DECT Motion Detection via RSSI Analysis
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Solution Overview
Problem
Existing motion sensing technologies based on radio signals face challenges in accurately detecting motion in multipath environments due to signal attenuation and reflection, which can lead to false or missed detections.
Innovation Solution
A digital enhanced cordless telecommunication (DECT) system that uses a DECT base station and handset to transmit and receive beacon signals, processing changes in received signal strength indication (RSSI) to detect motion by analyzing intensity changes between different signal components, and sending alerts or responses through alternative communication channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If motion sensing is performed using radio signal blocking and reflection in multipath environments, then motion detection capability is provided, but false or missed detections occur due to signal attenuation and reflection
Solution Approach 1:
The system continuously monitors RSSI values from periodic beacon signals and compares them against threshold values to detect motion. The feedback loop involves receiving beacon signals, measuring RSSI, comparing with thresholds, and triggering motion detection alerts when conditions are met, enabling reliable motion sensing despite multipath effects
Solution Approach 2:
The system changes the parameter being monitored from raw signal amplitude to RSSI (Received Signal Strength Indication) values derived from periodic beacon signals. By analyzing changes in RSSI over time rather than direct signal amplitude, the system achieves more reliable motion detection that is less susceptible to multipath interference
2Reliability
If additional motion sensing hardware is deployed, then motion detection capability is improved, but system cost and complexity increase
Solution Approach 1:
The DECT base station and handset devices perform dual functions: traditional telecommunication operations and motion sensing. The existing DECT hardware (transmitters, receivers, processors) is utilized for both voice communication and motion detection, eliminating the need for separate motion sensing hardware and reducing system complexity
Solution Approach 2:
The DECT system provides motion sensing capability using its own existing infrastructure. The base station and handsets use their built-in transmitters and receivers to perform both communication and motion detection functions, making the system self-sufficient and avoiding additional hardware requirements
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 real-time motion detection within a close environment without additional hardware, providing a cost-effective home security feature by leveraging existing DECT network components and software, effectively distinguishing between motion and environmental changes.
Implementation Method 1
a radio transmitter that transmits a constant pattern, a radio receiver, and a processing unit
Implementation Method 2
An object that is located somewhere along the propagation path of a radio signal may affect the overall propagation path of the signal, as it may attenuate, block, or reflect certain parts of the signal
Implementation Method 3
An object that is located somewhere along the propagation path of a radio signal may affect the overall propagation path of the signal, as it may attenuate, block, or reflect certain parts of the signal
Implementation Method 4
a receiver that is tuned to receive the said radio signal receives the superposition of all signal paths—resulting in possible decay or intensification of the signal amplitude depending on the phase of each individual component
Data Source
AI summary
A digital enhanced cordless telecommunication (DECT) base station, the DECT base station may include a transmitter that is arranged to transmit, at different points of time, downlink transmitted DECT signals to another DECT device that differs from the DECT base station; a receiver that is arranged to receive from the other DECT device downlink reception information indicative of attributes of downlink received DECT signals that were received by the other DECT device as a result of the transmission of the downlink transmitted DECT signals; a processor that is arranged to process the downlink reception information to detect a motion that affects a reception of the downlink received DECT signals by the other device.