Power control for uplink transmissions towards multiple TRPs
Systems and methods for enabling power control of multiple Transmission Reception Points (TRPs) are provided. In some embodiments, the wireless device performs at least one of: receiving in a Downlink Control Information (DCI) a first Transmit Power Control (TPC) command and a second TPC command and an indication of a first transmission of the physical channel to a first TRP associated with a first closed-loop and a second transmission of the physical channel to a second TRP associated with a second closed-loop; determining a first and a second transmit power based on the first and the second TPC commands, respectively; and applying the first and the second transmit power to the first UL transmission and the second UL transmission, respectively. In this way, some embodiments herein enable more accurate per TRP power control with a simple signaling for multiple UL transmissions towards different TRPs scheduled by a single DCI.
1 . A method performed by a wireless device for enabling per Transmission Reception Point, TRP, Uplink, UL, power control for a UL physical channel to be transmitted to multiple TRPs, the method comprising:
receiving in a Downlink Control Information, DCI, a first Transmit Power Control, TPC, command and a second TPC command and an indication of a first transmission of the physical channel to a first TRP associated with a first closed-loop and a second transmission of the physical channel to a second TRP associated with a second closed-loop;
determining a first transmit power and a second transmit power based on the first and the second TPC commands, respectively;
applying the first transmit power and the second transmit power to the first UL transmission and the second UL transmission, respectively;
calculating a first and a second Power Headrooms, PHs, based on the first and the second transmit powers, respectively; and
reporting one of the first PH, the second PH, the maximum of the first and the second PHs, the minimum of the first and the second PHs, an average of the first and the second PHs, and both the first and the second PHs in a Power Headroom Report, PHR, carried in the first and the second UL transmissions.
2 . The method of claim 1 wherein the physical channel can be one of a Physical Uplink Shared Channel, PUSCH, and a Physical Uplink Control Channel, PUCCH.
3 . The method of claim 1 wherein the first and second TPC commands indicate power adjustments associated with the first and second closed-loops, respectively.
4 . The method of claim 1 wherein each of the first and second TRPs is identified by a spatial relation, a Sounding Reference Signal, SRS, Resource Indicator, SRI, or a Transmission Configuration Indicator, TCI, state.
5 . The method of claim 1 wherein the DCI is a DL DCI scheduling a Physical Downlink Shared Channel, PDSCH, and the DCI also indicates a PUCCH resource for carrying a Hybrid Automatic Repeat Request Acknowledgment, HARQ-ACK, associated with the PDSCH, where the PUCCH resource is activated with a first and a second spatial relations.
6 . The method of claim 1 wherein the first and second spatial relations are associated with the first and second TRPs, respectively, and the first and second transmissions are PUCCH transmissions.
7 . The method of claim 1 wherein the first and second closed-loop indices are indicated in the first and second spatial relations, respectively.
8 . The method of claim 1 wherein the DCI is a UL DCI scheduling a PUSCH and the first and a second transmissions are PUSCH transmissions.
9 . The method of claim 1 wherein the UL DCI comprises a first and second SRIs, associated with the first and second TRPs, respectively.
10 . The method of claim 1 wherein the first and second closed-loop indices are indicated through the first and second SRIs, respectively.
11 . The method of claim 1 wherein the first and the second spatial relations are associated with a first and a second DL or UL reference signals.
12 . The method of claim 11 wherein the first and the second DL or UL reference signals are one of a CSI-RS, SSB, or SRS.
13 . The method of claim 11 wherein the first and the second DL or UL reference signals are different.
14 . The method of claim 1 wherein the DCI is a DL DCI of one of DCI format 1_1 or DCI format 1_2.
15 . The method of claim 1 wherein the first and the second UL transmissions are respectively a first and a second PUCCH transmissions.
16 . The method of claim 1 wherein the first and the second spatial relations are associated with one or more PUCCH resources.
17 . The method of claim 1 wherein the DCI is a UL DCI of one of DCI format 0_1 or DCI format 0_2.
18 . The method of claim 1 wherein the first and the second UL transmissions are respectively a first and a second PUSCH transmissions.
19 . The method of claim 1 wherein the first and the second spatial relations are associated with respectively a first and a second SRIs indicated in the DCI.
20 . The method of claim 1 wherein the first and the second transmissions are associated with respectively a first and a second UL TCI states indicated in the DCI.
21 . The method of claim 1 wherein the first and the second transmissions are associated with a first and a second sets of power control parameters, respectively.
22 . The method of claim 1 wherein the first and second sets of power control parameters are configured for the first and second spatial relations, SRIs, or TCI states, respectively.
23 . A method performed by a base station for enabling per Transmission Reception Point, TRP, uplink, UL, power control of a UL physical channel to be transmitted towards multiple TRPs by a wireless device, the method comprising:
transmitting, to the wireless device, a configuration of a first and a second power control closed-loops associated with a first and a second TRPs, respectively;
transmitting, to the wireless device, in a DCI a first Transmit Power Control, TPC, command and a second TPC command and an indication of a first UL transmission of the physical channel to the first TRP and a second UL transmission of the physical channel to the second TRP, respectively;
receiving the first UL transmission with a first transmit power at the first TRP and the second UL transmission with a second transmit power at the second TRP; and
receiving one of a first Power Headroom, PH, calculated based on the first transmit power, a second PH calculated based on the second transmit power, the maximum of the first and the second PHs, the minimum of the first and the second PHs, an average of the first and the second PHs, and both the first and the second PHs in a Power Headroom Report, PHR, carried in the first and the second UL transmissions.
24 . A wireless device for enabling power control of multiple Transmission Reception Points, TRPs, comprising:
one or more transmitters;
one or more receivers; and
processing circuitry associated with the one or more transmitters and the one or more receivers, the processing circuitry configured to cause the wireless device to:
receive in a Downlink Control Information, DCI, a first Transmit Power Control, TPC, command and a second TPC command and an indication of a first Uplink, UL, transmission of the physical channel to a first TRP associated with a first closed-loop and a second UL transmission of the physical channel to a first TRP associated with a first closed-loop;
determine a first transmit power and a second transmit power based on the first and the second TPC commands, respectively;
apply the first transmit power and the second transmit power to the first UL transmission and the second UL transmission, respectively;
calculate a first and a second Power Headrooms, PHs, based on the first and the second transmit powers, respectively; and
report one of the first PH, the second PH, the maximum of the first and the second PHs, the minimum of the first and the second PHs, an average of the first and the second PHs, and both the first and the second PHs in a Power Headroom Report, PHR, carried in the first and the second UL transmissions.
25 . A base station for enabling per Transmission Reception Point, TRP, uplink, UL, power control for a UL physical channel to be transmitted to multiple TRPs, comprising:
one or more transmitters;
one or more receivers; and
processing circuitry associated with the one or more transmitters and the one or more receivers, the processing circuitry configured to cause the base station to:
transmitting, to the wireless device, a configuration of a first and a second power control closed-loops for the physical channel, wherein the first and second power control closed-loops are associated with a first and a second TRPs, respectively;
transmit, to the wireless device, in a DCI a first Transmit Power Control, TPC, command and a second TPC command and an indication of a first UL transmission of the physical channel to the first TRP and a second UL transmission of the physical channel to the second TRP, respectively;
receive the first UL transmission at the first TRP with a first transmit power and the second UL transmission at the second TRP with a second transmit power; and
receive one of a first Power Headroom, PH, calculated based on the first transmit power, a second PH calculated based on the second transmit power, the maximum of the first and the second PHs, the minimum of the first and the second PHs, an average of the first and the second PHs, and both the first and the second PHs in a Power Headroom Report, PHR, carried in the first and the second UL transmissions.