Bidirectional Redundant Mesh Networks for Fire and Security Systems
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Solution Overview
Problem
Conventional fire and security systems employing mesh networks with single controllers are prone to single-point failures, leading to potential loss of communications in protected areas, necessitating a solution for diagnosing and mitigating such failures.
Innovation Solution
The implementation of bidirectional mesh networks with multiple controllers and redundant communications paths, utilizing a combination of wireless and wired elements, where each controller determines parent/child relationships and communicates via a unique time slotted or frequency allocation method, ensuring all elements receive messages redundantly and can retransmit them on different paths to prevent communication loss even if one controller fails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single controller is used in the mesh network, then the device complexity is reduced, but the reliability deteriorates due to single-point failure
Solution Approach 1:
The system divides the controller functionality into multiple independent controller modules (first controller, second controller, etc.) that can operate autonomously. Each controller manages a portion of the mesh network, eliminating the single-point failure problem while maintaining manageable complexity through modular design
Solution Approach 2:
The system changes the operational parameters by implementing time-slotted communication protocols and frequency allocation methods that allow multiple controllers to coexist without interference. This parameter-based coordination enables reliable multi-controller operation
2Reliability
If redundant communication paths are implemented, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The system implements dynamic path selection where communication routes are automatically adjusted based on real-time network conditions and controller availability. This dynamic routing provides redundancy without requiring complex static configuration of multiple physical paths
Solution Approach 2:
The mesh network elements act as intermediaries that automatically route messages between controllers and end devices. These intermediary elements simplify the overall network configuration by handling path selection and message forwarding transparently
3Reliability
If multiple controllers communicate via unique time slotted or frequency allocation methods, then the reliability is improved through redundancy, but the use of energy increases due to multiple communication channels
Solution Approach 1:
The system uses periodic time-slotted communication where controllers transmit at specific intervals rather than continuously. This periodic operation reduces overall energy consumption while maintaining reliable communication through scheduled redundant transmissions
Solution Approach 2:
The communication protocol is designed to be universal across all controllers, allowing the same time-slotted or frequency allocation method to serve multiple functions: establishing initial connections, transmitting data, and providing redundant backup channels
Data Source
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AI summary
A redundant mesh communications network uses multiple controllers, or controller gateways to route messages and to monitor the integrity of wired and wireless mesh system elements. The multiple control units and multiple paths provide various redundant communications solutions thereby avoiding a single point of failure in the network.