Alarm Device Cellular Network Roaming Reliability
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Solution Overview
Problem
Existing alarm devices often lack reliable communication methods, especially in situations where access to the Public Switched Telephone Network (PSTN) is not possible, and there is a need for status information on the operation of these devices to ensure proper functioning and prevent false alarms.
Innovation Solution
An alarm device that surveys available cellular networks, selects the most reliable one based on communication reliability, and establishes a connection using a roaming SIM to ensure consistent and secure communication of alarm signals and status information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If alarm devices use PSTN for communication, then communication with remote location is established, but the device cannot be deployed where PSTN access is not possible
Solution Approach 1:
The patent changes the communication parameter from PSTN-based to cellular network-based communication. The alarm device uses a cellular module to establish communication through mobile networks instead of traditional telephone lines, enabling deployment in locations without PSTN access while maintaining reliable communication capability through network-based messaging
Solution Approach 2:
The patent introduces a cellular network as an intermediary between the alarm device and the remote location. The cellular module acts as a mediator that translates alarm signals into network-based messages, allowing communication over mobile networks instead of direct PSTN connections, thus providing both flexibility and reliability
2Adaptability or versatility
If alarm devices use cellular networks for communication, then deployment flexibility is improved, but communication reliability is insufficient for security applications
Solution Approach 1:
The patent implements feedback mechanisms where the alarm device periodically sends status information to verify communication connectivity. The system monitors communication quality and can detect when network conditions are insufficient, allowing the device to adjust its behavior or alert the user to potential communication issues, thereby maintaining high reliability standards
Solution Approach 2:
The patent performs preliminary actions by establishing and testing communication links before actual alarm events occur. The device conducts initial network registration and communication tests to ensure reliability is established beforehand, preventing false alarms and ensuring secure communication channels are in place before needed
3Device complexity
If alarm devices do not provide status information, then device complexity is reduced, but the operator cannot determine if the device is operating correctly
Solution Approach 1:
The patent implements self-service by having the alarm device automatically generate, transmit, and manage its own status information without operator intervention. The device autonomously monitors its operational state and communication quality, then self-reporting through the cellular network, reducing complexity while enabling continuous verification of correct operation
Data Source
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AI summary
A method of operating an alarm device arranged to transmit an alarm signal indicative of an alarm condition having been met is described. The method involves the alarm device carrying out the following steps. The alarm device accesses a record of a list of cellular networks available for communication with the device. The record includes information identifying each of the networks and a measure of the reliability of communication over each network. The device selects a network with which to establish a communication link based on the measure of the reliability of communication over the network, and attempts to establish a communications link with the selected network.