Software Defined Radio Time-Multiplexed Mesh Network Bandwidth
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Solution Overview
Problem
RF mesh networks in building automation face challenges in maintaining bandwidth and synchronizing mobile device links due to near-field effects, leading to reduced available bandwidth and potential disconnection from room-level information updates.
Innovation Solution
Implementing a time-multiplexed communication scheme using a software definable radio that switches between IEEE 802.15.4 and Bluetooth Low Energy (BLE) modes, allowing the system to prioritize room-level mesh network traffic and maintain connectivity with mobile devices without impairing the mesh network's bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a secondary RF link is added to allow mobile device interaction at room level, then connectivity to mobile devices is improved, but near-field effects cause transmission interference that reduces mesh network bandwidth
Solution Approach 1:
The system implements time-division multiplexing where the RF link periodically switches between mesh network mode and mobile device mode. During mesh network time slots, the radio operates at full power for mesh communication. During mobile device time slots, the radio switches to BLE or secondary RF mode for mobile device interaction. This periodic switching eliminates near-field interference while maintaining both connectivity functions.
2Reliability
If time slots are assigned for each mode of operation to avoid interference, then transmission interference is reduced, but available bandwidth for each application is reduced
Solution Approach 1:
The system dynamically adjusts time slot allocation based on real-time network conditions and traffic requirements. When mobile device interaction is needed, the system dynamically switches to BLE mode during designated time slots. When mesh network traffic is prioritized, the system allocates more time slots to mesh communication. This dynamic allocation optimizes bandwidth utilization while preventing interference.
3Adaptability or versatility
If the radio is operated to service the mobile device, then mobile device connectivity is improved, but the mesh network may not concurrently receive updates
Solution Approach 1:
The system schedules mesh network status updates to occur in predetermined time slots before mobile device service time slots begin. This ensures that all mesh network devices receive necessary updates before the radio switches to mobile device mode. Buffering mechanisms store updates for devices that miss transmission windows, ensuring no information is lost.
Data Source
AI summary
A communication system that may be used in room and building automation. A mesh network may be associated with a room of a building, or the like. Connectivity may be provided for devices with servers and a cloud in one mode. Connectivity may be provided for devices to mobile devices and a room-level information module in another mode. These modes of connectivities of various modes may be effected with a software definable radio or radios. Other modes of connectivity may be implemented. Examples of modes may incorporate Bluetooth low energy (BLE) and non-BLE formats. The modes may be multiplexed to operate one at a time and be switched back and forth as needed.