SoftV2X UWB Positioning Using Peer Anchors and GNSS Fusion
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Solution Overview
Problem
Existing wireless communication systems face challenges in achieving accurate position measurement for user equipment (UE) in vehicle-to-everything (V2X) scenarios, particularly due to limitations in Ultra-WideBand (UWB) technology, which struggles with high power consumption and positioning accuracy, especially in outdoor environments with limited anchor infrastructure.
Innovation Solution
The proposed solution involves a UE operating in a tag mode to transmit and receive Personal Safety Messages (PSM) or Basic Safety Messages (BSM) with a UWB Token ID, initiating an Ultra-WideBand (UWB) session for Time of Flight (ToF) or angle of arrival (AoA)-based measurements, integrating UWB and GNSS-based measurements using a Kalman filter for improved positioning, and utilizing an SSR delegator to manage SSR correction information efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If UWB-based positioning is used in V2X scenarios, then positioning accuracy is improved, but the complexity of anchor infrastructure installation increases
Solution Approach 1:
The patent enables UEs to autonomously perform positioning measurements using peer-to-peer UWB communication without requiring external anchor infrastructure. Each UE acts as both transmitter and receiver, performing ToF and AoA measurements mutually with other UEs in the network, thereby eliminating the need for pre-installed anchor nodes while maintaining positioning accuracy.
Solution Approach 2:
The patent introduces a gNB (base station) as an intermediary that facilitates UWB session management and coordination between UEs. The gNB receives measurement results from UEs and provides positioning information, acting as a centralized coordinator that simplifies the distributed measurement process without requiring physical anchor infrastructure at UE locations.
2Measurement precision
If continuous UWB sessions are maintained for positioning, then positioning accuracy is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic UWB session establishment and teardown based on positioning requirements. UEs establish UWB sessions only when positioning is needed (e.g., during V2X communication events requiring location information) and terminate sessions when not needed, rather than maintaining continuous sessions. This periodic operation significantly reduces power consumption while ensuring positioning accuracy is available when required.
Solution Approach 2:
The patent dynamically adjusts UWB session management based on real-time positioning accuracy requirements and V2X communication needs. The system activates UWB positioning functionality only when positioning accuracy thresholds are not met or when V2X services require updated location information, and deactivates it when requirements are satisfied, creating a dynamic power-saving mechanism.
3Reliability
If multiple UWB anchors are deployed outdoors, then positioning reliability is improved, but the difficulty of installation increases
Solution Approach 1:
The patent transforms the positioning system into a self-configuring network where UEs automatically discover and establish UWB sessions with each other without requiring manual anchor deployment. Each UE autonomously performs peer discovery, session establishment, and measurement coordination with neighboring UEs, creating a self-organizing positioning network that eliminates complex outdoor anchor installation while maintaining reliability through multiple peer-to-peer measurement paths.
4Measurement precision
If UWB Token ID is included in safety messages, then UE identification accuracy is improved, but data transmission volume increases
Solution Approach 1:
The patent reuses existing V2X safety message structures (BSM/PSM) that are already transmitted periodically for vehicle safety communication, embedding UWB Token IDs within these universal messages. This allows the same message infrastructure to serve both safety communication and positioning identification functions simultaneously, avoiding additional dedicated signaling overhead while maintaining accurate UE identification.
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 enhances positioning accuracy for UEs by reducing power consumption and data usage, allowing precise location determination even with limited anchor infrastructure, and improves overall positioning accuracy through UWB and GNSS fusion.
Implementation Method 1
perform Time of Flight (ToF) or angle of arrival (AoA)-based measurement
Implementation Method 2
perform Time of Flight (ToF) or angle of arrival (AoA)-based measurement
Data Source
AI summary
A first user equipment (UE) including a transmitter configured to transmit a first safety message including a first Ultra-WideBand (UWB) token ID of the first UE for connecting to an UWB session; a receiver configured to receive a second safety message transmitted by a second UE in an anchor mode, the second safety message including a second UWB token ID of the second UE for connecting to the UWB session; and a controller configured to set the first UE into a tag mode, initiate the Ultra-WideBand (UWB) session with the second UE having the second UWB token ID, perform Time of Flight (ToF) or angle of arrival (AoA)-based measurement based on the second UE in the anchor mode, and update a location of the first UE based on the ToF or AoA-based measurement.