Base Station Digital Modem with Remote RF Units
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Solution Overview
Problem
Conventional repeater systems for mobile communication are costly to install and maintain, and they cannot extend wireless channel capacities, limiting their ability to provide high-quality signal transmission and flexible coverage.
Innovation Solution
A base station system using a digital modem unit interconnected with remote RF unit hubs via Ethernet using twisted pair cables, allowing for the transmission of high-quality signals between a base station and remote RF units, which can be easily and cheaply installed, and enabling flexible extension of wireless channel capacity and coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional repeater systems use optical lines or coaxial cables, then signal transmission quality is improved, but installation cost and complexity increase
Solution Approach 1:
The patent replaces expensive optical lines or coaxial cables with inexpensive twisted pair cables for connecting remote RF units to the base station. While twisted pair cables have higher attenuation than optical fibers, the system compensates through digital signal processing and remote unit placement near mobile terminals, achieving acceptable signal quality at much lower installation and maintenance costs
Solution Approach 2:
The base station system is divided into a base station part and multiple remote RF units that can be independently deployed. Each remote RF unit functions as an independent transceiver connected via simple twisted pair cables, allowing flexible installation without requiring complex centralized infrastructure like optical lines
2Area of stationary object
If conventional repeater systems are deployed, then coverage extension is achieved, but wireless channel capacity cannot be extended
Solution Approach 1:
The remote RF units are designed as multi-functional devices that can provide both coverage extension and wireless channel capacity enhancement. Each remote unit acts as an independent base station capable of handling multiple communication channels, allowing the system to simultaneously expand coverage area and increase overall network capacity through parallel channel operation
3Adaptability or versatility
If remote RF units are installed far from the base station, then coverage flexibility is improved, but signal transmission quality deteriorates
Solution Approach 1:
The patent replaces traditional electrical signal transmission over long distances with digital data transmission through twisted pair cables connecting remote RF units. The base station transmits digital baseband signals or intermediate frequency signals to remote units, which then convert to RF signals locally, eliminating the need for high-quality analog signal transmission over long distances and enabling flexible remote deployment
Data Source
AI summary
A base station system for mobile communication between a mobile terminal and a base station controller, the base station system utilizing a digital modem unit for receiving a signal to be transmitted to the mobile terminal from the base station controller, framing the received signal according to a frame format for transmission different than an Ethernet specified data format, the frame format being a predetermined remote RF (radio frequency) unit frame, the digital modem unit transmitting a plurality of the remote RF unit frames in series over an Ethernet using twisted pair cable, at least one remote RF unit hub receiving the remote RF unit frames transmitted by the digital modem unit and distributing the received remote RF unit frames to a plurality of remote RF units via the Ethernet using twisted pair cable, and the plurality of remote RF units producing a deframed signal by deframing the remote RF unit frames received from the remote RF unit hub, modulating the deframed signal to an RF signal, and transmitting the RF signal to the mobile terminal, wherein the remote RF unit frames are divided into a traffic frame for use in transmitting traffic data, which is transmitted and received by the mobile terminal and a control frame for use in transmitting a control address and control data, the control address differentiating the plurality of remote RF units from one another, the control data containing a command to control operation and functions of the plurality of remote RF units.