Inertial and Proximity Sensing for 5G Radio Exposure Mitigation
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Solution Overview
Problem
Existing methods for controlling human exposure to high-frequency radio waves, particularly in 5G cellular systems, fail to effectively mitigate exposure when devices are held or carried by users, potentially exceeding Maximum Permissible Exposure (MPE) limits.
Innovation Solution
An apparatus comprising an inertial sensor system, a proximity sensor system, an antenna system, and a control system that uses inertial sensor data to determine if the device is being held or carried, thereby controlling the proximity sensor system and antenna system to reduce exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If existing methods for controlling human exposure to high-frequency radio waves are used, then MPE limit compliance is maintained in some scenarios, but exposure mitigation fails when devices are held or carried by users
Solution Approach 1:
The system performs preliminary detection using inertial sensors to determine if the device is being held or carried before radio transmission occurs. By anticipating the exposure risk condition in advance, the system can proactively adjust transmission power or activate mitigation measures, ensuring MPE compliance is maintained rather than reactively addressing violations after they occur.
Solution Approach 2:
The patent introduces inertial sensors as an intermediary detection mechanism between the user and the radio transmission system. These sensors detect device orientation, motion, and handling patterns to infer whether the device is being held or carried, providing indirect but reliable information about exposure conditions without requiring direct contact sensors or user input.
2Object-affected harmful factors
If transmission power is reduced to mitigate exposure, then user safety is improved, but communication performance and data rates deteriorate
Solution Approach 1:
The system dynamically adjusts transmission power based on real-time detection of device handling conditions. When inertial sensors indicate the device is being held or carried, the system reduces power to mitigate exposure; when the device is placed on a surface or not being held, the system restores full transmission power. This dynamic adaptation allows the system to optimize both safety and performance according to actual usage scenarios.
Solution Approach 2:
The patent changes the transmission power parameter conditionally based on detected device state. By monitoring inertial sensor data for patterns indicating holding or carrying, the system modifies the power level parameter to balance exposure reduction with communication effectiveness, ensuring MPE compliance only when necessary rather than maintaining reduced power continuously.
3Measurement precision
If proximity sensors are activated continuously to detect nearby objects, then exposure control accuracy is improved, but energy consumption increases
Solution Approach 1:
The system merges the functions of inertial sensors and proximity sensors to achieve accurate exposure control. Inertial sensors continuously monitor device handling with low power consumption, and only when they detect conditions suggesting potential exposure risk do they trigger the higher-power proximity sensors to perform detailed object detection. This combined approach leverages the strengths of both sensor types while minimizing overall energy usage.
Solution Approach 2:
Inertial sensors perform preliminary screening to identify situations where proximity detection would be necessary. By detecting device orientation and motion patterns that suggest the device is being held near the user's body, the system pre-conditions the activation of proximity sensors, ensuring they operate only when truly needed for accurate exposure assessment rather than running continuously.
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).