Radio frequency exposure compliance

Patent metadata

Field	Value
Publication number	US-12500620-B2
Application number	US-202217952166-A
Country	US
Kind code	B2
Filing date	Sep 23, 2022
Priority date	Sep 23, 2022
Publication date	Dec 16, 2025
Grant date	Dec 16, 2025

Abstract

In certain aspects, a method for wireless communication includes transmitting a first transmission with a first transmitter operable according to a first radio technology, and transmitting a second transmission with a second transmitter after completion of the first transmission, the second transmitter operable according to a second radio technology. The method may also include delaying transmission of the second transmission by a predetermined wait time after completion of the first transmission if the first radio technology is a radio frequency (RF) exposure time-averaged technology and the second radio technology is a non-time-averaged RF exposure technology. The method may also include transmitting the second transmission with a limited peak power for a predetermined time period for at least a portion of the second transmission if the first radio technology is a non-time-averaged RF exposure technology and the second radio technology is a time-averaged RF exposure technology.

First claim

What is claimed is:

1 . A wireless device, comprising:
multiple transmitters including a first transmitter and a second transmitter, wherein each of the multiple transmitters is configured to transmit signals according to a respective radio technology of multiple radio technologies, and wherein the multiple radio technologies include a first radio technology comprising a time-averaged radio frequency (RF) exposure technology and a second radio technology comprising a non-time-averaged RF exposure technology; and a processor coupled to the multiple transmitters, wherein the processor is configured to:
cause the first transmitter to transmit a first transmission;
cause the second transmitter to transmit a second transmission after completion of the first transmission;
cause the second transmitter to transmit the second transmission subsequent to completion of a predetermined wait time after the completion of the first transmission if the first transmitter is operable according to the first radio technology and the second transmitter is operable according to the second radio technology; and
cause the second transmitter to transmit at least a portion of the second transmission with a limited peak power for a predetermined time period after the completion of the first transmission if the first transmitter is operable according to the second radio technology and the second transmitter is operable according to the first radio technology,
wherein the wireless device is configured to cause all transmissions according to the second radio technology to be at or below a specific absorption rate (SAR) limit specified by a regulator for averaging RF exposure for the second radio technology.

2 . The wireless device of claim 1 , wherein the processor is further configured to determine the predetermined wait time based on an amount of RF exposure resulting from the first transmission by the first transmitter.

3 . The wireless device of claim 1 , wherein the processor is further configured to determine the predetermined time period based on an amount of RF exposure resulting from the first transmission by the first transmitter.

4 . The wireless device of claim 1 , wherein the processor is configured to cause the second transmitter to transmit according the first radio technology at normal power levels determined by time-averaging after expiration of the predetermined time period.

5 . The wireless device of claim 1 , wherein the first radio technology comprises one or more of wireless wide area network (WWAN) technologies and 5G new radio (NR) technologies and the second radio technology comprises one or more of wireless local area network (WLAN) technologies and Bluetooth technologies.

6 . The wireless device of claim 1 , wherein the processor is further configured to:
receive information concerning on and off states of a transmitter operable according to the second radio technology; and set transmit power limits for one or more transmitters operable according to the first radio technology based on the information concerning the on and off states of the transmitter operable according to the second radio technology.

7 . The wireless device of claim 6 , wherein the processor is further configured to:
determine a history of the transmitter operable according to the second radio technology based on the received information concerning the on and off states of the transmitter operable according to the second radio technology; and adjust at least one of the transmit power levels and the predetermined time period for the one or more transmitters operable according to the first radio technology based on the determined history.

8 . A method for wireless communications, comprising:
transmitting a first transmission with a first transmitter operable according to a first radio technology; transmitting a second transmission with a second transmitter after completion of the first transmission, the second transmitter operable according to a second radio technology; delaying transmission of the second transmission by a predetermined wait time after completion of the first transmission if the first radio technology is a radio frequency (RF) exposure time-averaged technology and the second radio technology is a non-time-averaged RF exposure technology; and transmitting the second transmission with a limited peak power for a predetermined time period for at least a portion of the second transmission if the first radio technology is a non-time-averaged RF exposure technology and the second radio technology is a time-averaged RF exposure technology, wherein transmissions according to the second radio technology are always at or below a specific absorption rate (SAR) limit specified by a regulator for averaging RF exposure for the second radio technology.

9 . The method of claim 8 , further comprising determining the predetermined wait time based on an amount of RF exposure resulting from the first transmission by the first transmitter when the first radio technology comprises the time-averaged RF exposure technology.

10 . The method of claim 8 , further comprising determining the predetermined time period based on an amount of RF exposure resulting from the first transmission by the first transmitter when the first radio technology comprises the non-time-averaged RF exposure technology.

11 . The method of claim 8 , further comprising transmitting at least a portion of the second transmission with the second transmitter when the second radio technology is the time-averaged RF exposure technology at normal power levels as determined by time-averaging after expiration of the predetermined time period.

12 . The method of claim 8 , wherein the time-averaged RF exposure technology comprises one or more of wireless wide area network (WWAN) technologies and 5G new radio (NR) technologies and the non-time-averaged RF exposure technology comprises one or more of wireless local area network (WLAN) technologies and Bluetooth technologies.

13 . The method of claim 8 , further comprising:
receiving information concerning on and off states of a transmitter operable according to the non-time-averaged RF exposure technology; and setting transmit power limits for one or more transmitters operable according to the time-averaged RF exposure technology based on the information concerning the on and off states of the transmitter operable according to the non-time-averaged RF exposure technology.

14 . The method of claim 13 , further comprising:
determining a history of the transmitter operable according the non-time-averaged RF exposure technology based on the received information concerning the on and off states of the transmitter operable according to the second radio technology; and adjusting at least one of the transmit power levels and the predetermined time period for transmitters operable according to the time-averaged RF exposure technology based on the determined history.

15 . A wireless device, comprising:
multiple transmitters, wherein each of the multiple transmitters is configured to transmit signals according to a respective radio technology of multiple radio technologies, and wherein the multiple radio technologies include a time-averaged radio frequency (RF) exposure technology and a non-time-averaged RF exposure technology; and a processor coupled to the multiple transmitters, wherein the processor is configured to:
set a transmission level limit of the non-time-averaged RF exposure technology to a predetermined back-off level during periods when the time-averaged RF exposure technology is active over a transmiss

Assignees

• Qualcomm Inc

Inventors

• Nadakuduti Jagadish
• Lu Lin
• Guckian Paul

Classifications

• H04W52/288

  taking into account the usage mode, e.g. hands-free, data transmission or telephone · CPC title

• H04W88/06

  adapted for operation in multiple networks {or having at least two operational modes}, e.g. multi-mode terminals · CPC title

• H04W52/28

  using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non-transmission · CPC title

• H04W72/1215

  for collaboration of different radio technologies · CPC title

• H04W52/367 Primary

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