Base Station Power Threshold Smoothing for EMF-Limited Traffic

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Solution Overview

Problem

Existing wireless communication systems face challenges in managing electromagnetic field (EMF) exposure to ensure compliance with regulatory limits, particularly in high-traffic scenarios where legacy techniques like the token bucket mechanism lead to resource starvation, delay, and jittery service.

Innovation Solution

A method and apparatus for determining power thresholds at a base station using a virtual queue and hyper-parameters to smooth EIRP (Equivalent Isotropic Radiated Power) over time, ensuring compliance with EMF limits while maintaining seamless connectivity and fairness across users.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If traditional power management techniques are used in wireless communication systems, then transmission power can be maintained at high levels to ensure connectivity, but electromagnetic field (EMF) exposure exceeds maximum allowed limits

Engineering Contradiction:

ImproveEMF exposureVSAvoidconnectivity

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent implements dynamic power threshold adjustment by continuously monitoring cumulative power consumption and adapting the power threshold accordingly. The base station dynamically computes power thresholds based on real-time power consumption measurements and predicted traffic, allowing the system to maintain high transmission power when safe and reduce power when approaching EMF limits, thus resolving the contradiction between maintaining connectivity and reducing EMF exposure

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system employs feedback mechanisms by monitoring actual power consumption, comparing it against predicted consumption, and adjusting future power thresholds based on this feedback. The base station uses measured power consumption values to update its power threshold calculations, creating a closed-loop control system that ensures EMF compliance while maintaining optimal connectivity

Inventive Principle:

Principle #23Feedback

2Object-affected harmful factors

If power thresholds are strictly limited to meet EMF exposure requirements, then EMF exposure is reduced, but transmission power may be insufficient to maintain seamless connectivity and low traffic jitter

Engineering Contradiction:

ImproveEMF exposureVSAvoidtraffic throughput

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

The patent applies preliminary action by predicting future power consumption based on current traffic patterns and historical data. The base station computes power thresholds in advance using predicted power consumption values, allowing it to proactively adjust power levels before EMF limits are exceeded, thus maintaining both EMF compliance and optimal traffic throughput without reactive interruptions

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system changes the power threshold parameter dynamically based on predicted power consumption and current traffic conditions. By adjusting this critical parameter in real-time, the system optimizes the balance between EMF exposure reduction and maintaining sufficient transmission power for seamless connectivity and low traffic jitter

Inventive Principle:

Principle #35Parameter changes

3Object-affected harmful factors

If power thresholds are adjusted frequently to reduce EMF exposure, then EMF compliance is improved, but power threshold fairness deteriorates due to rapid fluctuations

Engineering Contradiction:

ImproveEMF exposureVSAvoidpower threshold fairness

Core Design Contradiction:

Object-affected harmful factorsVSStability of the object's composition

Solution Approach 1:

The patent implements periodic action by updating power thresholds at structured intervals based on sampling periods and predicted power consumption. Rather than continuous adjustment, the system periodically recomputes and applies power threshold updates, which smooths out fluctuations and maintains power threshold fairness while still achieving EMF compliance over time through systematic periodic control

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS12634842B2Traffic smoothing to reduce EMF exposure

Publication Date: 2026.05.19 NOKIA SOLUTIONS & NETWORKS OY

AI summary

A base station determines a power threshold to use for transmission in a sampling period in order to meet a power requirement defined to limit an amount of a function of radiated power, at least by: determining a set of admissible power thresholds; measuring overshoot in transmitted power; and computing the power threshold to be used for the transmission, as a function of the measured overshoot and the set of admissible power thresholds, to form the determined power threshold. The base station performs the transmission in the sampling period using the determined power threshold. Periodically, a set of hyper-parameters is found that improve expected performance in terms of power threshold fairness using multiple power thresholds and corresponding multiple power consumption values. The hyper-parameters are then used at least to computer the power thresholds used for transmission.