Power control for multiple transmission reception points
A wireless device receives configuration parameters comprising pathloss reference linking indicators for SRS resource sets of a first cell associated with one or more TRPs, wherein each SRS resource set of the SRS resource sets comprises SRS resources, and each SRS resource set is associated with a respective pathloss reference linking indicator of the pathloss reference linking indicators, indicating a cell index identifying a pathloss reference cell. The wireless device transmits, via SRS resources of a first SRS resource set of the SRS resource sets in the first cell, SRSs with a transmission power determined based on a first pathloss RS of a first pathloss reference cell, wherein the first pathloss reference cell is indicated by a first pathloss reference linking indicator, of the pathloss reference linking indicators, associated with the first SRS resource set.
1. A method comprising:
receiving, by a wireless device, radio resource control (RRC) messages comprising configuration parameters comprising pathloss reference linking indicators for sounding reference signal (SRS) resource sets of a first cell associated with one or more transmission and reception points (TRPs), wherein:
each SRS resource set of the SRS resource sets comprises SRS resources; and
each SRS resource set is associated with a respective pathloss reference linking indicator of the pathloss reference linking indicators, indicating a cell index identifying a pathloss reference cell; and
transmitting, via SRS resources of a first SRS resource set of the SRS resource sets in the first cell, SRSs with a transmission power determined based on a first pathloss RS of a first pathloss reference cell, wherein the first pathloss reference cell is indicated by a first pathloss reference linking indicator, of the pathloss reference linking indicators, associated with the first SRS resource set.
2. The method of claim 1 , wherein the first pathloss reference cell comprises at least one of:
a primary cell;
the first cell; or
a second cell different from the first cell.
3. The method of claim 1 , further comprising receiving a command indicating the transmission of the SRSs of the first SRS resource set.
4. The method of claim 3 , wherein the command comprises at least one of:
an RRC message;
a medium access control control element (MAC CE); or
a downlink control information (DCI).
5. The method of claim 3 , wherein the SRSs are transmitted based on the command comprising an SRS request indicator indicating a first SRS resource set identifier identifying the first SRS resource set.
6. The method of claim 1 , wherein the SRS resource sets comprise:
the first SRS resource set associated with a first control resource set (coreset) pool index identifying a first group of coresets; and
a second SRS resource set associated with a second coreset pool index identifying a second group of coresets.
7. The method of claim 6 , wherein a coreset, of the first group of coresets and the second group of coresets, is associated with first parameters comprising:
a coreset index identifying the coreset; and
a coreset pool index of a group of coresets in which the coreset belongs, wherein the coreset pool index is one of the first coreset pool index and the second coreset pool index.
8. A wireless device comprising:
one or more processors; and
memory storing instructions that, when executed by the one or more processors, cause the wireless device to:
receive radio resource control (RRC) messages comprising configuration parameters comprising pathloss reference linking indicators for sounding reference signal (SRS) resource sets of a first cell associated with one or more transmission and reception points (TRPs), wherein:
each SRS resource set of the SRS resource sets comprises SRS resources; and
each SRS resource set is associated with a respective pathloss reference linking indicator of the pathloss reference linking indicators, indicating a cell index identifying a pathloss reference cell; and
transmit, via SRS resources of a first SRS resource set of the SRS resource sets in the first cell, SRSs with a transmission power determined based on a first pathloss RS of a first pathloss reference cell, wherein the first pathloss reference cell is indicated by a first pathloss reference linking indicator, of the pathloss reference linking indicators, associated with the first SRS resource set.
9. The wireless device of claim 8 , wherein the first pathloss reference cell comprises at least one of:
a primary cell;
the first cell; or
a second cell different from the first cell.
10. The wireless device of claim 8 , wherein the instructions further cause the wireless device to receive a command indicating the transmission of the SRSs of the first SRS resource set.
11. The wireless device of claim 10 , wherein the command comprises at least one of:
an RRC message;
a medium access control control element (MAC CE); or
a downlink control information (DCI).
12. The wireless device of claim 10 , wherein the SRSs are transmitted based on the command comprising an SRS request indicator indicating a first SRS resource set identifier identifying the first SRS resource set.
13. The wireless device of claim 8 , wherein the SRS resource sets comprise:
the first SRS resource set associated with a first control resource set (coreset) pool index identifying a first group of coresets; and
a second SRS resource set associated with a second coreset pool index identifying a second group of coresets.
14. The wireless device of claim 13 , wherein a coreset, of the first group of coresets and the second group of coresets, is associated with first parameters comprising:
a coreset index identifying the coreset; and
a coreset pool index of a group of coresets in which the coreset belongs, wherein the coreset pool index is one of the first coreset pool index and the second coreset pool index.
15. A non-transitory computer-readable medium comprising instructions that, when executed by one or more processors, cause a wireless device to:
receive radio resource control (RRC) messages comprising configuration parameters comprising pathloss reference linking indicators for sounding reference signal (SRS) resource sets of a first cell associated with one or more transmission and reception points (TRPs), wherein:
each SRS resource set of the SRS resource sets comprises SRS resources; and
each SRS resource set is associated with a respective pathloss reference linking indicator of the pathloss reference linking indicators, indicating a cell index identifying a pathloss reference cell; and
transmit, via SRS resources of a first SRS resource set of the SRS resource sets in the first cell, SRSs with a transmission power determined based on a first pathloss RS of a first pathloss reference cell, wherein the first pathloss reference cell is indicated by a first pathloss reference linking indicator, of the pathloss reference linking indicators, associated with the first SRS resource set.
16. The non-transitory computer-readable medium of claim 15 , wherein the first pathloss reference cell comprises at least one of:
a primary cell;
the first cell; or
a second cell different from the first cell.
17. The non-transitory computer-readable medium of claim 15 , wherein the instructions further cause the wireless device to receive a command indicating the transmission of the SRSs of the first SRS resource set.
18. The non-transitory computer-readable medium of claim 17 , wherein the command comprises at least one of:
an RRC message;
a medium access control control element (MAC CE); or
a downlink control information (DCI).
19. The non-transitory computer-readable medium of claim 17 , wherein the SRSs are transmitted based on the command comprising an SRS request indicator indicating a first SRS resource set identifier identifying the first SRS resource set.
20. The non-transitory computer-readable medium of claim 15 , wherein the SRS resource sets comprise:
the first SRS resource set associated with a first control resource set (coreset) pool index identifying a first group of coresets; and
a second SRS resource set associated with a second coreset pool index identifying a second group of coresets.