Radar-Triggered Uplink Power Control for MPE Compliance

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Solution Overview

Problem

Wireless communication systems face challenges in efficiently complying with Maximum Permissible Exposure (MPE) regulations and reducing uplink power to prevent overheating of human skin due to RF exposure, particularly in mmWave bands where hardware constraints limit digital chains and analog beamforming is used.

Innovation Solution

Implementing a radar system that detects proximity of objects to adjust transmission parameters to comply with MPE regulations by reducing power or duty cycle, and reporting MPE Power Management Power Reduction (P-MPR) when necessary, thereby optimizing energy use and compliance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If uplink transmission power is increased to improve communication quality, then signal quality improves, but Maximum Permissible Exposure (MPE) compliance deteriorates due to increased RF energy exposure

Engineering Contradiction:

Improvesignal qualityVSAvoidRF energy exposure

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent implements dynamic transmission power adjustment by continuously monitoring object proximity through radar detection and signal quality measurements. The transmission parameter is changed in real-time based on detected object proximity and signal conditions, allowing the system to optimize signal quality while maintaining MPE compliance through adaptive power control rather than fixed power levels

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system employs feedback mechanisms by measuring signal quality (RSRP/RSRQ) and object proximity continuously, then using this information to adjust transmission power. The radar system provides feedback about object location, and the communication system adjusts power based on both radar feedback and signal quality measurements, creating a closed-loop control system that balances communication performance with safety compliance

Inventive Principle:

Principle #23Feedback

2Reliability

If radar operations are continuously performed to ensure MPE compliance, then safety compliance improves, but energy consumption increases

Engineering Contradiction:

ImproveMPE complianceVSAvoidenergy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

Instead of continuous radar operation, the patent implements periodic radar detection triggered by specific conditions. Radar operations are initiated when signal quality measurements indicate potential object proximity (temporal condition on amplitude change), and the system periodically checks compliance status. This periodic approach maintains MPE compliance while significantly reducing energy consumption compared to continuous monitoring

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The system performs preliminary signal quality measurements and temporal condition checks before initiating radar operations. By detecting amplitude changes in reference signals that may indicate approaching objects, the system triggers radar detection only when necessary, rather than continuously operating radar. This preliminary detection mechanism prepares the system to activate radar only when MPE compliance might be at risk

Inventive Principle:

Principle #10Preliminary action

3Device complexity

If analog beamforming is used to overcome hardware constraints, then device complexity is reduced, but precision in detecting object proximity deteriorates

Engineering Contradiction:

Improvehardware complexityVSAvoidobject proximity detection precision

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent merges radar operations with wireless communication operations, allowing the same hardware (antenna elements, RF chains) to perform both functions. The analog beamforming capability developed for communication is leveraged for radar detection, eliminating the need for separate radar hardware and reducing overall device complexity while maintaining adequate detection precision through combined operation

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS12538238B2Power efficient radar operation for maximum permissible exposure compliance and uplink power reduction reporting

Publication Date: 2026.01.27 SAMSUNG ELECTRONICS CO LTD

AI summary

A method includes obtaining a set of signal quality measurements. The signal quality measurements correspond to reference signals, respectively, from among a plurality of reference signals received at an electronic device. The method includes determining whether a change in amplitude in the set of signal quality measurements satisfies a temporal condition. The method includes in response to a determination that the change in amplitude in the set of signal quality measurements satisfies the temporal condition, triggering the electronic device to perform radar operations to determine whether a location of an object in proximity to the electronic device satisfies a proximity condition. The method includes in response to a determination that the location of the object satisfies the proximity condition, changing a transmission parameter of uplink wireless signals to satisfy a maximum permissible exposure (MPE) of the object to radio frequency energy.