Dynamic UE Uplink Power Requests for Heat and Exposure Control

Solution Overview

Problem

Existing 3GPP 5G NR FR2 specifications may set inappropriate power levels for UE communication, leading to overheating and excessive exposure to human bodies, necessitating dynamic power adjustments.

Innovation Solution

The UE dynamically adjusts transmission power based on conditions such as overheating and MPE exposure by implementing event-triggered power reduction methods, including duty cycle manipulation, slot aggregation, and RRC signaling to maintain communication quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If the UE transmits at high power levels as specified in 3GPP 5G NR FR2 specifications, then communication coverage and signal strength are improved, but the UE overheats and excessive electromagnetic exposure to human bodies occurs

Engineering Contradiction:

Improvetransmission powerVSAvoidUE temperature

Core Design Contradiction:

PowerVSTemperature

Solution Approach 1:

The patent implements dynamic power adjustment by introducing a duty cycle parameter that modulates the transmission power over time. The UE transitions from static high power transmission to dynamic power transmission, where the actual transmit power is applied only during active subframes according to the duty cycle ratio, thereby reducing average power and heat generation while maintaining peak communication performance when needed.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent employs periodic transmission patterns by dividing the transmission timeline into frames containing active subframes and dormant subframes. The UE transmits periodically at high power during active subframes and remains silent during dormant subframes, creating a periodic action pattern that reduces cumulative heat generation while maintaining effective communication coverage through periodic high-power bursts.

Inventive Principle:

Principle #19Periodic action

2Power

If the UE transmits at high power levels, then communication signal strength is improved, but electromagnetic exposure to human bodies exceeds regulatory limits

Engineering Contradiction:

Improvetransmission powerVSAvoidelectromagnetic exposure

Core Design Contradiction:

PowerVSObject-affected harmful factors

Solution Approach 1:

The patent implements dynamic power adjustment by introducing a duty cycle parameter that modulates the transmission power over time. The UE transitions from static high power transmission to dynamic power transmission, where the actual transmit power is applied only during active subframes according to the duty cycle ratio, thereby reducing average power and heat generation while maintaining peak communication performance when needed.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent employs periodic transmission patterns by dividing the transmission timeline into frames containing active subframes and dormant subframes. The UE transmits periodically at high power during active subframes and remains silent during dormant subframes, creating a periodic action pattern that reduces cumulative heat generation while maintaining effective communication coverage through periodic high-power bursts.

Inventive Principle:

Principle #19Periodic action

3Temperature

If the UE reduces transmission power dynamically, then overheating and electromagnetic exposure are reduced, but communication quality may deteriorate

Engineering Contradiction:

ImproveUE temperatureVSAvoidcommunication quality

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

The patent implements dynamic power adjustment by introducing a duty cycle parameter that modulates the transmission power over time. The UE transitions from static high power transmission to dynamic power transmission, where the actual transmit power is applied only during active subframes according to the duty cycle ratio, thereby reducing average power and heat generation while maintaining peak communication performance when needed.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent incorporates feedback mechanisms where the UE monitors communication quality metrics and adjusts the duty cycle parameter accordingly. The network device receives feedback about the UE's power reduction status and communicates back whether the current duty cycle setting maintains acceptable communication quality, enabling closed-loop optimization that adapts power reduction to actual communication needs.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS12414047B2Dynamic power reduction requests for wireless communications

Publication Date: 2025.09.09 APPLE INC

AI summary

Methods and systems for controlling uplink (UL) transmission power of a user equipment (UE) electronic device includes determining, using the UE electronic device, that a maximum power availability for a transmission between the UE and a wireless network node is not appropriate to current conditions. Based on the determination that maximum power availability is not appropriate the UE electronic device sends a request to the wireless network node to reduce power for communication with the wireless network node. Based on the request, the UE electronic device communicates at a reduced power level for communications with the wireless network node.