Terminal Power Adjustment Using Motion Sensing for SAR Reduction
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Solution Overview
Problem
Existing power adjustment methods in mobile terminals are inefficient in controlling Specific Absorption Rate (SAR) values, particularly when multiple communication systems are active, leading to increased electromagnetic wave absorption affecting the human body.
Innovation Solution
A power adjustment method using an acceleration sensor to detect movement changes, determining a target power value based on the running application, and adjusting signal transmission power accordingly to reduce SAR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple communication systems are transmitted simultaneously in the terminal, then the communication functionality and coverage are improved, but the SAR value increases and the impact on human body increases
Solution Approach 1:
The patent implements dynamic power adjustment by detecting terminal movement state through acceleration sensors and modifying transmission power accordingly. When the terminal is detected to be in motion, the system dynamically reduces transmission power of communication systems, thereby lowering SAR value while maintaining communication functionality when stationary. This dynamic adaptation resolves the contradiction between communication versatility and SAR reduction.
2Object-affected harmful factors
If SAR sensor is installed to detect user usage scenarios and adjust transmission power, then the SAR value is reduced, but the device complexity increases
Solution Approach 1:
The patent replaces the traditional SAR sensor (capacitive proximity sensor) with an acceleration sensor-based movement detection system. This substitution uses mechanical motion detection to infer usage scenarios that previously required electromagnetic field sensing, thereby reducing device complexity while achieving similar or better SAR control effectiveness through movement-based power adjustment.
Solution Approach 2:
The acceleration sensor serves multiple functions: it detects terminal movement state for SAR control, identifies usage scenarios, and triggers power adjustment decisions. This multi-functional approach eliminates the need for dedicated SAR sensors, reducing overall device complexity while maintaining comprehensive SAR management capabilities across different usage conditions.
3Object-affected harmful factors
If traditional SAR sensor is used to detect usage scenarios, then the SAR value is controlled, but the power adjustment efficiency is low
Solution Approach 1:
The patent replaces electromagnetic field-based SAR sensing with mechanical motion sensing via acceleration sensors. This substitution enables faster and more direct detection of terminal movement state, triggering quicker power adjustment responses. The mechanical detection approach provides more immediate feedback for power control, significantly improving power adjustment efficiency compared to traditional SAR sensor methods.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Improves the efficiency of power adjustment in mobile terminals by dynamically adjusting transmission power based on user scenarios, thereby reducing the impact on the human body.
Implementation Method 1
a acceleration sensor is used to detect the change of acceleration value of a terminal in different directions
Data Source
AI summary
Disclosed in embodiments of the present application is a power adjustment method, comprising: determining variation values of a plurality of sample movement parameters during operation of a terminal; if a maximum variation value among the variation values of the plurality of sample movement parameters is greater than a preset threshold, obtaining a foreground application running currently; determining from a preset power set a target power value corresponding to the foreground application; and adjusting a current signal transmission power of the terminal based on the target power value.