Systems And Methods To Control Transmit Power And Specific Absorption Rate (SAR) For Wireless Devices

摘要

Systems and methods are provided that may be implemented to utilize multiple sensors to intelligently control RF transmit power and specific absorption rate (SAR) produced from a wireless-enabled information handling system platform in the presence of a detected nearby human body. The disclosed systems and methods may be implemented in one example to avoid the poor performance and user experience that results from a reduction in the information handling system platform radio transmit power when it is not necessary (due to false detection of a human body), or that results when the platform transmit power is reduced too much and/or too quickly when nearby proximity of an actual human body is detected.

主权项

1. An information handling system platform, comprising:
multiple sensors that are each configured to react to a proximity of a human user to the system platform by producing a sensor output signal that is indicative of a proximity distance of the human user to the system platform; one or more antenna elements; at least one transmitter coupled to the one or more antenna elements and configured to transmit radio frequency (RF) signals from each of the antenna elements; and at least one processing device coupled to the transmitter, the processing device being coupled to receive the sensor output signals of the multiple sensors and to determine a real time object proximity detection distance from each of the multiple sensor output signals; where the at least one processing device is further configured to control the transmitter to reduce RF transmit power according to at least one proximity distance sensing profile that defines a relationship between RF transmit power reduction and the determined object proximity detection distance according to the multiple sensor outputs; and where each of the multiple sensors has a different effective range of human body proximity detection distance; where the proximity distance sensing profile includes a relationship between RF transmit power reduction and multiple separate ranges of determined object proximity detection distance that are each assigned to a corresponding one of the multiple sensors; and where the at least one processing device is further configured to:
determine for each given sensor of the multiple sensors if the real time object proximity detection distance determined from the sensor output signal of the given sensor is within the range of determined object proximity detection distance that is assigned to that given sensor,select the sensor output signal of the given sensor if it is determined that the real time object proximity detection distance determined from the sensor output signal of the given sensor is within the range of determined object proximity detection distance that is assigned to that given sensor, andcontrol the transmitter to reduce RF transmit power according to the at least one proximity distance sensing profile as a function of the object proximity detection distance determined based on the sensor output signal of the given sensor and not based on the sensor output signal of any other signal during the time that the real time object proximity detection distance determined from the sensor output signal of the given sensor is within the range of determined object proximity detection distance that is assigned to that given sensor.