Sensor Sharing with Relative Coordinates for Accurate Object Positioning
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Solution Overview
Problem
Existing wireless communication systems face significant position errors in determining the absolute positions of objects using GPS or GNSS, which can negatively impact safety and driving decisions in vehicle-to-everything (V2X) systems.
Innovation Solution
A method and apparatus for sharing sensor information using an alternative coordinate system where UEs determine the position of an object relative to a common reference entity, transmitting this information to other UEs, allowing them to calculate the object's position based on sensor measurements rather than absolute positioning systems, thereby reducing errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If absolute position determination using GPS or GNSS is used, then positioning information can be obtained, but the position error is relatively large (on the scale of one or more meters)
Solution Approach 1:
The patent introduces a reference entity (such as a roadside unit or fixed infrastructure element) as an intermediary between the UEs. Instead of directly relying on GPS/GNSS absolute positions, the system uses the reference entity's known position as a mediator to establish a local coordinate system. This intermediary enables relative position measurements that are more accurate than absolute GPS positioning, thereby resolving the contradiction between obtaining positioning information and maintaining accuracy for safety-critical decisions.
Solution Approach 2:
The patent changes the reference frame parameter from absolute GPS coordinates to relative coordinates based on a local reference entity. By transforming the coordinate system from global (GPS) to local (reference-entity-based), the system achieves higher measurement precision for relative positions while maintaining the ability to make safety and driving decisions. This parameter change allows the system to operate in a coordinate system where errors are minimized.
2Loss of information
If sensor sharing information is transmitted to determine object position, then positioning information can be obtained, but the error associated with absolute position determination negatively impacts decision-making
Solution Approach 1:
The patent applies local quality by establishing a local coordinate system centered on a reference entity that is specific to the local environment rather than using a global coordinate system. Each UE determines positions relative to this local reference, creating a localized measurement framework that minimizes errors for that specific area. This local approach ensures that position information accuracy is optimized for the immediate vicinity, reducing the harmful effects of position errors on safety decisions.
3Measurement precision
If a common reference entity is used for alternative coordinate system, then measurement precision is improved, but the system complexity increases due to reference entity selection and coordination
Solution Approach 1:
The patent implements self-service by enabling each UE to independently determine its position relative to the reference entity using sensor measurements. Rather than requiring complex centralized coordination or inter-UE communication to establish the coordinate system, each UE autonomously performs the necessary calculations using the reference entity's known position and its own sensor data. This self-service approach improves measurement precision while minimizing system complexity.
Data Source
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AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may detect an object and determine to share position information associated with the object with one or more UEs. The UE may select a reference entity detectable by one or more other UEs and determine the position of the detected object relative to the position of the selected reference entity. The UE may transmit, to one or more second UEs, a sensor sharing message that includes the position information of the object relative to the selected reference entity and an indication of the selected reference entity. The one or more second UEs may detect the position of the reference entity and determine the location of the detected object based on the position of the reference entity and the position of the detected object relative to the position of the reference entity.