BLE Mesh Network Bridge for High-Density Warehouse Sensor Scaling
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Solution Overview
Problem
Current wireless sensor networks lack the necessary scalability, reliability, high data rate, and low power consumption required for high-density deployments in industrial applications such as warehouse inventory management, where existing technologies do not adequately meet the demands of high-density deployments with over 5 nodes per cubic meter and more than 5000 nodes in a local network.
Innovation Solution
A wireless sensor network utilizing a Bluetooth Low Energy (BLE) mesh network with a duty cycle of less than 10% for battery-powered modules to minimize power consumption and up to 100% for mains-powered modules to enhance response time, featuring a bridge device that retransmits messages through multiple radios, allowing for high efficiency and scalability, and enabling easy addition or removal of mesh modules without altering the network structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the duty cycle of mesh modules is reduced to save energy, then power consumption decreases, but response time increases
Solution Approach 1:
The mesh modules operate with a duty cycle of less than 10%, switching between active and sleep states periodically. This periodic operation significantly reduces power consumption while the bridge device compensates by retransmitting messages during the mesh module's active periods, ensuring reliable communication without requiring the mesh module to remain continuously active.
2Quantity of substance
If the number of mesh modules is increased to achieve high-density deployment, then network coverage and scalability improve, but network complexity increases
Solution Approach 1:
The bridge device serves as an intermediary between the control device and multiple mesh modules. It receives messages from the control device and retransmits them through multiple radios to the appropriate mesh modules, thereby simplifying the network architecture and reducing the complexity that would otherwise arise from direct peer-to-peer connections among numerous nodes.
Solution Approach 2:
The network is segmented into distinct functional components: control devices for management, bridge devices for message distribution, and mesh modules for sensing and actuation. This segmentation allows each component to perform its specific function efficiently, making the overall large-scale network easier to manage and scale.
3Reliability
If message retransmission through multiple radios is implemented to ensure reliable delivery, then communication reliability improves, but device complexity increases
Solution Approach 1:
The bridge device dynamically selects which radios to use for message retransmission based on the current network state and the target mesh module's location. This dynamic adaptation allows the system to maintain high reliability while avoiding the need for all possible radio combinations to be configured simultaneously, thereby managing device complexity effectively.
Data Source
AI summary
A wireless sensor network includes an aggregator, a control device, a bridge device, and a mesh module. The control device is connected with the aggregator and the bridge device. The mesh module is wirelessly connected with the bridge device and the control device. A mesh network is built by the connections of the mesh module, the bridge device, and the control device. A duty cycle of the mesh module is less than or substantially equal to 10 percent. A command sent by the aggregator is converted into a wireless message by the control device, the wireless message is transmitted by the control device and retransmitted through a first amount of radios and repeated for a second amount of times by the bridge device, so that the wireless message is successfully received by the mesh module. Therefore, a mesh network with high efficiency and low cost is achieved.