Device Orientation Feedback for mmWave Signal Quality and SAR

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Solution Overview

Problem

Beamforming technologies in mmWave communications increase RF radiation exposure and degrade signal quality due to user interference with the main beam, exceeding specific absorption rate (SAR) thresholds and affecting communication link quality.

Innovation Solution

The method involves determining the user's position and the direction of a partner communication device, comparing these to assess if the user is intercepting the main beam, and issuing notifications to adjust the terminal device's orientation. Additionally, the method computes an optimum transmission power based on the user's impact on the beam, dynamically adjusting power levels to maintain link quality and reduce radiation exposure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If beamforming is used to focus RF energy in narrow directions to improve throughput, then communication link quality is improved, but RF radiation exposure to users increases and SAR thresholds are exceeded

Engineering Contradiction:

ImprovethroughputVSAvoidRF radiation exposure

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The system continuously monitors user position relative to the main beam direction using sensors and communication data. When a user is detected in the main beam path, the system provides feedback by issuing notifications to the user device to change orientation, and dynamically adjusts transmission power levels to maintain SAR compliance while preserving communication quality when safe

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The transmission power level is dynamically adjusted based on real-time user position detection. When users are detected in the main beam path, power is reduced to comply with SAR thresholds; when users are outside the beam path, full power is restored to maintain high throughput. This dynamic adjustment resolves the contradiction between maintaining high productivity and reducing harmful RF radiation exposure

Inventive Principle:

Principle #15Dynamics

2Use of energy by moving object

If beamforming focuses RF energy in a narrow direction, then signal transmission efficiency is improved, but signal quality degrades when the focused beam points at a user

Engineering Contradiction:

Improvesignal transmission efficiencyVSAvoidsignal quality

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The system uses feedback from user position detection to dynamically control beamforming operations. When a user is detected in the main beam path, the system adjusts transmission parameters to maintain signal quality while reducing power; when no user is present, full beamforming efficiency is utilized. This feedback mechanism ensures both transmission efficiency and signal quality are maintained under different conditions

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS12267097B2Methods and devices for device orientation to improve signal quality and SAR compliance

Publication Date: 2025.04.01 ALTERA CORP

AI summary

Devices and methods for automatically determining and suggesting an optimal device orientation with respect to a partner communication device. The methods and devices may include features to determine a position of a user with respect to the device; estimate a direction of a partner communication device; perform a comparison of the direction of the partner communication device with the position of the user; and based on the comparison, determine whether to generate an instruction to suggest a change in orientation of the device.