VHF-UHF Dual-Band Meter Reading Network
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Solution Overview
Problem
Current remote reading systems for fluid meters face limitations in continuous monitoring and high operational costs due to the need for multiple connection points and low data rate transmission, which complicates network maintenance and reduces the number of meters that can be connected.
Innovation Solution
A fixed communication network using radio modules operating in the VHF frequency band for meter-to-concentrator communication and UHF frequency band for concentrator-to-server communication, allowing for optimized range and high data rate transmission with fewer connection points, utilizing frequencies such as 169 MHz for VHF and 868 MHz for UHF.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If VHF link is used for meter-to-concentrator communication to optimize range, then communication range is improved, but data transmission rate deteriorates
Solution Approach 1:
The communication network is segmented into two distinct parts: VHF link for meter-to-concentrator communication (prioritizing range) and UHF link for concentrator-to-server communication (prioritizing data rate). This segmentation allows each segment to be optimized independently for its specific function, resolving the contradiction between range and data rate.
Solution Approach 2:
Different frequency parameters are used for different communication segments: VHF frequencies (lower frequency, longer wavelength) for range-optimized meter-to-concentrator links, and UHF frequencies (higher frequency, shorter wavelength) for data rate-optimized concentrator-to-server links. This parameter change resolves the contradiction by matching frequency characteristics to communication requirements.
2Area of stationary object
If multiple concentrators are deployed to cover larger areas, then coverage area is improved, but network complexity deteriorates
Solution Approach 1:
The network is segmented into autonomous concentrator units that each independently manage their local VHF meters and communicate with the server via UHF. This segmentation reduces overall network complexity by distributing intelligence to individual concentrators rather than requiring complex centralized management of all devices.
Solution Approach 2:
Each concentrator is designed as a universal node that performs multiple functions: receiving VHF signals from meters, processing the data, and transmitting via UHF to the server. This multi-functionality reduces the need for specialized devices and simplifies network deployment and maintenance.
3Length of stationary object
If low data rate transmission is used to optimize VHF link range, then communication range is improved, but the number of meters that can be connected deteriorates
Solution Approach 1:
The system segments the communication burden by using VHF for slow-range meter-to-concentrator links and UHF for fast concentrator-to-server links. This allows many meters to connect to concentrators via VHF while the high-capacity UHF link handles the aggregate data traffic to the server, resolving the contradiction between range and connected device capacity.
Solution Approach 2:
Concentrators act as intermediary devices that aggregate data from multiple VHF meters and then transmit the consolidated data via UHF to the server. This intermediary function allows many low-data-rate VHF connections to be supported while maintaining high overall system throughput through the UHF link.
Data Source
AI summary
Transmission method for remote reading of fluid meters according to which a meter comprises a module (?31), (E32), (E33), (E34), (E35) capable of transmitting, in the VHF frequency band, a remotely read data frame to a server (E1) comprising a radio receiver capable of receiving in the UHF frequency band. According to said method, a concentrator (E21), (E22) receives the data frame from the module (E31), (E32), (E33), (E34), (E35) in the VHF frequency band and transmits said data frame in the UHF frequency band to the server (E1).