Single-Sensor Movement Detection Using WiFi CSI Chaos Index
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Solution Overview
Problem
Existing methods for detecting movements of objects and/or living beings in indoor areas, such as those within a radio range, face limitations including the need for multiple sensors, delayed detection, energy wastage, and the requirement for individuals to carry devices, which do not meet the requirements of fast action, comprehensive coverage, and single-sensor functionality.
Innovation Solution
A method and system utilizing a single wireless-enabled device to detect movements by analyzing Channel State Information (CSI) values from WLAN/WiFi signals, determining changes in these signals due to reflection, refraction, and absorption, and calculating a chaos index to trigger notifications, allowing for automated movement detection without additional hardware or calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple sensors are deployed to cover a large indoor area, then detection coverage is improved, but device complexity and installation cost increase
Solution Approach 1:
The patent combines multiple detection functions into a single wireless device by utilizing both transmitted and received radio signals for movement detection. Instead of deploying multiple separate sensors, the system merges the functionality of transmission and reception into one device that can monitor movements across a large area through signal analysis.
Solution Approach 2:
The wireless device performs multiple functions simultaneously: it acts as both a radio signal transmitter and a movement detector. By analyzing the signals it receives from other devices, it can detect movements throughout the radio range without requiring additional specialized sensors, thus achieving multi-functionality.
2Speed
If traditional motion detectors are used for fast movement detection, then response speed is improved, but coverage area is limited to small indoor spaces
Solution Approach 1:
The patent replaces traditional mechanical or infrared motion detectors with a radio signal-based detection system. By using wireless communication signals (WiFi, WLAN) that naturally propagate through space, the system achieves fast detection response across large areas without being constrained by the limited range of traditional sensors.
3Reliability
If gas sensors are used for presence detection, then detection capability is improved, but response time increases significantly
Solution Approach 1:
The patent substitutes slow chemical gas sensors with fast radio signal-based detection. Radio signals provide immediate feedback about movements and presence, eliminating the minutes-long delay inherent in gas sensor response times while maintaining reliable detection capability.
4Use of energy by moving object
If equipment usage monitoring is used for presence detection, then energy efficiency is improved, but detection reliability decreases when no equipment is used
Solution Approach 1:
The patent introduces radio signals as an intermediary that continuously indicate presence regardless of equipment usage. Instead of relying on equipment state changes, the system uses the presence or absence of radio communications (or lack thereof) to reliably detect occupancy, maintaining both energy efficiency and detection reliability.
5Extent of automation
If scheduled programming is used for automation control, then automation capability is improved, but energy wastage occurs due to timing inaccuracies
Solution Approach 1:
The patent implements real-time feedback-based automation by continuously monitoring radio signal presence and immediately responding to actual occupancy conditions. Instead of relying on predetermined schedules, the system adjusts automation control based on real-time detection feedback, activating or deactivating systems only when actually needed, thus eliminating energy wastage from timing inaccuracies.
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
Enables reliable, automated, and energy-efficient movement detection across a large area using existing WLAN/WiFi devices, eliminating the need for multiple sensors and device carrying, with no calibration required, and allowing for remote monitoring and control of home automation systems.
Implementation Method 1
determining changes in these signals due to reflection, refraction, and absorption
Implementation Method 2
determining changes in these signals due to reflection, refraction, and absorption
Implementation Method 3
determining changes in these signals due to reflection, refraction, and absorption
Data Source
AI summary
In order to detect movements of objects and/or living beings in a radio range, which enables easily with a minimum of hardware complexity an automated movement detection based on a Single-Sensor, it is proposed to: Collect as input data for the movement detection based on received radio signals of an intended or unintended communication between a transmitting radio terminal being mobile or fixed and a receiving local fixed radio device in the radio range a set of “Channel State Information”-values, determine a change in the received radio signals, which are derived from the facts that the movement influences the transmitted radio signal in the radio range based on the collected CSI-values by the indication of a statistical parameter value, and assess on the basis of the statistical parameter value a “chaos index” value until the “chaos index” value in accordance with a threshold check provides a reliable statement.