Energy allocation among multiple radios for radio frequency (RF) exposure compliance

Patent metadata

Field	Value
Publication number	US-12471040-B2
Application number	US-202218061398-A
Country	US
Kind code	B2
Filing date	Dec 2, 2022
Priority date	Dec 5, 2021
Publication date	Nov 11, 2025
Grant date	Nov 11, 2025

Abstract

Certain aspects of the present disclosure provide techniques and apparatus for operating a wireless communication device pursuant to radio frequency (RF) exposure compliance. A method that may be performed by a wireless device includes determining a base reserve and a dynamic reserve for each of a plurality of radios; and transmitting a signal with at least one of the radios at a transmit power determined based at least in part on one or more maximum time-averaged RF exposure limits associated with each of the radios and on the base reserve and the dynamic reserve for each of the radios.

First claim

The invention claimed is:

1 . A method of wireless communication by a wireless device, comprising:
determining a base reserve and a dynamic reserve for each of a plurality of radios; and transmitting a signal with at least one of the radios at a transmit power determined based at least in part on one or more maximum time-averaged radio frequency (RF) exposure limits associated with each of the radios and on the base reserve and the dynamic reserve for each of the radios, the dynamic reserve for each of the radios including a reserve of transmit power dynamically allocated according to one or more criteria for the respective radio.

2 . The method of claim 1 , further comprising obtaining, from each of the radios, a request indicating values for the base reserve and the dynamic reserve for the respective radio, wherein determining the base reserve and the dynamic reserve comprises determining the base reserve and the dynamic reserve for each of the radios based on the requests obtained from the radios.

3 . The method of claim 1 , wherein:
the base reserve for each of the radios is a guaranteed reserve of transmit power for the respective radio regardless of whether the respective radio is operating; and the base reserve for each of the radios is allocated for a full duration of a time window associated with the respective maximum time-averaged RF exposure limits associated with the respective radio.

4 . The method of claim 1 , wherein:
the dynamic reserve for each of the radios is allocated for a full duration of a time window associated with the maximum time-averaged RF exposure limits associated with the respective radio.

5 . The method of claim 4 , wherein the one or more criteria comprise:
one or more radio conditions associated with the respective radio; one or more duty cycles for transmissions associated with the respective radio; or a combination thereof.

6 . The method of claim 5 , wherein the one or more duty cycles comprise a first duty cycle for control signaling and a second duty cycle for user traffic.

7 . The method of claim 1 , wherein transmitting the signal comprises transmitting the signal with the at least one of the radios at the transmit power determined based at least in part on a summation of the dynamic reserve for each of the radios.

8 . The method of claim 1 , further comprising determining a buffer margin for each of the radios, wherein transmitting the signal comprises transmitting the signal with the at least one of the radios at the transmit power determined based at least in part on the maximum time-averaged RF exposure limits associated with each of the radios and on the base reserve, the dynamic reserve, and the buffer margin for each of the radios.

9 . The method of claim 8 , wherein:
the buffer margin for each of the radios comprises a reserve of transmit power dynamically allocated for unexpected transmissions with the respective radio; and the buffer margin for each of the radios is allocated for a portion of a time window associated with the maximum time-averaged RF exposure limits associated with the respective radio.

10 . The method of claim 8 , wherein determining the base reserve, the dynamic reserve, and the buffer margin comprises:
determining a reserve for each of the radios as a greatest value among the base reserve and the dynamic reserve for the respective radio; and adjusting at least one of the dynamic reserve or the buffer margin for one or more of the radios such that a sum of the reserve for each of the radios, the buffer margin for each of the radios, and a past total exposure usage above a past margin is less than a normalized maximum time-averaged RF exposure limit.

11 . The method of claim 10 , wherein adjusting the at least one of the dynamic reserve or the buffer margin comprises adjusting the at least one of the dynamic reserve or the buffer margin for each of the radios based on priorities associated with the radios.

12 . The method of claim 8 , further comprising:
determining a first margin based at least in part on the base reserve, the dynamic reserve, and the buffer margin for each of the radios; allocating a second margin to each of the radios based on the first margin; and determining the transmit power based at least in part on the maximum time-averaged RF exposure limits, the base reserve, the dynamic reserve, the buffer margin, and the second margin for each of the radios.

13 . The method of claim 12 , wherein allocating the second margin comprises:
allocating a portion of the first margin to each of the radios as the second margin for each of the radios; or allocating the second margin based on a total past RF exposure associated with the radios.

14 . The method of claim 1 , wherein the transmit power is determined to be greater than a maximum of the base reserve and the dynamic reserve.

15 . A method of wireless communication by a wireless device, comprising:
determining a base reserve for each of a plurality of radios, wherein the base reserve for each of the radios is a guaranteed reserve of transmit power regardless of whether the respective radio is operating; and transmitting a signal with at least one of the radios at a transmit power determined based at least in part on one or more maximum time-averaged radio frequency (RF) exposure limits associated with each of the radios and on the base reserve for each of the radios.

16 . The method of claim 15 , wherein the base reserve for each of the radios is allocated for a full duration of a time window associated with the maximum time-averaged RF exposure limits associated with the respective radio.

17 . An apparatus for wireless communication by a wireless device, comprising:
memory; and one or more processors coupled to the memory, the one or more processors, individually or collectively, being configured to:
determine a base reserve and a dynamic reserve for each of a plurality of radios, and
control transmission of a signal with at least one of the radios at a transmit power determined based at least in part on one or more maximum time-averaged radio frequency (RF) exposure limits associated with each of the radios and on the base reserve and the dynamic reserve for each of the radios, the dynamic reserve for each of the radios including a reserve of transmit power dynamically allocated according to one or more criteria for the respective radio.

18 . The apparatus of claim 17 , wherein:
the one or more processors, individually or collectively, are further configured to obtain, from each of the radios, a request indicating values for the base reserve and the dynamic reserve for the respective radio; and the one or more processors, individually or collectively, are further configured to determine the base reserve and the dynamic reserve for each of the radios based on the requests obtained from the radios.

19 . The apparatus of claim 17 , wherein:
the base reserve for each of the radios is a guaranteed reserve of transmit power for the respective radio regardless of whether the respective radio is operating; and the base reserve for each of the radios is allocated for a full duration of a time window associated with the maximum time-averaged RF exposure limits associated with the respective radio.

20 . The apparatus of claim 17 , wherein:
the dynamic reserve for each of the radios is allocated for a full duration of a time window associated with the maximum time-averaged RF exposure limits associated with the respect

Assignees

• Qualcomm Inc

Inventors

• Nadakuduti Jagadish
• Lu Lin
• Guckian Paul

Classifications

• H04W52/346

  distributing total power among users or channels · CPC title

• H04W52/367 Primary

  Power values between minimum and maximum limits, e.g. dynamic range · CPC title