Antenna-Specific RF Exposure Control Using Spatial Contributions
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Solution Overview
Problem
Existing wireless communication devices face challenges in accurately assessing RF exposure compliance due to collocated RF exposure hotspots among antennas, leading to conservative transmit power settings that affect communication performance.
Innovation Solution
Determine RF exposure contribution information for each antenna, incorporating spatial distribution data to perform time-averaged compliance evaluations, allowing for higher transmit power limits while ensuring compliance with RF exposure limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conservative transmit power settings are used to ensure RF exposure compliance, then RF exposure limits are met, but wireless communication performance deteriorates
Solution Approach 1:
The patent applies local quality by differentiating RF exposure assessment between antennas based on their spatial distribution. Instead of using a uniform conservative power limit for all antennas, the system determines individual transmit power limits for each antenna based on its specific spatial exposure characteristics. This allows higher power limits for antennas with lower exposure risk while maintaining compliance, thereby improving communication performance without sacrificing safety.
Solution Approach 2:
The patent segments the RF exposure assessment process into antenna-specific evaluations. By dividing the overall RF exposure problem into individual antenna contributions and assessing each antenna's spatial distribution separately, the system can apply tailored power limits to each antenna rather than applying a single conservative limit to all antennas, thus resolving the contradiction between compliance and performance.
2Measurement precision
If spatial distribution data is incorporated for accurate RF exposure assessment, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-determining and storing spatial distribution data and RF exposure contribution information for each antenna before actual communication occurs. This pre-computed spatial information is stored in the device memory and can be directly used during RF exposure compliance evaluations, eliminating the need for complex real-time measurements and reducing computational complexity while maintaining high measurement precision.
Solution Approach 2:
The patent uses copying by creating a simplified representation of the complex RF exposure problem through RF exposure contribution information. Instead of performing complex real-time RF exposure calculations, the system uses pre-determined contribution factors that replicate the essential spatial exposure characteristics, thereby achieving accurate assessment with reduced computational complexity.
Data Source
AI summary
Techniques and apparatus for radio frequency (RF) exposure compliance based on spatial information of RF exposure contributions among antennas of a wireless device are described. An example method generally includes accessing RF exposure contribution information associated with a plurality of antennas of the wireless device. At least one time-averaging operation is performed for at least a first antenna, based on the RF exposure contribution information. A transmit power limit is determined for the first antenna, based on the at least one time-averaging operation. A signal is transmitted from the first antenna at a transmission power level determined based at least in part on the transmit power limit in compliance with an RF exposure limit.