NR PRS-LTE CRS Association for Dynamic Spectrum Positioning
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Solution Overview
Problem
Existing UE positioning methods, such as GNSS, are limited to outdoor areas with satellite visibility, and there is a need for accurate positioning solutions in both outdoor and indoor environments.
Innovation Solution
The method involves receiving and processing LTE CRS and 5G NR PRS signals in the same frequency band using dynamic spectrum sharing techniques, allowing the UE to determine an association between these signals based on configuration data to enhance positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GNSS is used for UE positioning, then positioning accuracy is improved in outdoor areas, but coverage is limited to areas with satellite visibility
Solution Approach 1:
The patent combines GNSS positioning with network-based positioning methods (LTE CRS and 5G NR PRS) to create a hybrid positioning system. This merging allows the system to leverage satellite visibility for outdoor accuracy while using cellular network reference signals for indoor and obstructed area coverage, thus resolving the contradiction between positioning accuracy and coverage area.
Solution Approach 2:
The patent enables the positioning system to perform multiple functions by supporting both GNSS-based positioning for outdoor areas and network-based positioning for indoor areas. The system can adaptively switch between or combine these methods, making the positioning infrastructure universal across different environments and eliminating the coverage limitation of pure GNSS approaches.
2Adaptability or versatility
If network-based positioning methods are used in LTE and 5G NR networks, then coverage is extended to indoor areas, but positioning accuracy deteriorates compared to GNSS
Solution Approach 1:
The patent merges network-based positioning methods (which provide indoor coverage) with GNSS positioning (which provides high accuracy outdoors). By combining measurements from both LTE CRS and 5G NR PRS with GNSS data, the system achieves acceptable positioning accuracy indoors while maintaining high accuracy outdoors, thus resolving the accuracy deterioration issue.
Solution Approach 2:
The patent creates a composite positioning solution that integrates multiple positioning technologies (GNSS, LTE CRS, 5G NR PRS) into a unified system. This composite approach allows the system to leverage the strengths of each individual method while compensating for their weaknesses, achieving both extended coverage and maintained accuracy across diverse environments.
3Productivity
If dynamic spectrum sharing is implemented between LTE and 5G NR, then spectrum resource efficiency is improved, but signal interference increases
Solution Approach 1:
The patent segments the shared spectrum resources by assigning specific reference signal resources to LTE CRS and 5G NR PRS in a structured manner. Through rate matching and resource element allocation, the system divides the available spectrum in a way that allows both technologies to operate simultaneously while minimizing mutual interference, thus maintaining spectrum efficiency.
Solution Approach 2:
The patent introduces configuration data as an intermediary mechanism that coordinates the transmission of LTE CRS and 5G NR PRS in shared spectrum. This configuration data provides advance information to UEs about the presence and characteristics of reference signals from both systems, enabling proper signal separation and measurement, thereby reducing the harmful effects of interference while maintaining spectrum sharing benefits.
Data Source
AI summary
A method of using reference signals from different radio access technologies (RATs) for user equipment (UE) positioning includes, by the UE, receiving assistance data indicating an association between first reference signals of a first RAT and second reference signals of a second RAT in a frequency band, determining that the first reference signals and the second reference signals are deployed in the frequency band based on the assistance data, receiving the first reference signals and the second reference signals in the frequency band from one or more network nodes, determining the association between the first reference signals and the second reference signals based on configuration data, and determining positioning data associated with the location of the UE based on the determined association and both the received first reference signals and the received second reference signals.