GNSS Outage Position Uncertainty Control Using Relative Velocity Profiles
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Solution Overview
Problem
User equipment (UE) experiences increased position uncertainty (PUNC) when it cannot receive beacon signals from long-range (LR) beacon devices like GNSS, leading to inefficient and resource-intensive positioning processes.
Innovation Solution
The UE restricts the growth of PUNC by considering maximum vehicle speed and using short-range (SR) beacon devices such as RSUs or other UEs to calculate a relative velocity profile, thereby optimizing positioning accuracy and resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE continues positioning processes without receiving beacon signals, then positioning availability is maintained, but position uncertainty (PUNC) increases leading to inefficient and resource-intensive operations
Solution Approach 1:
The system performs preliminary actions by calculating relative velocity profiles using SR beacon devices (RSUs) before GNSS signal loss occurs, and maintains these velocity estimates during the outage period. This preliminary velocity information is ready when GNSS signals return, enabling faster convergence without allowing PUNC to grow excessively.
Solution Approach 2:
SR beacon devices (RSUs) act as intermediary elements that provide positioning assistance when LR beacon devices (GNSS) are unavailable. The UE uses SR beacons to obtain velocity profile information that serves as a bridge during signal outages, preventing complete loss of positioning state and reducing the time to recover when GNSS signals return.
2Measurement precision
If the UE uses SR beacon devices to calculate relative velocity profile, then positioning accuracy is improved, but device complexity and processing requirements increase
Solution Approach 1:
The positioning function is segmented into two parts: LR beacon devices (GNSS) provide primary positioning when available, while SR beacon devices (RSUs) provide auxiliary velocity profile information. This segmentation allows the system to use the simpler SR beacon processing only when needed (during GNSS outages), rather than continuously, thus managing device complexity while maintaining accuracy.
Solution Approach 2:
The SR beacon device infrastructure serves multiple functions: it provides velocity profile information for PUNC restriction, acts as a backup positioning source during GNSS outages, and can provide timing synchronization. This multi-functionality justifies the additional processing complexity by delivering multiple benefits from a single infrastructure.
3Productivity
If the UE restricts PUNC growth using maximum vehicle speed, then positioning efficiency is improved, but reliability may be compromised if speed estimates are inaccurate
Solution Approach 1:
The system uses feedback from SR beacon devices to continuously update and refine the velocity profile estimates. This feedback mechanism allows the UE to adjust its PUNC restriction calculations based on actual observed motion from SR beacon measurements, rather than relying solely on maximum vehicle speed assumptions, thereby maintaining both efficiency and reliability.
Data Source
AI summary
A first user equipment (UE) may receive a first set of beacon signals from a set of global navigation satellite system (GNSS) devices. The first UE may restrict growth of a position uncertainty (PUNC) value associated with the first UE based on a maximum vehicle speed and based on a lack of a reception of a beacon signal from the set of GNSS devices within a threshold period of time. The first UE may restrict growth of the PUNC value further based on a relative velocity profile associated with the first UE. The first UE may receive a message including a second relative velocity profile from a second UE. The first UE may calculate the relative velocity profile based on the second relative velocity profile.