Wearable Wireless Link Control via Time-Averaged SAR

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Solution Overview

Problem

Wearable devices face challenges in efficiently managing wireless communication links to balance quality of service (QoS) and radiation exposure, particularly in scenarios where proximity to the user affects transmission power and resource allocation.

Innovation Solution

A wearable device equipped with sensors and processors that detect user proximity and predict radiation exposure, adjusting radio resource allocation based on quality of service (QoS) and time-averaged specific absorption rate (SAR) to ensure reliable communication links while maintaining radiation exposure within safe thresholds.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If transmission power is increased to improve quality of service, then communication reliability is improved, but radiation exposure increases above safety thresholds

Engineering Contradiction:

Improvecommunication link reliabilityVSAvoidradiation exposure

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The system implements periodic measurement of user proximity using sensors and periodically adjusts transmission power accordingly. During brief periods when users are absent, higher power is transmitted to maintain QoS, while during periods when users are present, power is reduced to maintain safe radiation levels, creating a time-varying transmission pattern that satisfies both requirements

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The transmission power is made dynamic rather than static, continuously adapting based on real-time proximity sensor data. The system transitions between different power states (high power when user absent, low power when user present) to dynamically balance communication performance with radiation safety

Inventive Principle:

Principle #15Dynamics

2Object-affected harmful factors

If transmission power is reduced to maintain safe radiation exposure levels, then radiation safety is improved, but quality of service deteriorates

Engineering Contradiction:

Improveradiation exposureVSAvoidcommunication link performance

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The system proactively reduces transmission power in advance when proximity sensors detect user presence, before QoS degradation can occur. This preliminary power reduction prevents the contradiction from manifesting by anticipating the need to balance safety and performance

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system continuously monitors proximity sensor output and uses this feedback to adjust transmission power in real-time. When sensors detect users approaching or present, the feedback loop triggers power reduction; when users are absent, power increases, creating a closed-loop control system that automatically resolves the contradiction

Inventive Principle:

Principle #23Feedback

3Productivity

If radio resources are allocated to multiple communication interfaces simultaneously, then overall communication capability is improved, but radiation exposure accumulates and exceeds thresholds

Engineering Contradiction:

Improvecommunication capabilityVSAvoidcumulative radiation exposure

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The system applies different power allocation strategies to different communication interfaces based on local conditions. When a user is present, interfaces closer to the user receive reduced power allocation, while interfaces farther away may maintain higher power levels, allowing differentiated resource distribution that respects local radiation safety requirements

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The system changes the power parameter for individual communication interfaces based on proximity sensor data and interface characteristics. By adjusting power levels per-interface rather than uniformly, the system can maintain adequate communication capability across multiple interfaces while ensuring cumulative radiation exposure remains below thresholds

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11671997B2Wireless link control based on time averaged specific absorption rate and quality of service

Publication Date: 2023.06.06 META PLATFORMS TECHNOLOGIES LLC

AI summary

Disclosed herein are related to a device controlling a wireless communication link based on an average amount of radiation exposure and quality of service (QoS). In one aspect, the device includes a processor configured to determine the QoS indicating a target performance of a communication link of a communication interface. In one aspect, the processor is configured to determine radio resource information of the communication link. In one aspect, the processor is configured to predict an amount of radiation exposure for a time period according to the QoS, the radio resource information, and the detected proximity of the user. In one aspect, the processor is configured to compare the predicted amount of radiation exposure for the time period against a time averaged threshold amount of radiation exposure. In one aspect, the processor is configured to allocate radio resources to the communication interface, according to the comparison.