USER EQUIPMENT AND METHOD FOR UPLINK TRANSMISSION

1 . A method performed by a user equipment (UE) for uplink (UL) transmission, the method comprising:

receiving, from a base station (BS), a first Radio Resource Control (RRC) configuration that indicates a first Sounding Reference Signal (SRS) resource set and a second SRS resource set;

receiving, from the BS, Downlink Control Information (DCI) comprising at least a specific field; and

determining whether to apply both or only one of the first SRS resource set and the second SRS resource set during Physical Uplink Shared Channel (PUSCH) transmission according to the specific field.

2 . The method of claim 1 , further comprising:

determining an order in which the first SRS resource set and the second SRS resource set are applied according to the specific field in a case that both of the first SRS resource set and the second SRS resource set are applied during the PUSCH transmission.

3 . The method of claim 1 , wherein:

the first SRS resource set is associated with a first Transmission Reception Point (TRP) of the BS; and

the second SRS resource set is associated with a second TRP of the BS.

4 . The method of claim 1 , wherein the PUSCH transmission is scheduled by the DCI.

5 . The method of claim 1 , wherein Cyclic Redundancy Check (CRC) of the DCI is scrambled by a Configured Scheduling-Radio Network Temporary Identifier (CS-RNTI).

6 . The method of claim 5 , further comprising:

receiving, from the BS, a second RRC configuration that indicates a first power control related parameter associated with the first SRS resource set and a second power control related parameter associated with the second SRS resource set; and

activating the PUSCH transmission along with the second RRC configuration upon reception of the DCI.

7 . The method of claim 1 , wherein a number of first SRS resources in the first SRS resource set is identical to a number of second SRS resources in the second SRS resource set.

8 . The method of claim 1 , wherein:

the DCI further includes a first Transmit Precoding Matrix Index (TPMI) field and a second TPMI field;

the first TPMI field indicates first precoding information when applying the first SRS resource set during the PUSCH transmission; and

the second TPMI field indicates second precoding information when applying the second SRS resource set during the PUSCH transmission.

9 . The method of claim 8 , wherein:

a same number of layers of precoding matrix is applied to the first TPMI field and the second TPMI field; and

first candidate TPMI values corresponding to the first TPMI field and second candidate TPMI values corresponding to the second TPMI field are based on a same TPMI table.

10 . The method of claim 8 , wherein the second TPMI field has fewer bits than the first TPMI field.

11 . A user equipment (UE) for uplink (UL) transmission, the UE comprising:

one or more processors; and

at least one memory coupled to at least one of the one or more processors, wherein the at least one memory stores a computer-executable program that, when executed by the at least one of the one or more processors, causes the UE to:

receive, from a base station (BS), a first Radio Resource Control (RRC) configuration that indicates a first Sounding Reference Signal (SRS) resource set and a second SRS resource set;

receive, from the BS, Downlink Control Information (DCI) comprising at least a specific field; and

determine whether to apply both or only one of the first SRS resource set and the second SRS resource set during Physical Uplink Shared Channel (PUSCH) transmission according to the specific field.

12 . The UE of claim 11 , wherein the at least one processor is further configured to execute the computer-executable instructions to:

determine an order in which the first SRS resource set and the second SRS resource set are applied according to the specific field in a case that both of the first SRS resource set and the second SRS resource set are applied during the PUSCH transmission.

13 . The UE of claim 11 , wherein:

the first SRS resource set is associated with a first Transmission Reception Point (TRP) of the BS; and

the second SRS resource set is associated with a second TRP of the BS.

14 . The UE of claim 11 , wherein the PUSCH is scheduled by the DCI.

15 . The UE of claim 11 , wherein Cyclic Redundancy Check (CRC) of the DCI is scrambled by a Configured Scheduling-Radio Network Temporary Identifier (CS-RNTI).

16 . The UE of claim 15 , wherein the at least one processor is further configured to execute the computer-executable instructions to:

receive, from the BS, a second RRC configuration that indicates a first power control related parameter associated with the first SRS resource set and a second power control related parameter associated with the second SRS resource set; and

activate the PUSCH transmission along with the second RRC configuration upon reception of the DCI.

17 . The UE of claim 11 , wherein a number of first SRS resources in the first SRS resource set is identical to a number of second SRS resources in the second SRS resource set.

18 . The UE of claim 11 , wherein:

the DCI further includes a first Transmit Precoding Matrix Indicator (TPMI) field and a second TPMI field;

the first TPMI field indicates first precoding information when applying the first SRS resource set during the PUSCH transmission; and

the second TPMI field indicates second precoding information when applying the second SRS resource set during the PUSCH transmission.

19 . The UE of claim 18 , wherein:

a same number of layers of precoding matrix is applied to the first TPMI field and the second TPMI field; and

first candidate TPMI values corresponding to the first TPMI field and second candidate TPMI values corresponding to the second TPMI field are based on a same TPMI table.

20 . The UE of claim 18 , wherein the second TPMI field has fewer bits than the first TPMI field.