TETRA Single-Frequency Radio Network Device for In-Building Coverage
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Solution Overview
Problem
Current digital trunked radio systems, particularly TETRA, face challenges in providing effective in-building coverage due to limited range and the need for costly infrastructure upgrades, with no satisfactory solution for digital single-frequency radio networks, leading to high renewal and replacement costs.
Innovation Solution
A TETRA-DMO single-frequency radio network device comprising a central radio network control device and radio cell devices for synchronized digital signal transmission and reception, using digitally compatible downlink and uplink units, and A/D conversion to enable reliable and efficient digital communication within a single frequency system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital trunked radio systems (TETRA) are deployed to provide in-building coverage, then communication reliability is improved, but infrastructure cost increases due to need for costly upgrades and replacement
Solution Approach 1:
The patent applies the copying principle by using analog signal processing techniques in a digital radio system. The master control unit receives digital signals, converts them to analog form, processes them through analog signal paths, and then converts them back to digital for distribution to slave units. This allows the system to achieve digital communication reliability while utilizing proven analog infrastructure, thereby reducing overall system cost.
Solution Approach 2:
The patent segments the radio network into a master control unit and multiple slave units. The master unit handles signal reception, conversion, and control functions, while slave units handle transmission and local signal distribution. This segmentation allows the system to be deployed incrementally and reduces the complexity and cost of infrastructure upgrades compared to replacing entire digital systems.
2Ease of manufacture
If analog single-frequency networks are used for in-building coverage, then infrastructure cost is reduced by maintaining existing infrastructure, but digital signal compatibility is lost
Solution Approach 1:
The patent changes the signal processing parameters by introducing analog-to-digital and digital-to-analog conversion stages. The master control unit receives digital signals from terminals, converts them to analog parameters suitable for processing through the existing analog infrastructure, and then converts them back to digital form for distribution to slave units. This parameter transformation enables the system to maintain compatibility with existing analog infrastructure while fully supporting digital signal processing and communication.
3Area of stationary object
If TETRA repeaters are deployed to extend range, then coverage area is improved, but system complexity increases due to need for multiple repeaters and coordination
Solution Approach 1:
The patent merges the functions of multiple repeaters into a single master control unit that coordinates signal distribution to multiple slave units. Instead of having each repeater independently process and retransmit signals, the master unit receives signals from terminals, processes them centrally, and distributes them to slave units which then transmit to extend coverage. This merging of control functions reduces system complexity while maintaining extended coverage capability.
Data Source
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AI summary
The device has a central radio network-control device (11) and two radiocell devices (10) for common wave-radio communication of digital signal based terminal. Two radiocell devices are provided for digital coded radio signals, and stay with the control devices for synchronized radiation of the digital receiving signals of the terminal received by the radiocell devices over communication connection (12) in a controlled communication. The digital receiving signals of the terminal are received by the radiocell devices. Independent claims are also included for the following: (1) a method for operating the terrestrial trunked radiocommon-wave-radio network device; and (2) a method for upgrading of an existing analog common-wave-radio device in a terrestrial trunked radio network device.