Multi-Radio Power Allocation Under RF Exposure Limits

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Solution Overview

Problem

Existing wireless communication devices face challenges in efficiently allocating energy among multiple radios to comply with RF exposure limits, leading to potential energy wastage and suboptimal performance.

Innovation Solution

A method and apparatus for determining base and dynamic reserves of transmit power for each radio, ensuring compliance with time-averaged RF exposure limits by allocating energy efficiently across multiple radios based on specific criteria such as network conditions and transmission duty cycles.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If transmit power is increased to improve communication performance, then data rates and communication range are improved, but RF exposure limits are exceeded

Engineering Contradiction:

Improvedata ratesVSAvoidRF exposure

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent implements dynamic power allocation that continuously adjusts transmit power levels based on real-time conditions. The system monitors RF exposure levels, communication performance metrics, and network conditions to dynamically optimize power distribution across multiple radios, allowing high data rates when safe and reducing power when exposure limits are approached

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes multiple parameters simultaneously including transmit power levels, time-averaging window adjustments, and radio selection criteria. By modifying these parameters dynamically, the system achieves compliance with RF exposure limits while maintaining optimal communication performance through coordinated parameter adjustment

Inventive Principle:

Principle #35Parameter changes

2Reliability

If transmit power is reduced to comply with RF exposure limits, then RF exposure compliance is improved, but communication performance and data rates deteriorate

Engineering Contradiction:

ImproveRF exposure complianceVSAvoidcommunication performance

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent segments the total available power budget into multiple independent power pools, one for each radio. This segmentation allows the system to allocate power strategically across different radios based on their specific communication needs and exposure characteristics, ensuring compliance while maintaining overall system performance through distributed power management

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system dynamically reallocates power segments between radios based on real-time conditions. When one radio approaches exposure limits, the system dynamically shifts power allocation to other radios, maintaining communication performance through adaptive power distribution that responds to changing operational conditions

Inventive Principle:

Principle #15Dynamics

3Reliability

If energy is allocated conservatively to ensure RF exposure compliance, then compliance is improved, but energy wastage increases and performance becomes suboptimal

Engineering Contradiction:

ImproveRF exposure complianceVSAvoidenergy wastage

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent implements a feedback mechanism that continuously monitors actual RF exposure levels, power consumption, and communication performance. This feedback loop enables the system to learn from past allocations and optimize future power distribution, preventing both over-allocation (wastage) and under-allocation (performance degradation) while ensuring compliance

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system performs self-optimization by automatically adjusting power allocations based on monitored conditions without external intervention. The autonomous power management system evaluates communication needs, exposure levels, and energy efficiency metrics to self-adjust allocations, eliminating energy wastage while maintaining compliance and performance

Inventive Principle:

Principle #25Self-service

4Productivity

If multiple radios operate simultaneously at high power, then communication performance is improved, but cumulative RF exposure exceeds limits

Engineering Contradiction:

Improvecommunication performanceVSAvoidcumulative RF exposure

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent merges the power management of multiple radios into a unified power budget system. By combining individual radio power requirements into a single allocable resource pool, the system coordinates transmissions across radios to achieve cumulative performance goals while ensuring total exposure remains within limits through centralized power allocation

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS12471040B2Energy allocation among multiple radios for radio frequency (RF) exposure compliance

Publication Date: 2025.11.11 QUALCOMM INC

AI summary

Certain aspects of the present disclosure provide techniques and apparatus for operating a wireless communication device pursuant to radio frequency (RF) exposure compliance. A method that may be performed by a wireless device includes determining a base reserve and a dynamic reserve for each of a plurality of radios; and transmitting a signal with at least one of the radios at a transmit power determined based at least in part on one or more maximum time-averaged RF exposure limits associated with each of the radios and on the base reserve and the dynamic reserve for each of the radios.