User equipment and method for transmitting power headroom report
A method performed by a user equipment (UE) for transmitting a power headroom report (PHR) is provided. The method receives, from a base station (BS), a Radio Resource Control (RRC) configuration including a first RRC parameter that indicates a first operation mode of multiple PHRs. The method transmits, to the BS, a PHR medium access control (MAC) control element (CE) that includes a first power headroom (PH) associated with a first transmission reception point (TRP) and a second PH associated with a second TRP. The first TRP and the second TRP are associated with a serving cell of the BS. The first PH is a first Type-1 PH associated with a first physical uplink shared channel (PUSCH) transmission toward the first TRP. The second PH is a second Type-1 PH associated with a second PUSCH transmission toward the second TRP.
1 . A method performed by a user equipment (UE) for transmitting a power headroom report (PHR), the method comprising:
receiving, from a base station (BS), a Radio Resource Control (RRC) configuration comprising a first RRC parameter and a second RRC parameter; and
transmitting, to the BS, a PHR medium access control (MAC) control element (CE) comprising a first power headroom (PH) associated with a first transmission reception point (TRP) and a second PH associated with a second TRP,
wherein:
the first RRC parameter indicates a first operation mode for a first plurality of PHRs associated with one serving cell of the BS,
the second RRC parameter indicates a second operation mode for a second plurality of PHRs associated with a plurality of serving cells, including the one serving cell of the BS,
the first TRP and the second TRP are associated with the one serving cell of the BS,
the first PH comprises a first Type-1 PH associated with a first physical uplink shared channel (PUSCH) transmission toward the first TRP, and
the second PH comprises a second Type-1 PH associated with a second PUSCH transmission toward the second TRP.
2 . The method of claim 1 , further comprising:
transmitting a first plurality of PUSCH repetitions to the first TRP; and
transmitting a second plurality of PUSCH repetitions to the second TRP,
wherein each of the first plurality of PUSCH repetitions and each of the second plurality of PUSCH repetitions are in different slots.
3 . The method of claim 2 , wherein:
the PHR MAC CE is transmitted in a first slot for the first plurality of PUSCH repetitions,
the first PH is for an actual PUSCH transmission associated with the first TRP, and
the second PH is for a reference PUSCH transmission associated with the second TRP.
4 . The method of claim 1 , wherein:
the RRC configuration further comprises a third RRC parameter related to a triggering condition for the transmission of the PHR MAC CE, and
the third RRC parameter applies to the first TRP and the second TRP.
5 . The method of claim 4 , wherein the third RRC parameter comprises a threshold of channel variation for the first TRP and the second TRP.
6 . The method of claim 4 , wherein the third RRC parameter comprises a prohibit timer for the transmission of the PHR MAC CE.
7 . The method of claim 1 , wherein:
the first TRP is associated with first spatial relation information, and
the second TRP is associated with second spatial relation information.
8 . A user equipment (UE) for transmitting a power headroom report (PHR), the UE comprising:
at least one processor; and
at least one non-transitory machine-readable medium coupled to the at least one processor and storing one or more computer-executable instructions that, when executed by the at least one processor, cause the UE to:
receive, from a base station (BS), a Radio Resource Control (RRC) configuration comprising a first RRC parameter and a second RRC parameter; and
transmit, to the BS, a PHR medium access control (MAC) control element (CE) comprising a first power headroom (PH) associated with a first transmission reception point (TRP) and a second PH associated with a second TRP,
wherein:
the first RRC parameter indicates a first operation mode for a first plurality of PHRs associated with one serving cell of the BS,
the second RRC parameter indicates a second operation mode for a second plurality of PHRs associated with a plurality of serving cells, including the one serving cell of the BS,
the first TRP and the second TRP are associated with the one serving cell of the BS,
the first PH comprises a first Type-1 PH associated with a first physical uplink shared channel (PUSCH) transmission toward the first TRP, and
the second PH comprises a second Type-1 PH associated with a second PUSCH transmission toward the second TRP.
9 . The UE of claim 8 , wherein the one or more computer-executable instructions, when executed by the at least one processor, further cause the UE to:
transmit a first plurality of PUSCH repetitions to the first TRP; and
transmit a second plurality of PUSCH repetitions to the second TRP,
wherein each of the first plurality of PUSCH repetitions and each of the second plurality of PUSCH repetitions are in different slots.
10 . The UE of claim 9 , wherein:
the PHR MAC CE is transmitted in a first slot for the first plurality of PUSCH repetitions,
the first PH is for an actual PUSCH transmission associated with the first TRP, and
the second PH is for a reference PUSCH transmission associated with the second TRP.
11 . The UE of claim 8 , wherein:
the RRC configuration further comprises a third RRC parameter related to a triggering condition for the transmission of the PHR MAC CE, and
the third RRC parameter applies to the first TRP and the second TRP.
12 . The UE of claim 11 , wherein the third RRC parameter comprises a threshold of channel variation for the first TRP and the second TRP.
13 . The UE of claim 11 , wherein the third RRC parameter comprises a prohibit timer for the transmission of the PHR MAC CE.
14 . The UE of claim 8 , wherein:
the first TRP is associated with first spatial relation information, and
the second TRP is associated with second spatial relation information.