Multi-Radio Transmission Timing for RF Exposure Compliance

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Solution Overview

Problem

Existing wireless devices face challenges in complying with RF exposure limits due to simultaneous transmissions from time-averaged and non-time-averaged radio technologies, leading to non-compliance and reduced transmission power, especially when traditional methods statically split margins or prevent simultaneous transmissions.

Innovation Solution

Implementing a processor-controlled system that adjusts transmission timing and power levels by adding a wait time and limiting peak power for non-time-averaged technologies after time-averaged technologies are turned off, ensuring compliance with RF exposure limits while maximizing transmission power.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If simultaneous transmissions from multiple radio technologies are allowed, then device functionality and communication versatility are improved, but RF exposure compliance deteriorates due to cumulative exposure exceeding limits

Engineering Contradiction:

Improvedevice functionalityVSAvoidRF exposure

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The system dynamically adjusts transmission parameters including power levels and timing offsets based on real-time RF exposure calculations. The processor continuously monitors cumulative exposure from multiple transmitters and adapts their operation to maintain compliance while maximizing functionality.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The invention changes transmission parameters such as power levels and timing offsets to resolve RF exposure conflicts. When cumulative exposure approaches limits, the system modifies these parameters to reduce exposure while maintaining communication functionality.

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If transmission power is reduced to ensure RF exposure compliance, then harmful factors are reduced, but transmission power and device performance deteriorate

Engineering Contradiction:

ImproveRF exposureVSAvoidtransmission power

Core Design Contradiction:

Object-affected harmful factorsVSPower

Solution Approach 1:

Instead of static power reduction, the system dynamically adjusts power levels based on real-time exposure conditions. Transmission power is optimized by calculating safe levels that maintain compliance while maximizing communication performance.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system applies partial power reduction only when necessary for compliance rather than continuous reduction. By using timing offsets and selective power adjustment, it maintains full power for portions of transmission that do not violate exposure limits.

Inventive Principle:

Principle #16Partial or excessive action

3Object-affected harmful factors

If traditional methods statically split margins or prevent simultaneous transmissions, then RF exposure compliance is ensured, but device complexity and transmission efficiency deteriorate

Engineering Contradiction:

ImproveRF exposure complianceVSAvoidtransmission control complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The system replaces static margin splitting with dynamic real-time calculations of RF exposure. The processor continuously assesses cumulative exposure and adjusts transmitter operation accordingly, eliminating the need for complex pre-configured margin distributions.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The invention implements a feedback mechanism where the processor monitors RF exposure levels and uses this information to control transmitter operation. This closed-loop approach simplifies control by automatically adjusting based on measured conditions rather than requiring complex open-loop control strategies.

Inventive Principle:

Principle #23Feedback

4Object-affected harmful factors

If wait time is added between transmissions, then RF exposure compliance is improved, but transmission speed and productivity deteriorate

Engineering Contradiction:

ImproveRF exposure complianceVSAvoidtransmission speed

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

The system dynamically determines timing offsets based on real-time exposure conditions rather than using fixed wait times. Transmissions are scheduled to maintain compliance while minimizing gaps, optimizing the balance between safety and speed.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system uses periodic transmission patterns with calculated intervals that ensure compliance while maintaining high utilization. By optimizing the periodicity and timing of transmissions, it minimizes idle wait time while staying within exposure limits.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS20260106638A1Radio frequency exposure compliance

Publication Date: 2026.04.16 QUALCOMM INC

AI summary

In certain aspects, a method for wireless communication includes transmitting a first transmission with a first transmitter operable according to a first radio technology, and transmitting a second transmission with a second transmitter after completion of the first transmission, the second transmitter operable according to a second radio technology. The method may also include delaying transmission of the second transmission by a predetermined wait time after completion of the first transmission. The method may also include transmitting the second transmission with a limited peak power for a predetermined time period for at least a portion of the second transmission.