CA Positioning PRS Measurement Priority to Reduce TRP Switching
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Solution Overview
Problem
The challenge in carrier aggregation (CA) positioning scenarios is the high processing complexity for measuring positioning reference signals (PRS) by terminal devices, which hinders efficient bandwidth utilization and accuracy improvement.
Innovation Solution
A method is introduced to determine priorities among transmission and reception points (TRPs) based on predefined or preconfigured rules, reducing frequency band and FFT switching, and optimizing baseband and radio frequency implementations by assigning higher priorities to specific frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the terminal device measures reference signals from multiple TRPs with different frequency band groups in CA positioning, then positioning accuracy is improved, but processing complexity and frequency band switching overhead increase
Solution Approach 1:
The network side performs preliminary action by pre-configuring priority information for multiple TRPs before the terminal device needs to measure reference signals. The terminal device stores this priority information and uses it to determine the measurement sequence, eliminating the need for real-time complex decisions and reducing processing overhead during actual positioning measurement.
Solution Approach 2:
The patent introduces dynamic priority adjustment where the terminal device can adjust the measurement sequence based on stored priority information. This dynamic approach allows the terminal to adaptively select which TRP to measure first, optimizing the balance between positioning accuracy and processing complexity by leveraging pre-established priority rules rather than attempting to evaluate all possibilities simultaneously.
2Adaptability or versatility
If the terminal device performs frequent frequency band switching to measure PRS from different TRPs, then measurement coverage is improved, but baseband implementation complexity increases
Solution Approach 1:
The network side performs preliminary action by pre-configuring priority information for multiple TRPs before the terminal device needs to measure reference signals. The terminal device stores this priority information and uses it to determine the measurement sequence, eliminating the need for real-time complex decisions and reducing processing overhead during actual positioning measurement.
Solution Approach 2:
By using pre-configured priority information, the terminal device can skip unnecessary frequency band switching operations. Instead of exhaustively trying all frequency combinations, the terminal follows a predetermined sequence that prioritizes certain TRPs, effectively skipping through less optimal measurement combinations to achieve sufficient positioning accuracy with reduced switching overhead.
3Adaptability or versatility
If the terminal device performs FFT switching to accommodate different bandwidth configurations, then measurement flexibility is improved, but radio frequency implementation complexity increases
Solution Approach 1:
The network side performs preliminary action by pre-configuring priority information for multiple TRPs before the terminal device needs to measure reference signals. The terminal device stores this priority information and uses it to determine the measurement sequence, eliminating the need for real-time complex decisions and reducing processing overhead during actual positioning measurement.
Solution Approach 2:
The patent applies parameter changes by using pre-configured priority information to determine the measurement sequence. Instead of dynamically adjusting FFT size and other parameters for each TRP measurement, the terminal follows a predetermined sequence based on stored priority rules, reducing the complexity of radio frequency implementation while maintaining measurement flexibility across different TRPs with varying bandwidth configurations.
Data Source
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Figure 3A~3B
AI summary
This application relates to the field of communication technologies, and discloses a communication method and apparatus. The method includes: A terminal device determines priorities of a plurality of TRPs, and measures reference signals from the plurality of TRPs based on the priorities of the plurality of TRPs. The priorities of the plurality of TRPs are: A priority of a first TRP is higher than a priority of a second TRP; and/or the priority of the second TRP is higher than a priority of a third TRP. Reference signals from the first TRP are on a first frequency band group; reference signals from the second TRP are on a second frequency band group, and a total bandwidth of the first frequency band group is the same as a total bandwidth of the second frequency band group. Reference signals from the third TRP are on a third frequency band group, and the total bandwidth of the first frequency band group is different from a total bandwidth of the third frequency band group. This helps reduce a quantity of times of frequency band switching and/or FFT switching in a measurement process, and lower complexity of baseband implementation and radio frequency implementation when the terminal device performs CA positioning measurement.