of claim 19 , wherein the one or more programs comprises instructions for the method further comprising:

determining a target SRS resource, a CSI-RS resource or a Synchronization Signal Block (SSB) spatially correlated with the at least one SRS resource according to a spatial relation parameter of the at least one SRS resource;

determining a transmission beam of the at least one SRS resource according to the target SRS resource, the CSI-RS resource or the SSB; and

transmitting the SRS in the active uplink BWP according to the determined transmission beam.

21. The UE of claim 19 , wherein the one or more programs comprises instructions for the method further comprising:

determining an SRS sequence for SRS transmission on the at least one SRS resource according to the sequence configuration of the at least one SRS resource, and

transmitting the SRS in the active uplink BWP according to the determined SRS sequence.

22. The UE of claim 19 , wherein the one or more programs comprises instructions for the method further comprising:

determining a periodicity operation for SRS transmission on the at least one SRS resource according to the periodicity configuration of the at least one SRS resource, and

transmitting the SRS in the active uplink BWP according to the determined periodicity operation.