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

A method of operating an information handling system platform, comprising:

• using multiple sensors of the information handling system platform to detect 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;
• using at least one processing device of the information handling system platform 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;
• and
• using the at least one processing device of the information handling system platform to control a transmitter of the information handling system platform to reduce RF transmit power from one or more antennas of the information handling system platform 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;
• 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 method further comprises using the at least one processing device 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, and
• control 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.

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 the at least one processing device is further configured to receive proximity-indicative signals from one or more proximity sensors located on one or more off-platform devices;
• and to control the transmitter to reduce RF transmit power based at least in part on the received proximity-indicative signals from the one or more proximity sensors located on one or more off-platform devices.

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
• where the proximity distance sensing profile includes a blended relationship of different RF transmit power reduction values derived from different sensors as a function of proximity detection distance from the multiple sensors;
• and
• where the proximity distance sensing profile comprises a lookup table of blended power reduction values that are each calculated from average RF transmit power reduction values for two or three sensors having adjacent effective object distance detection ranges.

A method of operating an information handling system platform, comprising:

• using multiple sensors of the information handling system platform to detect 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;
• using at least one processing device of the information handling system platform 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;
• and
• using the at least one processing device of the information handling system platform to control a transmitter of the information handling system platform to reduce RF transmit power from one or more antennas of the information handling system platform 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
• using the at least one processing device to receive proximity-indicative signals from one or more proximity sensors located on one or more off-platform devices;
• and to control the transmitter to reduce RF transmit power based at least in part on the received proximity-indicative signals from the one or more proximity sensors located on one or more off-platform devices.

A method of operating an information handling system platform, comprising:

• using multiple sensors of the information handling system platform to detect 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;
• using at least one processing device of the information handling system platform 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;
• and
• using the at least one processing device of the information handling system platform to control a transmitter of the information handling system platform to reduce RF transmit power from one or more antennas of the information handling system platform 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;
• where the proximity distance sensing profile includes a blended relationship of different RF transmit power reduction values derived from different sensors as a function of proximity detection distance from the multiple sensors;
• and
• where the proximity distance sensing profile comprises a lookup table of blended power reduction values that are each calculated from average RF transmit power reduction values for two or three sensors having adjacent effective object distance detection ranges.