Dynamic Transmission Power Control for SAR Compliance
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Solution Overview
Problem
When an electronic device is in proximity to or gripped by a user, its communication module's performance deteriorates due to reduced transmission power to comply with Specific Absorption Rate (SAR) regulations, leading to suboptimal communication performance.
Innovation Solution
An electronic device with a processor and communication module that calculates an average transmission power value when proximity or grip is detected, adjusting the transmission power to either a lower or maximum power based on the average Specific Absorption Rate (SAR) threshold to maintain compliance and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If transmission power is reduced to comply with SAR regulations when proximity or grip is detected, then SAR compliance is improved, but communication module performance deteriorates
Solution Approach 1:
The patent applies dynamics by making the transmission power adjustable and variable based on real-time conditions. The system dynamically switches between first transmission power (when SAR threshold is exceeded) and second transmission power (when SAR threshold is not exceeded), allowing the communication module to adapt its power level to current operational conditions while maintaining SAR compliance when necessary and optimizing performance when safe to do so.
Solution Approach 2:
The patent changes the transmission power parameter based on SAR threshold evaluation. When the average SAR value exceeds the threshold, the system uses a first (reduced) transmission power to ensure compliance. When the average SAR value does not exceed the threshold, the system switches to a second (higher) transmission power to optimize communication performance, thus dynamically adjusting the power parameter based on measured conditions.
2Object-affected harmful factors
If transmission power is reduced to ensure SAR compliance during proximity or grip, then electromagnetic wave absorption is controlled, but signal transmission quality deteriorates
Solution Approach 1:
The system dynamically adjusts transmission power based on real-time SAR threshold evaluation. When the average SAR value exceeds the threshold during proximity or grip conditions, the system uses reduced transmission power to control electromagnetic wave absorption. When the threshold is not exceeded, the system increases transmission power to maintain signal transmission quality, creating a dynamic response to changing conditions.
Solution Approach 2:
The patent changes the transmission power parameter in response to SAR threshold measurements. By switching between first transmission power (when SAR threshold is exceeded) and second transmission power (when threshold is not exceeded), the system optimizes the balance between controlling electromagnetic wave absorption and maintaining signal transmission quality based on actual operational conditions.
3Object-affected harmful factors
If average SAR value is used to control transmission power, then SAR compliance is maintained, but communication performance is optimized compared to continuous backoff
Solution Approach 1:
The patent implements feedback by continuously measuring the average SAR value and using this information to control transmission power. The system calculates the average SAR value based on transmitted signals and adjusts the transmission power accordingly - reducing power when the average SAR exceeds the threshold and increasing power when it does not. This closed-loop feedback mechanism ensures SAR compliance while optimizing communication performance based on actual measured conditions rather than assuming continuous proximity or grip.
Solution Approach 2:
The system performs preliminary evaluation of the average SAR value before determining the appropriate transmission power level. By calculating and evaluating the average SAR value in advance, the system can proactively adjust transmission power to maintain compliance while avoiding unnecessary performance degradation, rather than reactively reducing power only after SAR violations are detected.
Data Source
AI summary
The present invention provides a method and electronic device for controlling transmission power. An electronic device according to various embodiments comprises: a communication module; a memory; and a processor electrically connected to the communication module and the memory, wherein the processor may store a transmission power value during a first time when approaching to or gripping of the electronic device is detected, calculate an average transmission power value of transmission power values stored during the first time, control the communication module to transmit a signal at a first transmission power when an average specific absorption rate value corresponding to the calculated average transmission power value exceeds a threshold specific absorption rate value, and control the communication module to transmit the signal at a second transmission power which is different from the first transmission power when the average specific absorption rate value does not exceed the threshold specific absorption rate value. In addition, other embodiments are possible.