Uplink power control method and user equipment
An uplink power control method and a user equipment (UE) for multiple transmission and reception points (TRPs) is provided. The UE obtains a first uplink transmission power for a first transmission and reception point (TRP) at least based on a first downlink pathloss estimate associated with a first pathloss reference signal (PL-RS) resource index. The UE obtains a second uplink transmission power for a second TRP at least based on a second downlink pathloss estimate associated with a second PL-RS resource index. The UE transmits a first uplink transmission using the first uplink transmission power. The UE transmits a second uplink transmission using the second uplink transmission power.
1 . An uplink power control method executable in a user equipment (UE), comprising:
obtaining a first uplink transmission power for a first transmission and reception point (TRP) at least based on a first downlink pathloss estimate associated with a first pathloss reference signal (PL-RS) resource index; and
obtaining a second uplink transmission power for a second TRP at least based on a second downlink pathloss estimate associated with a second PL-RS resource index,
wherein the first uplink transmission power is obtained further based on a power P0 for the first TRP, and the second uplink transmission power is obtained further based on a power P0 for the second TRP,
wherein when a DCI format of a DCI signal received by the UE includes one open-loop power control parameter set indication field, and a value of the open-loop power control parameter set indication field is ‘1’, the P0 value corresponding to the first TRP is determined according to a first value in a higher layer parameter of a P0 value set of a first P0 value set list, wherein the P0 value set includes a P0 value set index mapped to an SRI value in a first SRI field; and
the P0 value corresponding to the second TRP is determined according to a first value in a higher layer parameter of a P0 value set of a second P0 value set list, wherein the P0 value set includes a P0 value set index mapped to an SRI value in a second SRI field.
2 . The uplink power control method of claim 1 , wherein when a higher layer parameter of a configured UL grant is included in a configured grant configuration, the first PL-RS resource index corresponding to the first TRP is provided by a higher layer parameter of a first PL-RS index in the higher layer parameter of the configured UL grant of the configured grant configuration, and the second PL-RS resource index corresponding to the second TRP is provided by a higher layer parameter of a second PL-RS index in the higher layer parameter of the configured UL grant of the configured grant configuration.
3 . The method of claim 2 , wherein the first PL-RS index and the second PL-RS index are used to indicate dynamic switching between single-TRP based CG PUSCH transmission and multi-TRP based CG PUSCH transmission.
4 . The uplink power control method of claim 1 , wherein when a higher layer parameter of a configured UL grant is included in a configured grant configuration, the first PL-RS resource index corresponding to the first TRP is provided by a higher layer parameter of a first PL-RS index in the higher layer parameter of the configured UL grant of the configured grant configuration, and the second PL-RS resource index is an offset value starting from the first PL-RS resource index.
5 . The uplink power control method of claim 4 , wherein the offset value is preconfigured or configured by a radio resource control (RRC) signal, a medium access control (MAC) control element (CE), or downlink control information (DCI).
6 . The uplink power control method of claim 1 , wherein when a higher layer parameter of a configured UL grant is not included in a configured grant configuration, the first PL-RS resource index corresponding to the first TRP is provided by a higher layer parameter of a first PUSCH PL-RS index that is mapped to a higher layer parameter of a first SRI PUSCH PL-RS index in a higher layer parameter of a first SRI PUSCH mapping list, wherein the first SRI PUSCH PL-RS index is mapped to an SRI of a first SRI field; and
the second PL-RS resource index corresponding to the second TRP is provided by a higher layer parameter of a second PUSCH PL-RS index that is mapped to a higher layer parameter of a second SRI PUSCH PL-RS index in a higher layer parameter of a second SRI PUSCH mapping list, wherein the second SRI PUSCH PL-RS index is mapped to an SRI of a second SRI field.
7 . The uplink power control method of claim 1 , wherein when a higher layer parameter of a configured UL grant is not included in a configured grant configuration, and only one SRI PUSCH mapping list is included in a higher layer parameter of a PUSCH PC information element (IE), the first PL-RS resource index corresponding to the first TRP is provided by a higher layer parameter of a first PUSCH PL-RS index mapped to a higher layer parameter of a first SRI PUSCH PC index being equal to 0, and the second PL-RS resource index corresponding to the second TRP is provided by a higher layer parameter of a second PUSCH PL-RS index mapped to a higher layer parameter of a second SRI PUSCH PC index being equal to 1.
8 . The uplink power control method of claim 1 , wherein when a higher layer parameter of a configured UL grant is not included in a configured grant configuration, and DCI does not include an SRI field, and two SRI PUSCH mapping lists are included in a higher layer, the first PL-RS resource index corresponding to the first TRP is provided by a higher layer parameter of a first PUSCH PL-RS index mapped to a higher layer parameter of a first SRI PUSCH PC index being equal to 0 in a higher layer parameter of a first SRI PUSCH mapping list and the second PL-RS resource index corresponding to the second TRP is provided by a higher layer parameter of a second PUSCH PL-RS index mapped to a higher layer parameter of a second SRI PUSCH PC index being equal to 0 in a higher layer parameter of a second SRI PUSCH mapping list.
9 . The uplink power control method of claim 1 , wherein the first PUSCH PL-RS resource index corresponding to the first TRP is the same as a PL-RS for an SRS resource set indicated by an SRI of a first SRI field, wherein the SRS resource set includes an SRS resource associated with PUSCH transmission targeting the first TRP, and the second PUSCH PL-RS resource index corresponding to the second TRP is the same as a PL-RS for an SRS resource set indicated by an SRI of a second SRI field, wherein the SRS resource set includes an SRS resource associated with the PUSCH transmission targeting the second TRP.
10 . The uplink power control method of claim 1 , wherein the first PUSCH PL-RS resource index corresponding to the first TRP is the same as a PL-RS for an SRS resource set with the lowest index, and the second PUSCH PL-RS resource index corresponding to the second TRP is the same as a PL-RS for an SRS resource set with the second lowest index.
11 . The uplink power control method of claim 1 , wherein when DCI does not include an SRI field, the first PUSCH PL-RS resource index corresponding to the first TRP is provided by a higher layer parameter of a first PUSCH PL-RS index mapped to a first SRI PUSCH PC index being equal to 0 in a higher layer parameter of a first SRI PUSCH mapping list, and the second PL-RS resource index q d corresponding to the second TRP is provided by a higher layer parameter of a second PUSCH PL-RS index mapped to a second SRI PUSCH PC index being equal to 0 in a higher layer parameter of a second SRI PUSCH mapping list.
12 . The uplink power control method of claim 1 , wherein the UE transmits PUSCH repetitions toward the first TRP using a first beam or the second TRP using a second beam.
13 . The uplink power control method of claim 1 , wherein when a DCI format of a DCI signal received by the UE does not include an SRI field, and the UE receives two higher layer parameters of a P0 value set list and only one OL PC parameter set indication field, the two P0 values for the first TRP and the second TRP are determined by a higher layer parameter of a P0 alpha value set or a higher layer parameter of a P0 value set of the P0 value set list according to indication in the same OL PC parameter set indication field.
14 . The uplink power control method of claim 13 , wherein when the value of open-loop power control parameter set indication field is ‘0’ or ‘00’, the P0 value corresponding to the first TRP is determined according to a value of a higher layer parameter of a first P0 alpha value set of a P0 alpha value set list, and the P0 value corresponding to the second TRP is determined according to a value of a higher layer parameter of a second P0 alpha value set of the P0 alpha value set list.
15 . The uplink power control method of claim 14 , wherein when the value of open-loop power control parameter set indication field is ‘1’ or ‘01’, the P0 value corresponding to the first TRP is determined according to a first value in the higher layer parameter of the P0 value set with the lowest P0 value set index in a first P0 value set list, and the P0 value corresponding to the second TRP is determined according to the first value in the higher layer parameter of the P0 value set with the lowest P0 value set index in a second P0 value set list.
16 . The uplink power control method of claim 15 , wherein when the value of open-loop power control parameter set indication field is ‘10’, the P0 value corresponding to the first TRP is determined according to a second value in the higher layer parameter of the P0 value set with the lowest P0 value set index in the first P0 value set list, and the P0 value corresponding to the second TRP is determined according to the second value in the higher layer parameter of the P0 value set with the lowest P0 value set index in the second P0 value set list.
17 . A chip, comprising:
a processor, configured to call and run a computer program stored in a memory, to cause a device in which the chip is installed to execute any of the methods of claim 1 .
18 . A user equipment (UE), comprising:
a processer; and
a transceiver;
wherein the processor obtains a first uplink transmission power for a first transmission and reception point (TRP) at least based on a first downlink pathloss estimate associated with a first pathloss reference signal (PL-RS) resource index;
the processor obtains a second uplink transmission power for a second TRP at least based on a second downlink pathloss estimate associated with a second PL-RS resource index;
the processor directs the transceiver to transmit a first uplink transmission using the first uplink transmission power; and
the processor directs the transceiver to transmit a second uplink transmission using the second uplink transmission power,
wherein the first uplink transmission power is obtained further based on a power P0 for the first TRP, and the second uplink transmission power is obtained further based on a power P0 for the second TRP,
wherein when a DCI format of a DCI signal received by the UE includes one open-loop power control parameter set indication field, and a value of the open-loop power control parameter set indication field is ‘1’, the P0 value corresponding to the first TRP is determined according to a first value in a higher layer parameter of a P0 value set of a first P0 value set list, wherein the P0 value set includes a P0 value set index mapped to an SRI value in a first SRI field; and
the P0 value corresponding to the second TRP is determined according to a first value in a higher layer parameter of a P0 value set of a second P0 value set list, wherein the P0 value set includes a P0 value set index mapped to an SRI value in a second SRI field.