Bluetooth Lighting Control Gated by RF Presence Detection

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Solution Overview

Problem

Connected lighting devices are vulnerable to unauthorized control via short-range point-to-point radio frequency signals, allowing malicious users to manipulate lighting systems without permission, posing security risks.

Innovation Solution

Implement RF-based presence detection to ensure that lighting devices are only controlled by a short-range point-to-point radio frequency signal if human presence is detected, using processors to analyze changes in radio frequency signals and execute control commands only when presence is confirmed.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a control unit continuously monitors sensor data to detect presence, then presence detection reliability is improved, but energy consumption increases

Engineering Contradiction:

Improvepresence detection reliabilityVSAvoidenergy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The control unit performs monitoring in periodic cycles rather than continuously. During active periods, sensor data is monitored to detect presence; during inactive periods, monitoring is suspended to conserve energy. This periodic monitoring approach maintains presence detection capability while significantly reducing overall energy consumption compared to continuous monitoring.

Inventive Principle:

Principle #19Periodic action

2Productivity

If control data is transmitted to a remote terminal for processing, then processing capability is improved, but data transmission time increases

Engineering Contradiction:

Improveprocessing capabilityVSAvoiddata transmission time

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The control unit pre-loads control data into its local memory before it is needed for processing. By having the data already available locally, the system avoids the time delay of transmitting data to a remote terminal when processing is required. This preliminary preparation of data maintains high processing capability while eliminating transmission delays.

Inventive Principle:

Principle #10Preliminary action

3Measurement precision

If sensor data is monitored continuously, then detection precision is improved, but energy consumption increases

Engineering Contradiction:

Improvedetection precisionVSAvoidenergy consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The control unit implements periodic monitoring of sensor data during active periods, ensuring detection precision is maintained when needed. Between active periods, monitoring is suspended to conserve energy. This approach achieves high detection precision during operational phases without the penalty of continuous energy consumption.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentEP4158921B1Executing control command in dependence on presence being detected

Publication Date: 2026.04.29 SIGNIFY HOLDING BV

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AI summary

A device (1) controllable by a short-range point-to-point radio frequency signal, e.g. a Bluetooth signal from a mobile device (23), is configured to receive, e.g. from the mobile device and neighboring lighting devices (11-12), one or more signals which comprise the short-range point-to-point radio frequency signal, determine changes in received radio frequency signals from the one or more signals, detect presence, e.g. of a resident (51), based on the changes, determine a control command from the short-range point-to-point radio frequency signal, and execute the control command in dependence on the presence being detected.