Power headroom reporting by wireless transmit/receive unit supporting simultaneous multi-panel transmission
The disclosure pertains to a method implemented in a Wireless Transmit/Receive Unit (WTRU) for multiple Transmission and Reception Points (TRPs) Power Headroom Reports (PHRs). The method includes sending capability information indicating that the WTRU is configured to support simultaneous multi-panel (SMP) transmission. The method additionally includes determining that a power headroom report (PHR) has been triggered, and receiving downlink control information (DCI) comprising uplink grant information, the DCI indicating a multi-panel mode of operation. The method further includes determining one or more PH values for the PHR, wherein the one or more PH values are determined based on at least the multi-panel mode of operation indicated in the DCI and whether the PHR was triggered based on an SMP PL determination. The method also includes sending the PHR comprising the one or more PH values.
1 . A wireless transmit/receive unit (WTRU) comprising a memory and processor, the memory and processor configured to:
send capability information indicating that the WTRU is configured to support simultaneous multi-panel (SMP) transmission;
determine that a power headroom report (PHR) has been triggered;
receive downlink control information (DCI) comprising uplink grant information, the DCI indicating a multi-panel (MP) mode of operation;
determine power headroom (PH) values for the PHR, wherein the PH values comprise a first PH value for a panel associated with a single panel PHR trigger and a second PH value associated with SMP operation, and wherein the PH values are determined based on at least the multi-panel mode of operation indicated in the DCI and whether the PHR was triggered based on an SMP pathloss (PL) determination; and
send the PHR comprising the PH values.
2 . The WTRU of claim 1 , wherein an SMP PL value is determined based on a weighted average of PLs associated with the SMP transmission.
3 . The WTRU of claim 1 , wherein the PHR trigger is based on at least the single panel PHR trigger or a difference between a current SMP PL value and a last SMP PL value being above a threshold.
4 . The WTRU of claim 1 , wherein the MP mode of operation comprises single active panel, dynamic panel selection, and SMP.
5 . The WTRU of claim 1 , wherein the PHR comprising the PH values further comprises a SRS Resource Indicator (SRI) mapping to transport blocks (TBs) and joint reporting of multiple PHRs for multiple PHRs or SRIs.
6 . The WTRU of claim 1 , further configured to trigger rules per reference signal (RS) group for multi-TRP based on at least one of PL, P-MPR, and PL difference between RS groups.
7 . The WTRU of claim 1 , wherein sending the PHR is based on intra- and inter-cell cases, wherein the intra and inter-cell cases comprise: an multiple Transmission and Reception Points (mTRP) mode determination, a single vs multiple PH level reporting, and medium access control-control element (MAC-CE) enhancements.
8 . The WTRU of claim 1 , wherein the PHR is in a simultaneous UL multi-panel (STxMP) transmission to a multiple Transmission and Reception Point (mTRP).
9 . A method performed by a Wireless Transmit/Receive Unit (WTRU), the method comprising:
sending capability information indicating that the WTRU is configured to support simultaneous multi-panel (SMP) transmission;
determining that a power headroom report (PHR) has been triggered;
receiving downlink control information (DCI) comprising uplink grant information, the DCI indicating a multi-panel (MP) mode of operation;
determining power headroom (PH) values for the PHR, wherein the PH values comprise a first PH value for a panel associated with a single panel PHR trigger and a second PH value associated with SMP operation, and wherein the one or more PH values are determined based on at least the multi-panel mode of operation indicated in the DCI and whether the PHR was triggered based on an SMP pathloss (PL) determination; and
sending the PHR comprising the PH values.
10 . The method of claim 9 , wherein an SMP PL value is determined based on a weighted average of PLs associated with the SMP transmission.
11 . The method of claim 9 , wherein the PHR trigger is based on at least a single panel PHR trigger or a difference between a current SMP PL value and a last SMP PL value being above a threshold.
12 . The method of claim 9 , wherein the MP mode of operation comprises single active panel, dynamic panel selection, and SMP.
13 . The method of claim 9 , wherein the PHR comprising the PH values further comprises a SRS Resource Indicator (SRI) mapping to transport blocks (TBs), and joint reporting of multiple PHRs for multiple PHRs or SRIs.
14 . The method of claim 9 , further comprising triggering rules per reference signal (RS) group for multi-TRP based on at least one of PL, P-MPR, and PL difference between RS groups.
15 . The method of claim 9 , wherein sending the PHR is based on intra- and inter-cell cases, wherein the intra and inter-cell cases comprise: an multiple Transmission and Reception Points (mTRP) mode determination, a single vs multiple PH level reporting, and medium access control-control element (MAC-CE) enhancements.