RF Exposure Reduction via Transmitter Contribution Analysis
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Solution Overview
Problem
Modern wireless devices face challenges in complying with radio frequency (RF) exposure limits, particularly when simultaneously transmitting signals using multiple wireless communication technologies, as existing methods struggle to assess and adjust transmission power in real-time to ensure compliance with RF exposure limits set by regulators.
Innovation Solution
A wireless device equipped with a processor that determines RF exposure values based on transmission power levels, calculates the contribution of each transmitter to the RF exposure, and adjusts the transmission power levels accordingly to meet compliance, using techniques such as scaling RF exposure distributions and combining normalized SAR and PD distributions to ensure peak values do not exceed safety limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple transmitters operate at high power levels simultaneously, then communication performance and data throughput are improved, but RF exposure limits are exceeded causing compliance issues
Solution Approach 1:
The patent segments the RF exposure assessment by determining individual contribution values for each transmitter to the total SAR or PD at the user location. This allows the system to identify which specific transmitters are contributing most to the harmful RF exposure, enabling targeted power reduction rather than blanket power reduction across all transmitters.
Solution Approach 2:
The patent dynamically changes the transmission power parameter for individual transmitters based on real-time RF exposure assessments. When the processor determines that total RF exposure exceeds regulatory limits, it adjusts the power level of specific transmitters downward to bring the combined exposure back within compliance thresholds while maintaining optimal communication performance.
2Object-affected harmful factors
If transmission power is reduced to comply with RF exposure limits, then RF exposure compliance is achieved, but communication performance and signal quality deteriorate
Solution Approach 1:
The patent applies local quality by reducing power only for specific transmitters that are contributing most to excessive RF exposure at the user location, rather than uniformly reducing power across all transmitters. The processor identifies individual transmitter contributions and selectively adjusts only those that need reduction, preserving communication performance from other transmitters that are not causing compliance issues.
Solution Approach 2:
The patent implements dynamic power adjustment where the system continuously monitors RF exposure levels and transmission conditions, then adaptively modifies transmitter power levels in real-time. This allows the system to maintain high power levels when RF exposure is compliant and automatically reduce power only when necessary to meet regulatory limits, optimizing both compliance and performance under varying conditions.
3Measurement precision
If real-time RF exposure assessment is implemented for multiple transmitters, then compliance accuracy is improved, but computational complexity and processing requirements increase
Solution Approach 1:
The patent reduces computational complexity by segmenting the RF exposure assessment into individual transmitter contribution calculations. Instead of performing complex combined field calculations for all transmitters simultaneously, the processor calculates separate contribution values for each transmitter based on their individual power levels and spatial relationships to the user, then sums these contributions to determine total exposure. This segmented approach simplifies the computational burden while maintaining assessment accuracy.
Data Source
AI summary
According to certain aspects a wireless device includes transmitters, and a processor coupled to the transmitters. The processor is configured to determine a radio frequency (RF) exposure value at a peak location based on transmission power levels for the transmitters, determine a contribution of each one of the transmitters to the RF exposure value at the peak location, and reduce the transmission power level for each one of one or more of the transmitters based on the contributions of the transmitters to the RF exposure value at the peak location.