Wireless RF Exposure Control Using Preset Power Thresholds
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Solution Overview
Problem
Existing methods for controlling radio frequency exposure in wireless devices significantly impact communication performance and can cause interruptions, while also being inefficient and requiring extensive real-time calculations.
Innovation Solution
A method and apparatus that control radio frequency exposure by calculating an average exposure value over a target time window, setting power thresholds based on this value, and adjusting transmit power within controlled time windows to ensure compliance with exposure limits without real-time calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If real-time power back-off is performed based on actual running status, then radio frequency exposure compliance is achieved, but communication performance is greatly affected and interruptions occur
Solution Approach 1:
The patent pre-calculates and stores a mapping relationship between average radio frequency exposure values and power thresholds before actual operation. When deployment, the system only needs to query the pre-computed power threshold corresponding to the current average exposure value, rather than performing real-time calculations or immediate power back-off adjustments. This preliminary preparation eliminates communication interruptions while ensuring exposure compliance.
2Object-affected harmful factors
If real-time detection and power back-off are performed, then radio frequency exposure is controlled, but calculation overhead and processing time increase
Solution Approach 1:
The patent pre-calculates the mapping relationship between average radio frequency exposure values and corresponding power thresholds during system initialization or offline processing. This mapping table is stored for quick reference during operation. When the system needs to adjust power, it simply queries the pre-computed table based on the current average exposure value, reducing processing time from real-time calculation to simple table lookup.
3Object-affected harmful factors
If continuous real-time monitoring is performed, then exposure compliance is ensured, but system complexity and computational burden increase
Solution Approach 1:
The patent pre-computes and stores the mapping relationship between average radio frequency exposure values and power thresholds before actual operation. This transforms a complex real-time control problem into a simple query operation. The system maintains an exposure value threshold mapping relationship that can be directly referenced, significantly reducing computational burden and system complexity while ensuring continuous compliance.
Data Source
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AI summary
Embodiments of this application provide a method and an apparatus for controlling radio frequency exposure of a wireless device, and the wireless device. The method includes: obtaining an average radio frequency exposure value over a target time window, where the target time window is a standard time window; determining a power threshold corresponding to the average radio frequency exposure value, where the power threshold is a preset power value corresponding to a preset value range to which the average radio frequency exposure value belongs; and controlling a transmit power of the wireless device based on the power threshold over a controlled time window, where a start moment of the controlled time window is an end moment of the target time window, and duration of the controlled time window is shorter than duration of the standard time window. In the method, the power threshold is appropriately set as it is preset according to an actual application scenario. Therefore, controlling radio frequency exposure of the wireless device based on the power threshold does not affect communication performance of the wireless device, and has better applicability.