Mobile Terminal Simulator Baseband Interface RF Elimination
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Solution Overview
Problem
Current mobile-terminal simulators for wireless telecommunications networks face challenges such as signal degradation, interference, and mechanical issues due to radio-frequency communication, leading to poor repeatability and increased complexity and cost.
Innovation Solution
A mobile-terminal simulator that communicates with radio base stations in baseband rather than radio frequency, using a software-defined-radio (SDR) platform and programmable protocol simulator to manage channel coding, error correction, and synchronization, eliminating the need for RF conversion and reducing mechanical complexities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If radio-frequency communication is used for simulator-base station communication, then the simulator can communicate with base stations, but signal degradation and interference occur leading to poor repeatability
Solution Approach 1:
The patent replaces the radio-frequency communication system with a baseband digital communication system. Instead of using RF modules that transmit electromagnetic signals through air (prone to degradation and interference), the simulator communicates directly with the baseband processor module of the base station through digital interfaces. This substitution of the communication medium eliminates atmospheric effects, signal attenuation, and electromagnetic interference, thereby achieving high repeatability and reliability in testing.
Solution Approach 2:
The patent introduces a baseband interface as an intermediary between the simulator and the RF module. The simulator generates baseband signals that are processed by the baseband processor module, which then converts them to RF signals for transmission. This intermediary approach allows the simulator to operate at a lower frequency level where signal integrity is maintained, avoiding the harmful effects of direct RF communication while still enabling full functionality through the baseband-RF conversion chain.
2Ease of operation
If radio-frequency modules and cables are used for high-frequency communication, then the simulator can connect to base stations, but mechanical problems and increased complexity occur
Solution Approach 1:
The patent extracts and removes the RF module from the simulator configuration. By eliminating the RF transmission and reception hardware, the patent removes the associated mechanical components such as high-frequency cables, connectors, and RF shielding. This extraction simplifies the simulator design to only include baseband processing components, which can be implemented using standard digital electronics and software, thereby reducing mechanical complexity and improving ease of operation.
Solution Approach 2:
The patent creates a virtual representation of the mobile terminal functionality through software simulation at the baseband level. Instead of physically implementing RF transceivers and antennas, the simulator uses software-defined radio techniques to replicate terminal behavior in the baseband domain. This virtual copying of terminal functions allows the simulator to operate without complex RF hardware while maintaining testing capability through digital signal processing and protocol simulation.
3Manufacturing precision
If RF communication is used, then the simulator can test base stations in realistic conditions, but signal interference and noise mask the useful signal
Solution Approach 1:
The patent applies preliminary signal processing and error correction techniques at the baseband level before signals are converted to RF for transmission to the base station. By implementing channel coding, cyclic redundancy checks, and error correction codes in the baseband domain, the system prepares signals to be robust against potential interference. This preliminary action ensures that even if RF interference occurs, the baseband processor can recover the original signal, thereby maintaining testing accuracy.
Solution Approach 2:
The patent replaces the vulnerable RF signal transmission path with a protected baseband digital communication path. By conducting all signal processing, modulation, and error correction in the baseband domain using digital logic and software, the system eliminates exposure to electromagnetic interference and noise that plagues RF communications. The digital baseband signals are inherently more resistant to degradation, ensuring high testing accuracy without the harmful effects of RF interference.
Data Source
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AI summary
A mobile-terminal simulator of a wireless telecommunications network includes a control module (15), a protocol simulator (16), and a baseband-modem module (17), coupled to the protocol simulator (16). The simulator is provided with a baseband interface (18) for coupling in communication the baseband-modem module (17) with a radio base station (3) of a wireless telecommunications system (1) with a low-frequency connection.