Mobile Terminal Testing Device Coarse Fine Grid Peak Power Detection
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Solution Overview
Problem
Current mobile terminal testing devices require a long time to measure reception power for various orientations due to the large number of measurement positions, leading to potential battery drain and reduced accuracy in detecting peak reception power, especially when using Coarse & fine grid measurements.
Innovation Solution
A mobile terminal testing device with a positioner and measurement control system that performs first and second rotation controls using coarse and fine grid patterns to selectively measure reception power, allowing for non-linear changes in the output level of the test signal to shorten measurement time and improve accuracy by targeting peak power candidates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If measurement is performed at all orientations using Constant Step type with 7.5° steps or Constant Density type with 800 points, then measurement precision of peak power is improved, but measurement time becomes excessively long (2 to 3 days)
Solution Approach 1:
The patent divides the measurement process into two distinct stages: a first stage using a Constant Step type grid with 7.5° steps to identify peak power candidates, and a second stage using a Constant Density type grid with 800 points to precisely determine the peak power. This segmentation allows the system to avoid performing exhaustive fine measurements at all orientations, thereby reducing total measurement time while maintaining accuracy through targeted fine measurements only at candidate positions.
Solution Approach 2:
The patent performs preliminary coarse measurements using the Constant Step type grid before conducting fine measurements. By first identifying peak power candidates through the coarser grid, the system prepares a limited set of positions where fine measurements are subsequently performed. This preliminary action eliminates the need to perform time-consuming fine measurements at all 800 positions, resolving the contradiction between measurement precision and time consumption.
2Productivity
If the number of measurement positions is reduced to shorten measurement time, then productivity is improved, but measurement precision of peak power detection deteriorates
Solution Approach 1:
The measurement process is segmented into coarse and fine stages, each serving a specific purpose. The coarse stage efficiently identifies candidate positions with minimal measurements, while the fine stage precisely determines peak power only at these candidates. This segmentation maintains high measurement precision while improving productivity by avoiding unnecessary fine measurements at non-candidate positions.
Solution Approach 2:
The patent applies different measurement densities to different spatial regions: a coarser grid is used for the entire spherical space to identify candidates, while a finer grid is applied locally only at the identified peak power candidate positions. This local quality approach ensures high precision where needed while maintaining overall efficiency, resolving the contradiction between productivity and measurement precision.
3Measurement precision
If Coarse & fine grid measurement is performed at all orientations, then peak power detection accuracy is improved, but device energy consumption increases due to extended measurement duration
Solution Approach 1:
The patent performs preliminary coarse measurements to identify peak power candidates before conducting energy-intensive fine measurements. By limiting fine measurements to only the candidate positions rather than all orientations, the system significantly reduces the total energy consumption while maintaining peak power detection accuracy. The preliminary action filters out positions where fine measurements are unnecessary.
Solution Approach 2:
Instead of performing complete fine measurements at all orientations (excessive action), the patent performs fine measurements only at the identified peak power candidate positions (partial action). This partial measurement approach is sufficient to achieve the required measurement precision while avoiding the excessive energy consumption that would result from measuring all orientations with the fine grid.
Data Source
AI summary
In an integrated control device 10 of the measurement device 1, a reception sensitivity test control unit 18 repeatedly performs a reception sensitivity test of measuring a throughput of a signal under measurement transmitted from a DUT 100 which has received a test signal while changing an output level of the test signal non-linearly for each of a first orientation (PSa) regulated by a predetermined step interval of a spherical coordinate system and a second orientation (PSb) regulated by a step interval finer than the predetermined step interval, and a peak power measurement control unit 19 sets, as a peak power candidate, reception power within a range of a power width (ΔPw) from the maximum reception power of reception power measured for each first orientation, measures the reception power for each second orientation with respect to the peak power candidate, and determines the peak power based on a measurement result.