HVAC Thermostat Mesh Network Interference Avoidance
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Solution Overview
Problem
Existing HVAC systems with wireless mesh networks face limitations in the number of thermostats due to interference between nearby networks, which can lead to communication failures or reduced reliability due to unsynchronized radio transmissions.
Innovation Solution
Implementing synchronization between root nodes of multiple wireless mesh networks using a common real-time signal, such as the NIST time, to assign time slots and offset high traffic periods, reducing the likelihood of interference by ensuring that nodes in different networks transmit data at non-overlapping times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple wireless mesh networks are deployed in proximity to expand HVAC system coverage, then the number of thermostats and nodes increases, but radio interference between networks increases causing communication failures and reduced reliability
Solution Approach 1:
The patent implements periodic time-slot assignment where each mesh network transmits in alternating time periods. Root nodes synchronize transmissions using a common real-time signal (such as NIST time) and assign time slots to avoid simultaneous transmissions. This periodic action reduces radio interference between proximate networks while maintaining expanded system coverage and increased number of thermostats.
2Reliability
If thermostats communicate periodically every fifteen seconds to check component status, then system monitoring is improved, but network traffic volume increases causing interference between nearby networks
Solution Approach 1:
The patent coordinates periodic communications by assigning time slots based on synchronization to a common real-time signal. Thermostats transmit status information every fifteen seconds, but transmissions are staggered across different time slots to avoid simultaneous radio traffic. This maintains continuous system monitoring while reducing cumulative radio interference between proximate networks.
Solution Approach 2:
The patent introduces a synchronization mechanism using a common real-time signal (such as NIST time) as an intermediary between root nodes of different mesh networks. This intermediary coordinates the timing of periodic transmissions, allowing thermostats to maintain regular monitoring cycles while avoiding radio interference through synchronized time-slot assignment.
3Ease of manufacture
If wireless mesh networks operate without synchronization to simplify deployment, then ease of installation is improved, but transmission collisions and interference increase reducing bandwidth
Solution Approach 1:
The patent implements self-service synchronization where root nodes automatically synchronize to a common real-time signal (such as NIST time) without requiring complex manual configuration. The system self-adjusts time slots and transmission schedules based on the synchronized clock, maintaining deployment simplicity while eliminating transmission collisions and maximizing bandwidth efficiency.
Data Source
AI summary
An apparatus and/or method is described providing for expansion of the number of nodes in an HVAC thermostat control network utilizing a wireless mesh network beyond the limits of a single mesh network by utilizing a synchronization signal to offset periods of high wireless mesh network traffic.