TRP Estimation for 5G Base Stations Using Radiation Pattern Correlation
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Solution Overview
Problem
Current methods for measuring Total Radiated Power (TRP) in cellular base stations, particularly for in-band unwanted emissions, are inadequate due to assumptions of correlated radiation patterns between operating and neighboring frequencies, which may not hold for active-antenna systems like 5G millimeter-wave base stations, leading to incorrect TRP estimations.
Innovation Solution
A method to determine the correlation between radiation patterns of operating and in-band neighboring frequencies using three correlation test criteria, allowing for the application of the beam-based directions procedure to compute accurate TRP estimates, thereby addressing the applicability issue in active-antenna systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the beam-based directions procedure is applied to compute TRP estimates for in-band neighboring frequencies, then measurement time and complexity are reduced, but measurement accuracy deteriorates when radiation patterns are not correlated
Solution Approach 1:
The patent introduces a dynamic approach by implementing three correlation test criteria that adaptively determine whether the beam-based directions procedure is applicable. The system dynamically assesses the correlation between radiation patterns at operating and neighboring frequencies, and only applies the simplified beam-based method when correlation is confirmed, otherwise falling back to more accurate but complex measurement procedures.
Solution Approach 2:
The patent performs preliminary correlation testing before committing to a measurement approach. By evaluating the three correlation test criteria (comparing main lobe directions, beamwidths, and side lobe structures) in advance, the system determines the appropriate measurement strategy, preventing inaccurate TRP estimates while maintaining efficiency when conditions permit.
2Measurement precision
If traditional TRP measurement methods are used for in-band neighboring frequencies, then measurement accuracy is maintained, but measurement time and complexity increase
Solution Approach 1:
The patent creates a dynamic measurement system that adapts its complexity based on radiation pattern correlation. When the three correlation test criteria are satisfied, the system dynamically switches to the efficient beam-based directions procedure, automatically reducing measurement time and complexity while maintaining accuracy through the correlation validation.
Solution Approach 2:
The patent changes the measurement approach parameters based on the correlation assessment. By evaluating radiation pattern characteristics (main lobe direction, beamwidth, side lobe structure) as parameters, the system selects between different measurement methodologies, optimizing the balance between accuracy and efficiency for each specific frequency scenario.
3Ease of operation
If the beam-based directions procedure is applied without correlation verification, then measurement simplicity is maintained, but harmful interference from incorrect TRP estimates increases
Solution Approach 1:
The patent applies preliminary anti-action by implementing correlation verification tests before applying the beam-based directions procedure. The three correlation test criteria serve as preventive measures that identify conditions under which the simplified method would produce harmful incorrect estimates, blocking its application when correlation is insufficient and thus preventing the generation of harmful measurement errors.
Solution Approach 2:
The patent introduces feedback through the correlation test criteria that evaluate radiation pattern characteristics and provide information about the suitability of the beam-based method. This feedback mechanism ensures that the simplified procedure is only applied when the radiation patterns are sufficiently correlated, preventing harmful incorrect TRP estimates while maintaining operational simplicity when conditions permit.
Data Source
AI summary
A determination is made, for a base station that transmits on an operating frequency, whether a radiation pattern of each of one or more neighboring frequencies is correlated with a radiation pattern of the operating frequency. In response to a determination that the radiation pattern of each of the one or more neighboring frequencies is correlated with that of the operating frequency, a computation is made of a total radiated power estimate of each of the one or more neighboring frequencies by performing a beam-based directions procedure for the base station. The total radiated power estimates of each of the one or more neighboring frequencies are output.