Radio Module TX Power Limit Control for RF Exposure Compliance

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Solution Overview

Problem

Existing methods set radio module TX power limits based on worst-case scenarios, leading to suboptimal user experience and potential RF exposure violations.

Innovation Solution

A method and radio module design that dynamically adjust TX power limits based on scenario-specific information, including antenna tuner codewords, channel frequency ranges, and exposure conditions, to ensure compliance with regulatory RF exposure limits while maximizing power utilization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If TX power limit is set based on worst-case scenario, then RF exposure compliance is ensured, but user experience and power utilization deteriorate

Engineering Contradiction:

ImproveRF exposure complianceVSAvoidpower utilization

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent applies dynamics by transitioning from a static worst-case TX power limit to a dynamic TX power limit that adapts to real-time transmission scenarios. The system continuously monitors transmission parameters (antenna tuner codewords, channel frequency ranges, modulation methods) and adjusts the TX power limit accordingly, allowing the system to operate at higher powers when safe while maintaining compliance when necessary.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter of TX power limit from a fixed value based on worst-case assumptions to a variable parameter that is recalculated based on actual transmission conditions. By monitoring scenario-specific parameters (TX antenna tuner CW, RX antenna tuner CW, channel frequency range, modulation method) and updating the power limit dynamically, the system optimizes power utilization while maintaining RF exposure compliance.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If TX power limit is set based on worst-case scenario, then regulatory compliance is maintained, but user experience deteriorates

Engineering Contradiction:

Improveregulatory complianceVSAvoiduser experience

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The system dynamically adjusts the TX power limit based on real-time transmission scenarios rather than using a fixed conservative limit. This allows the radio module to operate at optimal power levels for each scenario, improving user experience while maintaining regulatory compliance through continuous monitoring and adjustment.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent implements feedback mechanisms where the system monitors transmission parameters (antenna tuner codewords, channel conditions, modulation methods) and uses this information to adjust the TX power limit. This closed-loop approach ensures that power limits are optimized based on actual performance while maintaining compliance with regulatory requirements.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS20260046788A1Method for dynamically adjusting transmitting power limit of radio module and associated radio module

Publication Date: 2026.02.12 MEDIATEK INC

AI summary

A method for dynamically adjusting a transmitting (TX) power limit of a radio module includes: obtaining at least one message of the radio module or at least one message of at least one other radio module, for acting as TX power reference information; determining a scenario of a TX power of the radio module according to the TX power reference information; and determining the TX power limit of the radio module according to the scenario.