Transmitting overlapping uplink transmissions using a power scaling factor
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit, to a network node, a first uplink transmission using a first transmit power that is based at least in part on: a first power level associated with the first uplink transmission, and a power scaling factor based at least in part on a power offset. The UE may transmit, to the network node, a second uplink transmission, at least partially overlapping in time with the first uplink transmission, using a second transmit power that is based at least in part on: a second power level associated with the second uplink transmission, a maximum available transmit power, and the first transmit power. Numerous other aspects are described.
1. An apparatus for wireless communication at a user equipment (UE), comprising:
one or more memories; and
one or more processors coupled to the one or more memories, the one or more processors individually or collectively configured to:
transmit, to a network node at a first time, a first uplink transmission using a first transmit power that is based at least in part on:
a first power level associated with the first uplink transmission, and
a power scaling factor based at least in part on a power offset applied to a second uplink transmission overlapping with the first uplink transmission at the first time; and
transmit, to the network node at the first time, the second uplink transmission using a second transmit power that is based at least in part on:
a second power level associated with the second uplink transmission,
a maximum available transmit power,
the power scaling factor, and
the first transmit power.
2. The apparatus of claim 1 , wherein a total of the first power level and the second power level exceeds the maximum available transmit power, and wherein the total of the first power level and the second power level is scaled to obtain the first transmit power associated with the first uplink transmission and the second transmit power associated with the second uplink transmission.
3. The apparatus of claim 1 , wherein:
the maximum available transmit power for the UE corresponds to a total available power for the UE across frequencies over a frequency range;
the maximum available transmit power for the UE corresponds to a total available power for the UE across carriers over a frequency band; or
the maximum available transmit power for the UE corresponds to a total available power for the UE across a group of frequency bands.
4. The apparatus of claim 1 , wherein the one or more processors are further configured to:
receive, from the network node, an indication of the power offset, via radio resource control signaling, a medium access control control element, or downlink control information.
5. The apparatus of claim 1 , wherein the power scaling factor is based at least in part on the first power level, the power offset, the second power level, and the maximum available transmit power.
6. The apparatus of claim 1 , wherein the first transmit power is based at least in part on a minimum of: the first power level, and a product of the power scaling factor and the first power level.
7. The apparatus of claim 1 , wherein the second transmit power is based at least in part on a minimum of: the second power level, and a difference between the maximum available transmit power and the first transmit power.
8. The apparatus of claim 1 , wherein a temporary power level is based at least in part on a minimum of: the second power level, and a product of the power offset and the first power level, and wherein the power scaling factor is based at least in part on the first power level, the temporary power level, and the maximum available transmit power.
9. The apparatus of claim 1 , wherein a temporary power level is based at least in part on a minimum of: the second power level, and a product of the power offset and a maximum available power for the second uplink transmission, and wherein the power scaling factor is based at least in part on the first power level, the temporary power level, and the maximum available transmit power.
10. The apparatus of claim 1 , wherein the first uplink transmission is associated with a first uplink carrier and the second uplink transmission is associated with a second uplink carrier, wherein the one or more processors are further configured to:
receive, from the network node, a configuration of the power offset for the second uplink carrier, wherein the power offset is applied to the second uplink transmission associated with the second uplink carrier irrespective of a power allocation priority between the second uplink transmission and the first uplink transmission.
11. The apparatus of claim 1 , wherein the one or more processors are further individually or collectively configured to:
receive, from the network node, a configuration of the power offset for an uplink carrier aggregation, wherein the power offset is applied to the second uplink transmission based at least in part on a power allocation priority between the first uplink transmission and the second uplink transmission.
12. The apparatus of claim 11 , wherein the power allocation priority indicates an equal priority level between the first uplink transmission and the second uplink transmission, and wherein the power offset is applied to the second uplink transmission based at least in part on a first index associated with the first uplink transmission and a second index associated with the second uplink transmission.
13. The apparatus of claim 11 , wherein the power allocation priority indicates an equal priority level between the first uplink transmission and the second uplink transmission, and wherein a smaller power offset is applied as compared to power offsets applied to uplink transmissions associated with different priority levels.
14. The apparatus of claim 1 , wherein a first transmission time interval (TTI) associated with the first uplink transmission is not aligned with a second TTI associated with the second uplink transmission, wherein the power offset is applied to the second uplink transmission at a symbol level based at least in part on a (pre)-configuration, and wherein a power scaling changes during the second uplink transmission based at least in part on a power allocation priority.
15. The apparatus of claim 1 , wherein a first transmission time interval (TTI) associated with the first uplink transmission is not aligned with a second TTI associated with the second uplink transmission, wherein the power offset is applied to the second uplink transmission at a slot level or at a subframe level based at least in part on a (pre)-configuration, and wherein a power scaling is fixed during a slot or subframe.
16. The apparatus of claim 1 , wherein, based at least in part on a plurality of uplink transmissions including the first uplink transmission and the second uplink transmission, the power scaling factor is based at least in part on the first power level, the power offset multiplied by each of a plurality of power levels associated with the plurality of uplink transmissions, and the maximum available transmit power.
17. The apparatus of claim 1 , wherein, based at least in part on a plurality of uplink transmissions including the first uplink transmission and the second uplink transmission, the power scaling factor is based at least in part on the first power level, the power offset multiplied by the first power level for each of the plurality of uplink transmissions, and the maximum available transmit power.
18. The apparatus of claim 1 , wherein, based at least in part on a plurality of uplink transmissions including the first uplink transmission and the second uplink transmission, the power scaling factor is based at least in part on the first power level, the power offset multiplied by each of a plurality of maximum available powers associated with the plurality of uplink transmissions, and the maximum available transmit power.
19. The apparatus of claim 1 , wherein the power offset is not applied to the first uplink transmission based at least in part on one or more of: a priority level associated with the first uplink transmission or a priority level associated with the second uplink transmission, or a first index of a first uplink carrier associated with the first uplink transmission or second index of a second uplink carrier associated with the second uplink transmission.
20. The apparatus of claim 1 , wherein, for a plurality of uplink transmissions including the first uplink transmission and the second uplink transmission, a priority level is determined for each of the plurality of uplink transmissions, wherein the power offset is applied to one or more of the plurality of uplink transmissions, wherein the power offset is based at least in part on a reference uplink transmission from the plurality of uplink transmissions, and wherein the reference uplink transmission is associated with a higher priority level as compared to other uplink transmissions of the plurality of uplink transmissions.
21. An apparatus for wireless communication at a network node, comprising:
one or more memories; and
one or more processors coupled to the one or more memories, the one or more processors individually or collectively configured to:
receive, from a user equipment (UE) at a first time, a first uplink transmission using a first transmit power that is based at least in part on:
a first power level associated with the first uplink transmission, and
a power scaling factor based at least in part on a power offset applied to a second uplink transmission overlapping with the first uplink transmission at the first time; and
receive, from the UE at the first time, the second uplink transmission using a second transmit power that is based at least in part on:
a second power level associated with the second uplink transmission,
a maximum available transmit power,
the power scaling factor, and
the first transmit power.
22. The apparatus of claim 21 , wherein the maximum available transmit power for the UE corresponds to a total available power for the UE across frequencies over a frequency range.
23. The apparatus of claim 21 , wherein the maximum available transmit power for the UE corresponds to a total available power for the UE across carriers over a frequency band.
24. The apparatus of claim 21 , wherein the maximum available transmit power for the UE corresponds to a total available power for the UE across a group of frequency bands.
25. The apparatus of claim 21 , wherein the one or more processors are further individually or collectively configured to:
transmit, to the UE, an indication of the power offset, via radio resource control signaling, a medium access control control element, or downlink control information.
26. The apparatus of claim 21 , wherein the power scaling factor is based at least in part on the first power level, the power offset, the second power level, and the maximum available transmit power.
27. The apparatus of claim 21 , wherein:
the first transmit power is based at least in part on a minimum of: the first power level, and a product of the power scaling factor and the first power level; and
the second transmit power is based at least in part on a minimum of: the second power level, and a difference between the maximum available transmit power and the first transmit power.
28. The apparatus of claim 21 , wherein:
a temporary power level is based at least in part on a minimum of: the second power level, and a product of the power offset and the first power level; and
the power scaling factor is based at least in part on the first power level, the temporary power level, and the maximum available transmit power.
29. A method of wireless communication performed by a user equipment (UE), comprising:
transmitting, to a network node at a first time, a first uplink transmission using a first transmit power that is based at least in part on:
a first power level associated with the first uplink transmission, and
a power scaling factor based at least in part on a power offset applied to a second uplink transmission overlapping with the first uplink transmission at the first time; and
transmitting, to the network node at the first time, the second uplink transmission using a second transmit power that is based at least in part on:
a second power level associated with the second uplink transmission,
a maximum available transmit power,
the power scaling factor, and
the first transmit power.
30. A method of wireless communication performed by a network node, comprising:
receiving, from a user equipment (UE) at a first time, a first uplink transmission using a first transmit power that is based at least in part on:
a first power level associated with the first uplink transmission, and
a power scaling factor based at least in part on a power offset applied to a second uplink transmission overlapping with the first uplink transmission at the first time; and
receiving, from the UE at the first time, the second uplink transmission using a second transmit power that is based at least in part on:
a second power level associated with the second uplink transmission,
a maximum available transmit power,
the power scaling factor, and
the first transmit power.