Radar-Based Power Control for Human Presence Detection
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Solution Overview
Problem
In wireless communication networks, especially in NR networks, User Equipments (UEs) face challenges in managing transmitted power levels due to regulatory limits on RF electromagnetic radiation exposure, requiring reliable methods to detect human presence to avoid unnecessary power reduction.
Innovation Solution
The solution involves using radar measurements to obtain distance data, determining the accuracy of these measurements, and calculating a lower bound for reliable distance estimation, which is then used to control transmitted power levels, ensuring compliance with safety guidelines by adjusting power based on the presence or absence of a human body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE reduces transmitted power to comply with safety guidelines when human presence is undetected, then safety compliance is improved, but network efficiency and user experience deteriorate due to unnecessary power reduction
Solution Approach 1:
The patent implements a feedback mechanism where the UE continuously performs radar measurements to detect human presence and dynamically adjusts transmitted power based on detection results. The system uses measurement outcomes (human detected/not detected) to control power levels, creating a closed-loop system that resolves the contradiction by only reducing power when actually necessary for safety compliance.
Solution Approach 2:
The patent replaces traditional mechanical or rule-based power control mechanisms with radar-based electromagnetic detection. Instead of using fixed power reduction rules or simple proximity sensors, the system employs radar measurements to accurately detect human presence, enabling more precise and adaptive power control that maintains safety while improving network efficiency.
2Reliability
If the UE uses fixed power reduction to ensure safety compliance, then safety compliance is improved, but measurement precision and power control reliability worsen due to inability to distinguish actual human presence from absence
Solution Approach 1:
The patent transitions from static fixed power reduction to dynamic adaptive power control. The system continuously performs radar measurements and adjusts power levels in real-time based on detected human presence. This dynamic approach allows the system to accurately respond to changing conditions, improving both detection precision and power control reliability by adapting to actual environmental conditions rather than applying fixed rules.
Solution Approach 2:
The patent performs preliminary radar measurements and accuracy assessments before making power control decisions. By conducting measurements during measurement intervals and evaluating measurement accuracy indicators in advance, the system ensures that power adjustments are based on reliable detection data, thereby improving both presence detection accuracy and subsequent power control reliability.
3Measurement precision
If the UE performs continuous radar measurements to accurately detect human presence, then human presence detection accuracy is improved, but energy consumption increases
Solution Approach 1:
The patent implements periodic radar measurements during specifically designated measurement intervals rather than continuous monitoring. The system performs measurements at scheduled times (e.g., during uplink gaps, downlink gaps, or unscheduled slots) and uses these periodic measurements to control power levels. This periodic approach maintains detection accuracy while significantly reducing energy consumption compared to continuous measurement.
Solution Approach 2:
The patent performs measurements at sufficient frequency to ensure accurate human presence detection during critical periods, but not necessarily continuously. By performing measurements during key measurement intervals and using measurement accuracy indicators to determine when measurements are sufficient, the system achieves adequate detection precision without the excessive energy consumption of continuous monitoring.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the reliability of power control, reducing unnecessary power reductions and ensuring safe exposure limits by dynamically adjusting transmission power based on accurate distance measurements, thereby improving network efficiency and user safety.
Implementation Method 1
obtain distance data from one or more radar measurements wherein the radar measurements are performed during a measurement interval
Data Source
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AI summary
Examples of the disclosure relate to management of radar measurements for controlling transmitted power levels. Examples of the disclosure relate to apparatus (110), methods and computer programs. The apparatus comprise means for obtaining distance data from one or more radar measurements wherein the radar measurements are performed during a measurement interval; determining an indication of accuracy from the obtained distance data; determining a lower bound for a reliable distance measurement based on the distance data and the indication of accuracy; and controlling transmitted power based on the lower bound for a reliable distance measurement.