Mobile Terminal Test Device Frequency Characteristic Evaluation
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Solution Overview
Problem
Evaluating the frequency characteristics of the reception function of mobile communication terminals, particularly those receiving broadband signals, is challenging with existing methods, as they fail to effectively assess the frequency response of integrated components like amplifiers.
Innovation Solution
A mobile communication terminal test device and method that transmits a test signal divided into sub-frames and resource blocks, with varying radio resource regions in the frequency axis direction, allowing for the evaluation of frequency characteristics by receiving and converting response signals from the terminal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single component (amplifier) of the receiving unit is evaluated using a signal generator and spectrum analyzer, then the frequency characteristics of the component can be evaluated, but the frequency characteristics of the integrated reception function of the mobile communication terminal cannot be evaluated
Solution Approach 1:
The test signal is divided into multiple radio resource regions in the frequency axis direction, with each region corresponding to a specific frequency band. This segmentation allows the test device to evaluate the frequency characteristics of different bands separately while maintaining the ability to assess the integrated reception function of the mobile communication terminal.
Solution Approach 2:
The patent introduces a time-axis dimension by dividing the test signal into sub-frames and arranging radio resource regions in a two-dimensional time-frequency grid. This dimensional expansion enables the test device to systematically cover all frequency characteristics while maintaining manageable test complexity through structured signal organization.
2Productivity
If broadband signals are used to increase transmission rate, then multimedia services can be achieved, but frequency characteristics of the reception function become difficult to evaluate
Solution Approach 1:
The broadband test signal is segmented into multiple radio resource regions across different frequency bands. Each region can be independently analyzed for frequency characteristics while the overall structure supports broadband transmission rate evaluation, thus resolving the contradiction between high transmission rate and frequency characteristic measurability.
Solution Approach 2:
The test signal dynamically assigns different radio resource regions to different frequency bands across time intervals. This dynamic arrangement allows the system to maintain broadband transmission capabilities while systematically evaluating frequency characteristics of each band through time-varying signal placement.
3Ease of operation
If the position of radio resource region in frequency axis direction is fixed, then test signal transmission is simple, but frequency characteristics evaluation is incomplete
Solution Approach 1:
The patent makes the position of radio resource regions dynamic by varying them across different time intervals. This dynamic positioning ensures that all frequency characteristics are covered systematically while maintaining simple transmission procedures through automated signal generation and analysis.
Solution Approach 2:
The test signal employs periodic assignment of radio resource regions to different frequency bands across time intervals. This periodic action ensures comprehensive frequency characteristics evaluation while maintaining operational simplicity through repetitive, systematic testing patterns.
Data Source
AI summary
A mobile communication terminal test device includes: test signal transmitting means (40) for transmitting, to a mobile communication terminal (50), a test signal including a plurality of radio resource regions (1 to 8) each of which is surrounded by one or more sub-frames and one or more resource blocks; and response signal receiving means (14) for receiving a response signal to the test signal from the mobile communication terminal. The test signal transmitting means transmits, to the mobile communication terminal, the test signal which includes one radio resource region for each predetermined time interval (T) and in which the position of the radio resource region in the frequency axis direction varies for each predetermined time interval.