Inertial and Proximity Sensor Control for RF Exposure Mitigation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for controlling human exposure to high-frequency radio frequencies used in 5G cellular systems, particularly in the millimeter wave region, are inadequate in ensuring compliance with Maximum Permissible Exposure (MPE) limits when devices are held or carried by users.
Innovation Solution
An apparatus comprising an inertial sensor system, a proximity sensor system, an antenna system, and a control system that communicates with these components. The control system receives inertial sensor data to determine if the device is being held, carried, or on a person's body, and adjusts the proximity sensor system and antenna system accordingly, such as deactivating the proximity sensor or lowering transmission power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the antenna system transmits at high power to achieve better data rates, then productivity is improved, but user exposure to radio frequencies may exceed MPE limits when the device is held or carried by the user
Solution Approach 1:
The system performs preliminary detection using inertial sensors to determine if the device is being held or carried before transmitting at high power. This advance knowledge allows the system to prevent harmful exposure by adjusting transmission power or deactivating the antenna system before high-power transmission occurs when the device is in close proximity to the user's body.
Solution Approach 2:
The system continuously monitors inertial sensor data to detect device usage scenarios and provides feedback to the control system. This feedback loop enables real-time adjustment of transmission power based on whether the device is being held, carried, or placed on surfaces, ensuring that high data rates are achieved only when safe, and exposure limits are never exceeded.
2Reliability
If the proximity sensor system remains active to detect target objects, then reliability of exposure control is improved, but power consumption increases
Solution Approach 1:
The inertial sensor system performs preliminary detection of device usage scenarios before the proximity sensor system is activated. When the device is detected being held or carried, the system can deactivate the proximity sensor or limit its operation, thereby reducing power consumption while maintaining reliable exposure control through the inertial sensor data alone.
Solution Approach 2:
The system applies partial action by selectively activating the proximity sensor system only when necessary - specifically when inertial sensor data indicates the device is being placed on surfaces or in locations where target object detection is needed for exposure control. This selective activation maintains reliability while minimizing unnecessary power consumption during held or carried scenarios.
Data Source
AI summary
Some disclosed devices include an inertial sensor system, a proximity sensor system, an antenna system configured to transmit and receive radio signals and a control system. The control system may be configured for receiving inertial sensor data from the inertial sensor system and controlling the proximity sensor system and/or the antenna system based, at least in part, on the inertial sensor data. In some examples, the control system may be configured for controlling the proximity sensor system and/or the antenna system based, at least in part, on whether the inertial sensor data indicates that the device is being held, is being carried or is on a person's body (e.g., is in the person's pocket).