DL PRS Aggregation Across Frequency Layers for NR Positioning
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Solution Overview
Problem
The current NR system is limited by the bandwidth of positioning reference signals (PRS) in each frequency layer, preventing the aggregation of PRS across multiple frequency layers to enhance positioning accuracy.
Innovation Solution
A method for aggregating downlink positioning reference signal (DL PRS) resources from multiple transmission points to improve positioning measurement accuracy, involving configuration and aggregation of DL PRS resources by user equipment (UE) and base station communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If PRS is transmitted in multiple frequency layers individually, then the system can support positioning measurement in each layer, but the bandwidth of PRS in one frequency layer is limited to 100 MHz which restricts positioning performance
Solution Approach 1:
The patent combines PRS resources from multiple frequency layers into a unified positioning measurement process. The UE aggregates DL PRS resources across different frequency layers (e.g., F1 and F2) to perform joint positioning measurements, effectively merging the bandwidth capacity of multiple layers to achieve positioning accuracy that exceeds the limitation of individual 100 MHz layers.
2Measurement precision
If the NR system aggregates PRS in multiple frequency layers, then the equivalent bandwidth of PRS increases which can boost positioning accuracy, but the current system is unable to perform this aggregation
Solution Approach 1:
The base station performs preliminary configuration by providing the UE with aggregation configuration information before positioning measurements are performed. This pre-configuration includes parameters needed for aggregating PRS resources across multiple frequency layers, such as resource identifiers, frequency layer information, and measurement settings, thereby simplifying the overall process.
Solution Approach 2:
The patent extends the positioning measurement from a single frequency layer dimension to multiple frequency layer dimensions. By introducing the frequency layer dimension as an additional aggregation axis, the system effectively increases the total PRS bandwidth available for positioning without requiring changes to the fundamental 100 MHz per-layer limitation.
3Ease of manufacture
If positioning measurement is performed based on PRS in each frequency layer individually, then the system implementation is straightforward, but the positioning performance is limited by the bandwidth of PRS in one frequency layer
Solution Approach 1:
The patent creates a universal positioning measurement framework that can handle both single-frequency-layer and multi-frequency-layer scenarios. The aggregation mechanism is designed to be flexible, allowing the UE to aggregate PRS resources from one or multiple frequency layers based on configuration, thereby maintaining implementation simplicity while enabling enhanced positioning accuracy when needed.
Data Source
AI summary
A wireless communication method of positioning measurement, by a user equipment (UE) includes receiving a configuration information of a plurality of downlink positioning reference signal (DL PRS) resources of a plurality of transmission points (TPs) from a base station, aggregating a first DL PRS resource and a second DL PRS resource of the DL PRS resources based on the configuration information to obtain at least one positioning measurement result, and reporting the at least one positioning measurement result to the base station.