Wi-Fi Sensing for RF Exposure Reduction Around Nearby Users
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Solution Overview
Problem
Existing wireless devices do not effectively reduce RF energy exposure for humans located a few feet or meters away from the device, as proximity sensors only detect objects in contact or close proximity, failing to account for individuals in line-of-sight or multiple device environments.
Innovation Solution
Implement Wi-Fi sensing technology to detect and discriminate between animate and inanimate objects, estimate their distance and location, and adapt transmission parameters to reduce RF energy exposure, using Doppler analysis and beamforming techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If capacitive proximity sensors are used for human body detection, then SAR control is achieved for devices in contact or close proximity, but RF energy exposure is not reduced for humans located a few feet or meters away from the device
Solution Approach 1:
The Wi-Fi system performs multiple functions: it provides wireless communication while simultaneously performing human detection and SAR control through sensing capabilities. The same Wi-Fi infrastructure is used for both data transmission and safety monitoring, eliminating the need for separate detection systems and enabling broader coverage beyond contact-level proximity sensing.
Solution Approach 2:
The patent replaces traditional capacitive proximity sensors with Wi-Fi sensing technology that uses radio wave propagation characteristics. Instead of relying on electrical field interactions at contact level, the system uses Wi-Fi signal reflections, absorptions, and Doppler effects to detect human presence and movement at distances of several feet or meters, thereby extending the effective detection range.
2Object-affected harmful factors
If Wi-Fi sensing is implemented for broad coverage detection, then RF energy exposure can be reduced for distant users, but device complexity increases
Solution Approach 1:
The patent combines Wi-Fi communication functionality with sensing capabilities into a unified system. The access point uses the same radio frequency infrastructure for both data transmission and human detection, merging communication and safety monitoring functions. This integration leverages existing Wi-Fi hardware and protocols, reducing the need for additional specialized components and minimizing the increase in device complexity.
Solution Approach 2:
The Wi-Fi system performs self-monitoring and self-adjustment for SAR control. The access point automatically detects human presence through Wi-Fi signal characteristics and dynamically adjusts transmission parameters without requiring external sensors or manual intervention. The system uses its own communication signals for both data transfer and safety monitoring, making the sensing mechanism self-sufficient.
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
Effectively reduces RF energy exposure to humans and animals by dynamically adjusting transmission power and beamforming based on their presence and location, ensuring compliance with SAR standards and enhancing radiation safety.
Implementation Method 1
detecting motion of objects in its coverage area, and discriminate between inanimate objects or human body by detecting the permittivity of surfaces
Implementation Method 2
estimate a distance to the detected objects
Implementation Method 3
adapt transmission parameters to reduce RF energy exposure, using Doppler analysis and beamforming techniques
Data Source
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AI summary
Provided herein is radiation safety mechanism based on Wi-Fi sensing. The disclosure provides an apparatus, comprising: a memory; and processor circuitry coupled with the memory, wherein the processor circuitry is to: obtain an environment map of a Wireless Fidelity (Wi-Fi) device, based on Wi-Fi sensing of a detecting module of the Wi-Fi device; estimate a distance between the Wi-Fi device and an animate object within the environment map or a location of the animate object; and adapt, based on the distance or the location, a communication parameter of the Wi-Fi device to reduce RF energy exposure on the animate object, and wherein the memory is to store the environment map. Other embodiments may also be disclosed and claimed.