Sidelink PRS Slot Alignment for Accurate V2X Positioning

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Solution Overview

Problem

Existing wireless communication systems face challenges in efficiently managing increasing data traffic and latency requirements, particularly in sidelink communication for vehicle-to-everything (V2X) applications, necessitating enhanced mobile broadband and ultra-reliable low latency communication.

Innovation Solution

The implementation of sidelink positioning reference signals (SL PRS) within a slot, where the first and second SL PRS are aligned in symbols, enabling efficient positioning and communication.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If multiple SL PRS are multiplexed within one slot for positioning, then positioning accuracy is improved, but symbol timing alignment becomes difficult and interference may occur

Engineering Contradiction:

Improvepositioning accuracyVSAvoidsymbol timing alignment

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent applies parameter changes by configuring specific timing relationships between SL PRS symbols and other sidelink symbols. It defines that SL PRS symbols should be aligned with corresponding symbols in other slots and establishes specific slot offsets (e.g., slotOffset parameter) to ensure proper timing alignment. This resolves the timing alignment difficulty while enabling multiple SL PRS multiplexing for improved positioning accuracy.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If SL PRS transmission is enhanced for reliability, then positioning reliability is improved, but latency may increase

Engineering Contradiction:

Improvepositioning reliabilityVSAvoidlatency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent implements periodic action by configuring SL PRS transmission with specific periodicity parameters. It defines that SL PRS should be transmitted periodically with configurable intervals, allowing the system to balance between transmission frequency (reliability) and time between transmissions (latency). This enables optimized positioning reliability without excessive latency penalty.

Inventive Principle:

Principle #19Periodic action

3Productivity

If SL PRS resource allocation is optimized for data traffic, then productivity is improved, but positioning precision may deteriorate

Engineering Contradiction:

Improvedata traffic efficiencyVSAvoidpositioning precision

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The patent applies segmentation by dividing the time-frequency resources into dedicated SL PRS resources and general data traffic resources. It defines specific resource element patterns and resource block allocations for SL PRS that are separate from data channels, ensuring that positioning resources are not consumed by data traffic while maintaining overall system productivity.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentEP4598231A1Method and apparatus for configuring SL PRS slot structure for SL positioning

Publication Date: 2025.08.06 LG ELECTRONICS INC

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AI summary

Provided are a method by which a first device carries out wireless communication, and an apparatus supporting same. The method may comprise the steps of: acquiring configuration information related to a sidelink (SL) positioning reference signal (PRS); transmitting a first SL PRS on the basis of the configuration information related to the SL PRS; and performing positioning on the basis of the first SL PRS. For example, the first SL PRS and a second SL PRS are mapped within one slot, a first symbol of the first SL PRS and a first symbol of the second SL PRS are aligned, and a last symbol of the first SL PRS and a last symbol of the second SL PRS may be aligned.