Digital Twin RF Maps for Scalable NLoS UE Localization
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Solution Overview
Problem
Existing localization methods in wireless networks face scalability issues due to high communication overhead and require specialized hardware, making them unsuitable for massive multi-user tracking, especially in non-line-of-sight (NLoS) conditions and sub-6 GHz deployments with scarce bandwidth.
Innovation Solution
The use of digital twin RF maps created through ray tracing simulations in a digital replica of the environment to populate fingerprinting databases, allowing for precise localization of user equipment (UE) without the need for line-of-sight (LoS), multiple base stations, dedicated hardware, or channel estimation, leveraging received signal strength (RSS) measurements across multiple beams and subbands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If triangulation or trilateration methods are used for localization, then positioning can be achieved in line-of-sight conditions, but the system requires specialized hardware and high communication overhead making it unscalable for massive multi-user tracking
Solution Approach 1:
The patent creates a digital twin (virtual copy) of the physical environment including 3D maps, building structures, and propagation characteristics. This digital replica is used to generate synthetic fingerprinting data through ray tracing simulations, eliminating the need for specialized hardware and reducing communication overhead while maintaining positioning accuracy
Solution Approach 2:
The system performs preliminary ray tracing simulations to pre-compute propagation paths and generate fingerprinting databases before actual localization operations. This pre-computation creates a lookup table of expected signal characteristics at various locations, enabling fast and accurate positioning without real-time complex calculations or specialized hardware
2Measurement precision
If fingerprinting localization with large databases is used, then positioning accuracy improves, but building the database requires significant human effort and crowd-sourcing
Solution Approach 1:
The patent uses the digital twin environment to copy real-world propagation characteristics into a virtual space. Ray tracing simulations in this digital replica automatically generate comprehensive fingerprinting databases with synthetic measurements, eliminating the need for time-consuming crowd-sourcing and manual data collection while achieving large database sizes necessary for high accuracy
Solution Approach 2:
The system performs self-service by automatically generating its own fingerprinting database through computational ray tracing simulations in the digital twin environment. No external crowd-sourcing or manual measurement collection is required - the digital replica itself produces the training data needed for accurate localization
3Adaptability or versatility
If digital twin RF maps with ray tracing are used to populate fingerprinting databases, then scalability and positioning accuracy in NLoS scenarios improve, but computational complexity increases
Solution Approach 1:
The computationally intensive ray tracing simulations are performed in advance during the database construction phase, not during real-time localization. The digital twin environment stores pre-computed propagation paths and signal characteristics, allowing fast lookup and comparison during actual positioning operations without requiring complex real-time calculations
Solution Approach 2:
The digital twin creates a virtual copy of the physical environment where complex electromagnetic propagation can be simulated without affecting real-world systems. Once the digital replica is established, it can be reused multiple times to generate fingerprints for different scenarios and conditions without repeating the full ray tracing computation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces human effort and enables scalable, accurate UE localization in NLoS scenarios, improving positioning accuracy and reducing the need for specialized hardware, while being applicable to sub-6 GHz deployments with limited bandwidth.
Implementation Method 1
ray tracing simulations compute propagation paths
Data Source
AI summary
A system and method using a digital replica to populate large fingerprinting databases. A digital twin map is created ray-tracing simulations on a digital replica of the environment across several frequency bands and beamforming configurations. Online user equipment fingerprints are matched against this spatial database. A user equipment position measured in real-time and the digital twin map are used to compute the most probable location of the user equipment.