Wireless Alarm Registration Frequency Selection
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Solution Overview
Problem
Radio hazard alarm systems face interference from foreign signals, leading to communication failures due to collisions in shared frequency channels, which shortens the service life of battery-operated devices and complicates installation processes, especially when multiple main stations and sub-stations need to be registered efficiently.
Innovation Solution
A method where the main station sends a presence signal to other main stations to announce its registration mode and select an undisturbed frequency range for communication, allowing secondary stations to register and switch to alternative channels if interference occurs, while pre-registering all detectors at the control panel in production to minimize installation disruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the system uses a fixed frequency channel for communication, then the device complexity is reduced, but the reliability deteriorates due to collisions with foreign radio signals
Solution Approach 1:
The system dynamically switches between multiple frequency channels based on detected interference levels. The main station monitors the service frequency channel and automatically transitions to alternative channels when collisions are detected, making the frequency selection adaptive rather than fixed.
Solution Approach 2:
The system changes the operating frequency parameter by switching between the service frequency channel and multiple alternative frequency channels. This parameter variation allows the system to avoid fixed-frequency collisions while maintaining operational simplicity.
2Reliability
If the system hops frequencies every 32 seconds to avoid interference, then the reliability improves, but the use of energy increases and service life decreases
Solution Approach 1:
The main station continuously monitors the noise level and collision status on the service frequency channel. Based on this feedback, the system determines when frequency hopping is necessary, avoiding unnecessary channel switches and reducing energy consumption while maintaining reliability.
Solution Approach 2:
The system performs periodic monitoring of the service frequency channel conditions. Instead of continuous hopping, the system checks interference levels at intervals and only switches channels when collisions are detected, reducing the frequency of energy-intensive operations.
3Adaptability or versatility
If multiple main stations are installed in the same building, then the coverage and functionality improve, but the device complexity increases due to channel selection conflicts
Solution Approach 1:
The frequency spectrum is segmented into a service frequency channel and multiple alternative frequency channels. This segmentation allows multiple main stations to operate in the same building by distributing them across different frequency channels, reducing conflicts.
Solution Approach 2:
Each main station autonomously monitors its own service frequency channel and automatically selects alternative channels when conflicts are detected. This self-service mechanism eliminates the need for manual channel assignment and reduces the complexity of managing multiple stations.
4Area of stationary object
If the service frequency channel is occupied by external systems, then the installation range is limited, but the ease of operation deteriorates due to manual frequency configuration requirements
Solution Approach 1:
The system automatically monitors the service frequency channel and selects alternative channels when external interference is detected. This eliminates the need for manual frequency configuration by installers, as the system self-adjusts to available channels.
Solution Approach 2:
The system pre-configures multiple alternative frequency channels alongside the service frequency channel. When interference is detected, the system can immediately switch to pre-prepared alternative channels, ensuring continuous operation without manual intervention.
Data Source
Figure 1a
Figure 1b
AI summary
The method involves sending a signal indicating readiness to a main station (M1) after switching-on the main station. Access to the main station is denied in an announcement mode until additional main stations do not report the announcement mode, where the main station occupies a frequency range that is free and undisturbed. The main station is switched to the announcement mode, where the main station provides an announcement mode signal to the additional main stations. Service frequency channels are arranged in the main station. An independent claim is also included for a hazard alert system for radio transmission of alarm data.