Hands-Free Alarm Disarming With Door-Triggered RF Authentication
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Solution Overview
Problem
Security monitoring systems face challenges in hands-free disarming, especially for individuals who are elderly or infirm, as they need to manually enter a code at a disarm node, which can be inconvenient, especially when carrying items or using crutches.
Innovation Solution
A security monitoring system that includes a central unit with a radio frequency transceiver, a door sensor, a disarm node with a user interface and RF transmitter, and a portable authentication device, allowing for hands-free disarming by transmitting a wake-up signal to the portable device upon door opening, which then sends a disarm signal to the central unit if within range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual code entry at a fixed disarm node is required, then system security is maintained, but ease of operation deteriorates for elderly or infirm users carrying items
Solution Approach 1:
The patent replaces the mechanical/manual code entry system with a wireless RF-based automatic authentication system. The portable authentication device communicates with the disarm node via radio frequency, eliminating the need for manual keypad entry and allowing hands-free operation while maintaining security through authenticated device recognition.
Solution Approach 2:
The patent introduces a portable authentication device as an intermediary between the user and the disarm node. This device carries the authentication credentials and automatically transmits them to the disarm node, serving as a mediator that enables convenient access while preserving security protocols.
2Speed
If the portable authentication device wakes up continuously to check for disarm signals, then responsiveness improves, but battery consumption increases
Solution Approach 1:
The patent implements periodic wake-up cycles where the portable authentication device remains in a low-power sleep state and periodically wakes to check for disarm signals from the disarm node. This periodic action balances responsiveness with battery conservation, as the device only consumes significant power during brief wake intervals rather than continuously.
Solution Approach 2:
The portable authentication device autonomously manages its own power state, automatically waking and sleeping based on received signals from the disarm node. The device serves itself by intelligently determining when to activate its radio transmitter based on the presence of wake-up signals, eliminating the need for continuous operation.
3Ease of operation
If the disarm node transmits wake-up signals to all portable devices, then ease of operation improves, but security deteriorates by allowing disarming from any location
Solution Approach 1:
The patent applies local quality by making the authentication process location-specific. The disarm node transmits wake-up signals that are only valid when the portable authentication device is in close proximity to the disarm node itself. This creates a localized authentication zone near each door, ensuring that disarming can only occur at the appropriate location rather than from anywhere in the premises.
Solution Approach 2:
The portable authentication device acts as an intermediary that verifies proximity to the disarm node. The device must be physically present near the disarm node to receive and respond to wake-up signals, serving as a mediator that enforces location-based security while enabling hands-free operation when properly positioned.
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 convenient hands-free disarming while maintaining security by ensuring only devices near the relevant door can disarm the system, reducing battery drain on disarm nodes and improving security by targeting specific disarm nodes for each door.
Implementation Method 1
a radio frequency transceiver; a radio frequency transmitter to transmit, in consequence of the user input, a disarm signal to the central unit; the portable authentication device including a radio transceiver
Data Source
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AI summary
A security monitoring system (100) for a building (110) or a secured space within a building, the system including: a central unit (140) for controlling, arming and disarming the security monitoring system, and having a radio frequency transceiver; a door sensor (130) to detect the opening of a door giving access to the building or the secured space; a disarm node (270) for disarming the system, the node having a user interface to receive a user input to disarm the system, and a radio frequency transmitter to transmit, in consequence of the user input, a disarm signal to the central unit; and a portable authentication device to permit hands-free disarming of the security monitoring system, the portable authentication device including a radio transceiver and having a portable authentication device identity that is registered with the central unit; the central unit being configured: in response to receiving a door opening indication/message from the door sensor, to: start an entry period timer; transmit a wake up message, including a disarm transmission identifier, to the disarm node to cause the RF transmitter of the disarm node to transmit a wake up signal/beacon, including the disarm transmission identifier received from the central unit, to wake the portable authentication device; and in response to receiving, before expiry of the entry period timer, a radio frequency disarm signal from the portable authentication device that includes the registered portable authentication device identity and the disarm transmission identifier, to disarm the security monitoring system; and in the event that the security monitoring system is not disarmed before expiry of the entry period, to cause the security monitoring system to enter an alarm state; wherein, additionally either: the central unit is configured to start a hands-free disarm timer in response to receiving a door opening indication from the door sensor, and in the event that no RF signal including the registered portable authentication device identity and the disarm transmission identifier is received before the hands-free disarm timer expires, to transmit a signal to the disarm node to cause the disarm node to provide a user notification to the effect that the attempted hands-free disarm has failed; or the disarm node is configured to start its own hands-free disarm timer in response to receiving the wake up message from the central unit, and, in the event that the hands-free disarm timer of the disarm node expires without the disarm node having been informed by the central unit of a disarming of the security monitoring system, to provide a user notification to the effect that the attempted handsfree disarm has failed.