Power control for PUCCH transmissions with multiple TRPs
Methods, a remote unit and abase unit are disclosed. According to one embodiment, a method at abase unit, comprising: transmitting, to a remote unit, multiple power control parameters for physical uplink control channel (PUCCH) by higher layers signaling; and transmitting, to the remote unit, a transmit power control (TPC) command with downlink control information (DCI) format 2_2 scrambled by transmit power control-physical uplink control channel-radio network temporary identity (TPC-PUCCH-RNTI), wherein the power control parameters include more than 8 P0 values and more than 4 pathloss reference signals (PL-RSs).
1. A method performed by a base station, the method comprising:
transmitting, to a remote unit, multiple power control parameters for physical uplink control channel (PUCCH) by higher layers signaling; and
transmitting, to the remote unit, a transmit power control (TPC) command with downlink control information (DCI) format 2_2 scrambled by transmit power control-physical uplink control channel-radio network temporary identity (TPC-PUCCH-RNTI), the TPC command comprising:
a first TPC command field associated with a first plurality of PUCCH groups, each PUCCH group of the first plurality of PUCCH groups comprising one or more PUCCH resources; and
a second TPC command field associated with a second plurality of PUCCH groups, the second plurality of PUCCH groups being different from the first plurality of PUCCH groups,
wherein the power control parameters include more than 8 P0 values and more than 4 pathloss reference signals (PL-RSs).
2. The method of claim 1 , further comprising configuring the P0 values and the PL-RSs by configuring one or more P0-sets, each of which contains one or more of the P0 values, and one or more PL-RS sets, each of which contains one or more of the PL-RSs.
3. The method of claim 2 , further comprising:
configuring one or more PUCCH groups each of which contains one or more PUCCH resources transmitted to the same TRP for the remote unit by higher layers signaling,
wherein the first plurality of PUCCH groups and the second plurality of PUCCH groups comprise a first plurality of PUCCH groups and a second plurality of PUCCH groups of the one or more PUCCH groups and each of the one or more PUCCH groups is associated with one of the P0-sets and one of the PL-RS sets.
4. The method of claim 3 , further comprising:
configuring one or more control resource set (CORESET) groups for the remote unit by higher layers signaling,
wherein each of CORESET groups contains one or more CORESETs configured for the same TRP, and
wherein each of the CORESET groups is associated with the one or more PUCCH groups.
5. The method of claim 1 , wherein the first TPC command field and the second TPC command field comprise TPC command fields for the remote unit in a cell.
6. The method of claim 5 , further comprising:
transmitting two or more block number indices in the TPC command to the remote unit, wherein the two or more block number indices are assigned to the remote unit in a cell and each block number index corresponds to one TPC command field of the TPC command fields.
7. The method of claim 1 , wherein the power control parameters include more than 15 P0 values and more than 7 pathloss reference signals (PL-RSs).
8. A base station, comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured cause the base station to:
transmit, to a remote unit, multiple power control parameters for physical uplink control channel (PUCCH) by higher layers signaling; and
transmit, to the remote unit, a transmit power control (TPC) command with downlink control information (DCI) format 2_2 scrambled by transmit power control-physical uplink control channel-radio network temporary identity (TPC-PUCCH-RNTI) the TPC command comprising:
a first TPC command field associated with a first plurality of PUCCH groups, each PUCCH group of the first plurality of PUCCH groups comprising one or more PUCCH resources; and
a second TPC command field associated with a second plurality of PUCCH groups, the second plurality of PUCCH groups being different from the first plurality of PUCCH groups,
wherein the power control parameters include more than 8 P0 values and more than 4 pathloss reference signals (PL-RSs).
9. The base station of claim 8 , wherein the at least one processor is further configured to:
configure one or more P0-sets each of which contains one or more of the P0 values and one or more PL-RS sets each of which contains one or more of the PL-RSs.
10. The base station of claim 9 , wherein the at least one processor is further configured to:
configure one or more PUCCH groups each of which contains one or more PUCCH resources transmitted to the same TRP for the remote unit by higher layers signaling,
wherein the first plurality of PUCCH groups and the second plurality of PUCCH groups comprise a first plurality of PUCCH groups and a second plurality of PUCCH groups of the one or more PUCCH groups and each of the one or more PUCCH groups is associated with one of the P0-sets and one of the PL-RS sets.
11. The base station of claim 9 , wherein the at least one processor is further configured to:
configure one or more control resource set (CORESET) groups for the remote unit by higher layers signaling,
wherein each of CORESET groups contains one or more CORESETs configured for the same TRP,
wherein each of the CORESET groups is associated with one or more PUCCH groups.
12. The base station of claim 11 , wherein the at least one processor is further configured to:
transmit two or more block number indices in the TPC command to the remote unit, wherein the two or more block number indices are assigned to the remote unit in a cell and each block number index corresponds to one TPC command field of the TPC command fields.
13. The base station of claim 8 , wherein the first TPC command field and the second TPC command field comprise TPC command fields for the remote unit in a cell.
14. A user equipment (UE), comprising:
at least one memory; and
at least one processor coupled to with the at least one memory and configured to cause the UE to:
receive multiple power control parameters for physical uplink control channel (PUCCH) from a base station, and
receive a transmit power control (TPC) command with downlink control information (DCI) format 2_2 scrambled by transmit power control-physical uplink control channel-radio network temporary identity (TPC-PUCCH-RNTI) from the base station, the TPC command comprising:
a first TPC command field associated with a first plurality of PUCCH groups, each PUCCH group of the first plurality of PUCCH groups comprising one or more PUCCH resources; and
a second TPC command field associated with a second plurality of PUCCH groups, the second plurality of PUCCH groups being different from the first plurality of PUCCH groups,
wherein the power control parameters include more than 8 P0 values and more than 4 pathloss reference signals (PL-RSs).
15. The UE of claim 14 , wherein one or more P0-sets, each of which contains one or more of the P0 values, and one or more PL-RS sets, each of which contains one or more of the PL-RSs, are configured by higher layers signaling from the base station.
16. The UE of claim 15 , wherein:
one or more PUCCH groups, each of which contains one or more PUCCH resources, are configured by higher layers signaling from the base station;
the first plurality of PUCCH groups and the second plurality of PUCCH groups comprise a first plurality of PUCCH groups and a second plurality of PUCCH groups of the one or more PUCCH groups; and
each of the PUCCH groups is associated with one of the P0-sets and one of the PL-RS sets.
17. The UE of claim 16 , wherein the P0 value and PL-RS with the lowest index in a P0-set and a PL-RS-set associated with the PUCCH group are used for the PUCCH resource in the corresponding PUCCH group if a spatial relation for PUCCH is not configured by higher layers signaling from the base station.
18. The UE of claim 16 , wherein the first TPC command field and the second TPC command field comprise TPC command fields for the UE in a cell, wherein each of the TPC command fields is applied to PUCCH resource(s) within the PUCCH group(s) associated with this TPC command field.
19. The UE of claim 15 , wherein one or more control resource set (CORESET) groups are configured by higher layers signaling from the base station, wherein each of CORESET groups contains one or more CORESETs configured for the same TRP, and wherein each of the CORESET groups is associated with one or more PUCCH groups.
20. The UE of claim 19 , wherein a TPC command carried by a DCI transmitted from the CORESET using the lowest CORESET-ID among all the CORESETs configured for this UE will be applied to the PUCCH, if two or more DCI format 2_2 scrambled by TPC-PUCCH-RNTI are received in one slot.