Wireless Security Panel Superframe Synchronization
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Solution Overview
Problem
Existing fire system warning device activation methods, particularly those using wireless transceivers, often introduce synchronization delays and require complex wired connections, leading to inefficient and potentially unreliable notification systems.
Innovation Solution
A security system utilizing a control panel that sends activation messages within a repeating superframe structure, allowing wireless synchronization of warning devices through a timing table, eliminating the need for wired connections and ensuring synchronized audible and visual alerts across the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If wireless transceivers are used to reduce installation costs, then device complexity is reduced, but synchronization delays occur leading to unreliable notification
Solution Approach 1:
The system pre-assigns specific time slots to each notification device in a repeating superframe structure before activation occurs. This preliminary timing assignment ensures that when activation commands are sent, each device knows exactly when to activate based on its pre-assigned slot, eliminating synchronization delays and ensuring reliable simultaneous activation across all devices without requiring complex real-time coordination
Solution Approach 2:
The control panel tracks the status of each notification device and uses this information to determine optimal activation timing. By monitoring device availability and status, the system can send activation commands at the most appropriate time, ensuring synchronized activation while working within the constraints of the wireless mesh network
2Adaptability or versatility
If mesh network relay is used to extend wireless coverage, then adaptability is improved, but activation delays increase causing unsynchronized warning devices
Solution Approach 1:
The system establishes a complete timing schedule in advance through the repeating superframe structure, assigning each device its activation slot before any activation event occurs. This pre-planned approach allows messages to be relayed through the mesh network without causing delays, as each device already knows its predetermined activation time and can synchronize accordingly regardless of message transmission path
Solution Approach 2:
The system uses a repeating superframe structure with periodic time slots assigned to each notification device. This periodic timing framework ensures that activation commands sent through the mesh network are delivered and executed in a synchronized manner, as all devices operate according to the same repeating time schedule, eliminating delays caused by message relaying
3Reliability
If constant communication is maintained between control panel and warning devices, then reliability is improved, but energy consumption increases
Solution Approach 1:
The system uses periodic superframes with predetermined time slots instead of maintaining constant communication. Notification devices can sleep between superframes, waking only to listen for activation commands in their assigned slots. This periodic communication approach maintains reliability by ensuring devices are available at known intervals while dramatically reducing energy consumption compared to constant monitoring
Solution Approach 2:
The system pre-assigns time slots and establishes communication schedules before operation begins. This preliminary setup allows devices to know exactly when to wake and listen for commands, eliminating the need for constant communication while maintaining reliable activation. Devices can remain in low-power state between predetermined communication windows
Data Source
Figure 1~2
AI summary
An apparatus including a control panel (18) of a security system (10) that protects a secured geographic area, a plurality of sensors (12, 14), a plurality of annunciators (22, 24), a processor (26) that wirelessly exchanges information with the sensors and annunciators based upon a timing table (36) defining a repeating superframe having a plurality of non-overlapping time periods including at least one response period, at least one request period and at least one silent period, a processor (28) of the control panel that transmits an activation message to one of the plurality of annunciators within the response period and a processor of the at least one annunciator that processes the activation message and then directly synchronizes an audio or visible output of the at least one annunciator to a subsequent one of the plurality of non-overlapping time periods.