PRS Power Mapping for High-Accuracy Terminal Positioning
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Solution Overview
Problem
Existing positioning methods, particularly for downlink-angle of departure (DL-AoD), are limited by assistance data that allows only rough angle estimation, preventing high-accuracy positioning.
Innovation Solution
A positioning method that includes assistance data with mapping relationships between PRS resource identifiers and power information at preset angles, enabling accurate angle estimation and high-accuracy positioning by a location management device or access network device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing assistance data with spatial direction information (azimuth, elevation, beam width) is used, then the positioning system can operate with simple assistance data structure, but only rough angle range estimation is achieved and high-accuracy positioning cannot be implemented
Solution Approach 1:
The patent transforms the assistance data from simple spatial direction parameters (azimuth, elevation, beam width) to a mapping relationship structure that associates PRS resource identifiers with power information at multiple preset angles. This parameter transformation enables precise angle estimation by comparing measured power values against the mapping relationships, resolving the contradiction between measurement precision and data structure complexity.
Solution Approach 2:
The access network device pre-calculates and stores power information for multiple PRS resources at multiple preset angles before positioning occurs. This preliminary action creates a ready-to-use mapping relationship that eliminates the need for complex real-time calculations, enabling high-accuracy angle estimation while maintaining operational simplicity.
2Measurement precision
If new assistance data with mapping relationships between PRS resource identifiers and power information at preset angles is designed, then high-accuracy positioning can be achieved, but the assistance data structure becomes more complex
Solution Approach 1:
The patent segments the positioning information into discrete mapping relationships between PRS resource identifiers and power information at specific preset angles. Each mapping relationship is an independent data element that can be individually managed and processed, making the complex information structure more manageable while enabling precise angle determination through systematic comparison.
3Measurement precision
If multiple PRS resources with mapping relationships at multiple preset angles are used for accurate angle estimation, then positioning accuracy improves, but signaling overhead and latency increase
Solution Approach 1:
The access network device performs the computationally intensive task of calculating power information for multiple PRS resources at multiple preset angles in advance, before the actual positioning measurement occurs. This preliminary calculation eliminates the need for time-consuming real-time computations, thereby reducing signaling latency while maintaining high angle estimation accuracy.
Solution Approach 2:
The patent creates a pre-computed copy of the power information mapping relationships that can be quickly referenced during positioning measurements. Instead of performing complex calculations during the positioning event, the system uses the pre-prepared mapping data copy, significantly reducing processing time and signaling overhead while preserving measurement accuracy.
Data Source
AI summary
A positioning method includes: a location management device obtains a plurality of assistance data from one or more access network devices, where each assistance data includes one or more groups of mapping relationships corresponding to one or more preset angles, and each group of mapping relationships includes a mapping relationship between each of one or more PRS resource identifiers and power information corresponding to each PRS resource identifier at a corresponding preset angle; the location management device obtains, from a terminal device, power information corresponding to one or more PRS resource identifiers at each of a plurality of to-be-measured angles; and the location management device positions the terminal device based on the plurality of assistance data and the power information.