Antenna Power Control via Cumulative SAR Monitoring
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Solution Overview
Problem
Existing electronic devices face challenges in controlling power consumption while ensuring compliance with specific absorption rate (SAR) standards, which can lead to adverse effects on human health due to excessive electromagnetic wave absorption.
Innovation Solution
The proposed solution involves a device and method for controlling transmission power of an antenna based on an SAR margin in an electronic device. This is achieved by using a processor to manage power consumption and control the transmission power of the antenna, stopping state identification for sensors until a cumulative SAR reaches a specified threshold, thereby optimizing power usage and reducing SAR exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If sensor monitoring is continuously performed to ensure SAR compliance, then SAR safety is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic sensor monitoring where the monitoring frequency and state identification are adjusted based on current SAR conditions. When SAR levels are low, monitoring is reduced or stopped; when SAR approaches thresholds, monitoring intensifies. This dynamic adaptation resolves the contradiction by making the monitoring system flexible rather than static, reducing power consumption during low-risk periods while maintaining safety during high-risk periods.
Solution Approach 2:
The system changes operational parameters (monitoring intensity, state identification frequency) based on SAR margin levels. By monitoring SAR cumulative values and comparing against thresholds, the system adjusts the monitoring parameter states - switching between active monitoring, reduced monitoring, or stopped monitoring modes. This parameter-based control resolves the contradiction by optimizing the monitoring intensity to match actual SAR risk levels.
2Power
If transmission power is increased to improve communication performance, then communication quality is improved, but SAR exposure increases
Solution Approach 1:
The patent implements a feedback mechanism where transmission power decisions are based on monitored SAR cumulative values and SAR margin calculations. The system continuously monitors SAR levels, compares them against thresholds, and adjusts transmission power accordingly - reducing power when SAR approaches limits and allowing higher power when SAR margin is sufficient. This feedback loop resolves the contradiction by making transmission power adaptive to SAR conditions rather than fixed or purely demand-driven.
Solution Approach 2:
The system dynamically adjusts transmission power based on real-time SAR conditions. Rather than using fixed transmission power levels, the system modifies power output in response to SAR margin availability, creating a dynamic balance between communication performance and SAR compliance. This dynamic power control resolves the contradiction by allowing high power when safe and reducing power when necessary.
3Use of energy by moving object
If sensor monitoring is stopped to save power, then power consumption is reduced, but SAR compliance cannot be ensured
Solution Approach 1:
The patent applies partial monitoring action based on SAR risk levels. Instead of continuous full monitoring, the system performs monitoring selectively - stopping or reducing monitoring when SAR cumulative values are well below thresholds (low risk), and activating or intensifying monitoring when thresholds are approached (high risk). This partial action approach resolves the contradiction by providing just enough monitoring to ensure compliance while minimizing power consumption during low-risk periods.
Solution Approach 2:
The system changes the monitoring parameter state based on SAR conditions. By evaluating SAR margin and cumulative SAR values, the system adjusts monitoring intensity - switching between stopped, reduced, and active monitoring states. This parameter-based control resolves the contradiction by optimizing the balance between power savings and compliance assurance through conditional monitoring activation.
Data Source
AI summary
The present disclosure relates to an apparatus and a method for controlling power consumption for monitoring a sensor state in an electronic device. The electronic device can stop checking the state of at least one sensor until a radio resource control (RRC) connection is maintained, and a cumulative electromagnetic wave specific absorption rate (SAR) reaches a preset threshold value (SAR_threshold). The cumulative electromagnetic wave specific absorption rate may be an electromagnetic wave specific absorption rate accumulated by transmission power transmitted within a time period corresponding to a time slot using a specific frequency band.