Power headroom reporting for dynamic power aggregation

Patent metadata

Field	Value
Publication number	US-12425983-B2
Application number	US-202117542255-A
Country	US
Kind code	B2
Filing date	Dec 3, 2021
Priority date	Dec 3, 2021
Publication date	Sep 23, 2025
Grant date	Sep 23, 2025

Abstract

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive control signaling, such as a control message or radio resource control (RRC) signaling, from a base station indicating a time interval over which to determine available power headroom relative to a transmission power threshold. The UE may calculate the available power headroom relative to the transmission power threshold as a function of UE transmission power during the time interval. The UE may transmit a power headroom report in an uplink transmission to the base station, the power headroom report indicating the calculated available power headroom. The base station may schedule one or more uplink messages at the UE according to the available power headroom.

First claim

What is claimed is:

1. A method for wireless communication at a user equipment (UE), comprising:
receiving control signaling indicating a time interval over which to determine available power headroom relative to a transmission power threshold;
calculating, based at least in part on the control signaling, the available power headroom as a difference between the transmission power threshold and a statistical transmission power value calculated across a plurality of uplink carriers during within the time interval; and
transmitting a power headroom report indicating the calculated available power headroom based at least in part on a condition for transmitting the power headroom report being satisfied, the condition being that the calculated available power headroom satisfies an expected available power headroom threshold indicating additional transmit power is available at the UE.

2. The method of claim 1 , wherein receiving the control signaling comprises:
receiving, via a control channel, a control message scheduling transmission of an uplink channel carrying the power headroom report, wherein the time interval over which the calculated available power headroom is calculated comprises a transmission duration of the control channel.

3. The method of claim 2 , wherein an end in time of the time interval over which the calculated available power headroom is calculated corresponds to an end in time of the control channel.

4. The method of claim 1 , wherein receiving the control signaling comprises:
receiving radio resource control signaling configuring a resource allocation for transmission of an uplink channel carrying the power headroom report, wherein the time interval over which the calculated available power headroom is calculated is offset from the resource allocation by a defined amount of time.

5. The method of claim 4 , wherein an end in time of the time interval over which the calculated available power headroom is calculated corresponds to the defined amount of time.

6. The method of claim 1 , wherein receiving the control signaling comprises:
receiving the control signaling indicating a time period, wherein the power headroom report is transmitted after expiration of the time period.

7. The method of claim 1 , wherein receiving the control signaling comprises:
receiving the control signaling indicating a time period, wherein transmitting the power headroom report is based at least in part on after expiration of the time period, the calculated available power headroom satisfying a specific absorption rate threshold, or both.

8. The method of claim 1 , wherein the statistical transmission power value comprises an average transmission power calculated for the plurality of uplink carriers within the time interval.

9. The method of claim 1 , wherein the time interval is a symbol period, a transmission occasion, a slot, or a combination thereof.

10. The method of claim 1 , wherein the power headroom report indicates a power headroom at a symbol index, a transmission occasion index, a slot index, or a combination thereof, corresponding to the time interval.

11. The method of claim 1 , wherein receiving the control signaling comprises:
receiving the control signaling indicating to calculate the available power headroom for at least one frequency range of a plurality of frequency ranges associated with one or more uplink transmissions by the UE, for at least one frequency band of a plurality of frequency bands associated with the one or more uplink transmissions, for at least one cell group of a plurality of cell groups associated with a network device, or a combination thereof.

12. The method of claim 1 , wherein the power headroom report indicates a current power headroom and the calculated available power headroom.

13. The method of claim 1 , wherein receiving the control signaling comprises:
receiving the control signaling comprising one or more information elements indicating a duration of the time interval, a power headroom reporting time period, a power headroom prohibition time period, or any combination thereof.

14. A method for wireless communication at a network device, comprising:
transmitting, to a user equipment (UE), control signaling indicating a time interval over which to determine a calculated available power headroom, the calculated available power headroom being a difference between a transmission power threshold and a statistical transmission power value calculated across a plurality of uplink carriers within the time interval;
receiving, from the UE, a power headroom report indicating the calculated available power headroom based at least in part on a condition for communicating the power headroom report being satisfied, the condition being that the calculated available power headroom satisfies an expected available power headroom threshold indicating additional transmit power is available at the UE; and
scheduling one or more uplink messages at the UE according to the calculated available power headroom.

15. The method of claim 14 further comprising:
transmitting, via a control channel, a control message scheduling transmission of an uplink channel carrying the power headroom report, wherein the time interval over which the calculated available power headroom is calculated comprises a transmission duration of the control channel.

16. The method of claim 15 , wherein an end in time of the time interval over which the calculated available power headroom is calculated corresponds to an end in time of the control channel.

17. The method of claim 14 further comprising:
transmitting radio resource control signaling configuring a resource allocation for transmission of an uplink channel carrying the power headroom report, wherein the time interval over which the calculated available power headroom is calculated is offset from the resource allocation by a defined amount of time.

18. The method of claim 17 , wherein an end in time of the time interval over which the calculated available power headroom is calculated corresponds to the defined amount of time.

19. The method of claim 14 , wherein transmitting the control signaling comprises:
transmitting the control signaling indicating a time period, wherein the power headroom report is received after expiration of the time period.

20. The method of claim 14 , wherein transmitting the control signaling comprises:
transmitting the control signaling indicating a time period, wherein receiving the power headroom report is based at least in part on after expiration of the time period, the calculated available power headroom satisfying a specific absorption rate threshold, or both.

21. The method of claim 14 , wherein the time interval is a symbol period, a transmission occasion, a slot, or a combination thereof.

22. The method of claim 14 , wherein the power headroom report indicates a power headroom at a symbol index, a transmission occasion index, a slot index, or a combination thereof, corresponding to the time interval.

23. The method of claim 14 , wherein scheduling the one or more uplink messages further comprises:
scheduling a plurality of uplink messages at the UE based at least in part on the calculated available power headroom satisfying a threshold.

24. The method of claim 14 , wherein scheduling the one or more uplink messages further comprises:
scheduling a single uplink message at the UE based at least in part on the calculated available powe

Assignees

• Qualcomm Inc

Inventors

• Takeda Kazuki
• Saha Chiranjib
• Gaal Peter
• Rico Alvarino Alberto
• Chen Wanshi
• Sridharan Gokul

Classifications

• H04W52/146

  Uplink power control · CPC title

• H04W72/535

  based on resource usage policies · CPC title

• H04W52/365 Primary

  Power headroom reporting · CPC title