Centralized RF Exposure Management Across Multiple Transmitters

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Solution Overview

Problem

Existing wireless devices with multiple transceivers fail to effectively manage RF exposure by considering overall RF power levels from multiple transmitters and surrounding environments, leading to potential health hazards and non-compliance with regulatory limits.

Innovation Solution

Implement a wideband RF sensor to measure surrounding RF power levels and adjust the transmission power of all transceivers in a device, using a centralized RF exposure manager to ensure compliance with regulatory limits and reduce overall RF exposure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiple transceivers operate simultaneously at high power, then communication performance and data throughput are improved, but RF exposure to users increases and regulatory compliance deteriorates

Engineering Contradiction:

Improvecommunication performanceVSAvoidRF exposure

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The system continuously monitors the aggregate RF power level from multiple transceivers and uses this feedback to dynamically adjust transmit powers. The RF exposure manager collects power level information from each transceiver, compares the aggregate against regulatory limits, and generates control signals to adjust individual transceiver powers in real-time, ensuring compliance while maintaining optimal communication performance

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system transitions from static power allocation to dynamic power adjustment. Transceiver powers are continuously adapted based on real-time monitoring of aggregate RF exposure levels, user proximity detection, and communication requirements. This allows the system to optimize performance when safe and reduce power when regulatory limits are approached

Inventive Principle:

Principle #15Dynamics

2Productivity

If transmit power of each transceiver is independently controlled, then individual link performance is optimized, but overall RF exposure management becomes complex and compliance becomes difficult

Engineering Contradiction:

Improveindividual link performanceVSAvoidpower management complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The system combines multiple independent power control functions into a single centralized RF exposure manager. This manager aggregates power level information from all transceivers and coordinates their power adjustments collectively, simplifying the overall control architecture while ensuring that the sum of all transmit powers remains within regulatory limits

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The RF exposure manager serves multiple functions simultaneously: it monitors aggregate RF power levels, detects user proximity, determines individual transceiver power levels, generates control signals for power adjustment, and ensures regulatory compliance. This multi-functional approach reduces the need for separate specialized components for each function

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Object-affected harmful factors

If RF exposure is reduced by lowering transmit powers, then user safety and regulatory compliance are improved, but communication range and data rate deteriorate

Engineering Contradiction:

Improveuser safetyVSAvoidcommunication range

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

The system dynamically changes power allocation parameters across multiple transceivers based on real-time conditions. When RF exposure approaches regulatory limits, the system adjusts the distribution of transmit powers among transceivers, potentially favoring lower-frequency operations or more efficient modulation schemes that achieve acceptable communication performance at reduced power levels

Inventive Principle:

Principle #35Parameter changes

4Reliability

If aggregate RF power is monitored and controlled, then regulatory compliance is ensured, but individual transceiver power flexibility is reduced

Engineering Contradiction:

Improveregulatory complianceVSAvoidtransceiver power flexibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The system applies partial power reduction to individual transceivers rather than uniformly reducing all powers. The RF exposure manager selectively adjusts powers of specific transceivers based on their contribution to aggregate exposure, their current communication requirements, and the margin to regulatory limits, preserving flexibility where possible while ensuring overall compliance

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS12425979B2Methods and devices of transmit power control for multiple transceivers in a single device or in a multiple device scenario

Publication Date: 2025.09.23 INTEL CORP

AI summary

This disclosure presents methods and devices that implement dynamic transmit power control techniques in terminal devices with multiple radio frequency (RF) transmitters and/or in a multi-terminal device environment to comply with regulatory RF exposure limits and standards while enhancing device performance. For example, the present disclosure provides a device including a processor configured to monitor a transmit power for each of a plurality of transmitters; determine a transmit power reduction to be applied to the plurality of transmitters based on a total simultaneous transmit power of the plurality of transmitters exceeding a threshold; define a respective amount of the transmit power reduction to be applied to each transmitter of the plurality of transmitters based on one or more parameters; and apply the respective amount of the transmit power reduction to each transmitter of the plurality of transmitters.