Mobile Terminal Testing Device Adaptive Output Level Control
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Solution Overview
Problem
Existing mobile terminal testing devices require a long time to control the output level of test signals for reception sensitivity tests, leading to prolonged test durations.
Innovation Solution
A mobile terminal testing device that sets a predetermined error tolerance level and adjusts the output level of test signals based on throughput measurements, performing level down or level up in units of the error tolerance level when the throughput drops to a steep drop region, thereby reducing the number of transmissions and receptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sequential change by constant level is used to maintain output level according to standard, then measurement precision is improved, but test time increases
Solution Approach 1:
The patent applies dynamics by changing the output level adjustment strategy from static sequential constant steps to dynamic adaptive steps. The system dynamically adjusts the output level based on real-time throughput measurements, using larger steps when throughput is high and smaller steps when throughput is low, thereby optimizing both speed and precision.
Solution Approach 2:
The patent implements feedback by continuously monitoring throughput during the test and using this information to adjust the output level. The system measures throughput at each output level and uses this feedback to determine the next output level, creating a closed-loop control system that adapts to actual device performance.
2Measurement precision
If output level is adjusted in small units to ensure precision, then measurement precision is improved, but productivity decreases
Solution Approach 1:
The system dynamically adjusts the output level step size based on throughput conditions. When throughput is high (indicating the device can handle stronger signals), larger step sizes are used to quickly reach the target output level. When throughput is low, smaller step sizes are used to maintain precision, thus adapting the granularity to actual device capability.
Solution Approach 2:
The patent changes the parameter of output level step size based on throughput measurements. Instead of using a fixed small step size throughout the test, the system varies the step size parameter dynamically, using larger steps when appropriate and smaller steps when precision is critical, thereby optimizing both speed and accuracy.
3Measurement precision
If multiple transmissions and receptions are performed for accurate measurement, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The patent applies partial action by performing throughput measurements at selected output levels rather than at every possible level. The system strategically chooses which output levels to measure based on throughput feedback, performing measurements only where necessary to determine the appropriate next step, thereby reducing the total number of transmissions and receptions while maintaining measurement accuracy.
Data Source
AI summary
In a measurement device, a reception sensitivity test control unit includes drop determination means for determining whether or not a measured throughput is in a dropped state to a preset proportion in a steep drop region in which the throughput drops steeply, and output level setting means 18e for performing a setting process of setting an output level of the test signal to be different from a previous output level according to a comparison result indicating whether a throughput measurement result exceeds a predetermined threshold value and a determination result indicating whether the measured throughput is in the dropped state by the drop determination means, the setting process including a process of performing level down or level up on the output level of the test signal with respect to the previous output level in units of an error tolerance level EL when it is determined to be the dropped state.