Methods and devices of transmit power control for multiple transceivers in a single device or in a multiple device scenario
This disclosure presents methods and devices that implement dynamic transmit power control techniques in terminal devices with multiple radio frequency (RF) transmitters and/or in a multi-terminal device environment to comply with regulatory RF exposure limits and standards while enhancing device performance. For example, the present disclosure provides a device including a processor configured to monitor a transmit power for each of a plurality of transmitters; determine a transmit power reduction to be applied to the plurality of transmitters based on a total simultaneous transmit power of the plurality of transmitters exceeding a threshold; define a respective amount of the transmit power reduction to be applied to each transmitter of the plurality of transmitters based on one or more parameters; and apply the respective amount of the transmit power reduction to each transmitter of the plurality of transmitters.
1. A device comprising a processor configured to:
monitor a transmit power for each of a plurality of transmitters;
determine a transmit power reduction to be applied to the plurality of transmitters based on a total simultaneous transmit power of the plurality of transmitters exceeding a threshold;
define a respective amount of the transmit power reduction to be applied to each transmitter of the plurality of transmitters based on one or more parameters; and
apply the respective amount of the transmit power reduction to each transmitter of the plurality of transmitters,
wherein each transmitter of the plurality of transmitters is additionally configured to apply its respective amount of the transmit power reduction to a plurality of time-averaging (TA)-specific absorption rate (SAR) parameters, and
wherein the TA-SAR parameters comprise a lower threshold, a dynamic power reduction (DPR) ON value, and a DPR OFF value for a respective transmitter of the plurality of transmitters.
2. The device of claim 1 , wherein the monitoring of the transmit power for the plurality of transmitter comprises monitoring a requested power for transmissions via each transmitter of the plurality of transmitters.
3. The device of claim 2 , wherein the requested power is based on a system workload or a network traffic information corresponding to each transmitter of the plurality of transmitters.
4. The device of claim 2 , wherein determining the total simultaneous transmit power comprises adding the requested transmit powers for each of the plurality of transmitters that are requested for a same time period.
5. The device of claim 1 , wherein the threshold is a regulatory limit for simultaneous transmission power for the plurality of transmitters.
6. The device of claim 1 , wherein determining the transmit power reduction comprises computing a difference between the total simultaneous transmit power and the threshold.
7. The device of claim 1 , wherein defining the respective amount of the transmit power reduction to be applied to each respective transmitter of the plurality of transmitters comprises defining a first amount for a first transmitter of the plurality of transmitters and defining a second amount for a second transmitter of the plurality of transmitters.
8. The device of claim 1 , wherein the one or more parameters comprise:
a priority of a radio access technology being communicated from each transmitter of the plurality of transmitters.
9. The device of claim 1 , wherein the one or more parameters comprise:
a transmission signal quality value corresponding to each of the plurality of transmitters.
10. The device of claim 1 , wherein the one or more parameters comprise:
a performance metric for transmissions being transmitted from each of the plurality of transmitters; or
a network traffic information or system workload for a radio access technology being communicated via each of the plurality of transmitters.
11. A method comprising:
monitoring a transmit power of each of a plurality of transmitters;
determining a transmit power reduction to be applied to the plurality of transmitters based on a total simultaneous transmit power of the plurality of transmitters exceeding a threshold;
defining a respective amount of the transmit power reduction to be applied to each transmitter of the plurality of transmitters based on one or more parameters; and
applying the respective amount of the transmit power reduction to each transmitter of the plurality of transmitters, comprising applying by each transmitter its respective amount of the transmit power reduction to a plurality of time-averaging (TA)-specific absorption rate (SAR) parameters, and
wherein the TA-SAR parameters comprise a lower threshold, a dynamic power reduction (DPR) ON value, and a DPR OFF value for a respective transmitter of the plurality of transmitters.
12. The method of claim 11 , wherein the monitoring of the transmit power for the plurality of transmitter comprises monitoring a requested power for transmissions via each transmitter of the plurality of transmitters.
13. The method of claim 12 , wherein the requested power is based on a system workload or a network traffic information corresponding to each transmitter of the plurality of transmitters.
14. The method of any one of claim 12 , wherein determining the total simultaneous transmit power comprises adding the requested transmit powers for each of the plurality of transmitters that are requested for a same time period.
15. The method of claim 11 , wherein determining the transmit power reduction comprises computing a difference between the total simultaneous transmit power and the threshold.
16. The method of claim 11 , wherein defining the respective amount of the transmit power reduction to be applied to each respective transmitter of the plurality of transmitters includes defining a first amount for a first transmitter of the plurality of transmitters and defining a second amount for a second transmitter of the plurality of transmitters.
17. The method of claim 11 , where the threshold is a regulatory limit for simultaneous transmission power for the plurality of transmitters.
18. The method of claim 11 , wherein the one or more parameters comprise:
a priority of a radio access technology being communicated from each transmitter of the plurality of transmitters;
a transmission signal quality value corresponding to each of the plurality of transmitters;
a performance metric for transmissions being transmitted from each of the plurality of transmitters; or
a network traffic information or system workload for a radio access technology being communicated via each of the plurality of transmitters.
19. One or more non-transitory computer-readable media storing instructions thereon that, when executed by at least one processor, direct the at least one processor to perform:
monitoring a transmit power of each of a plurality of transmitters;
determining a transmit power reduction to be applied to the plurality of transmitters based on a total simultaneous transmit power of the plurality of transmitters exceeding a threshold;
defining a respective amount of the transmit power reduction to be applied to each transmitter of the plurality of transmitters based on one or more parameters; and
applying the respective amount of the transmit power reduction to each transmitter of the plurality of transmitters, comprising applying by each transmitter its respective amount of the transmit power reduction to a plurality of time-averaging (TA)-specific absorption rate (SAR) parameters, and
wherein the TA-SAR parameters comprise a lower threshold, a dynamic power reduction (DPR) ON value, and a DPR OFF value for a respective transmitter of the plurality of transmitters.
20. The one or more non-transitory computer-readable media of claim 19 , wherein the monitoring of the transmit power for the plurality of transmitter comprises monitoring a requested power for transmissions via each transmitter of the plurality of transmitters.