V2X UE Synchronization Switching for Stable Sidelink Broadcasts

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Solution Overview

Problem

Communication disconnection occurs in V2X systems when the reference synchronization source changes during sidelink communication, affecting all UEs participating in the service unless they are synchronized.

Innovation Solution

A method for UEs to synchronize with a new reference synchronization source by transmitting information about the change and waiting for a period of time before switching, ensuring seamless transition.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the reference synchronization source is changed during sidelink communication, then the system can adapt to better synchronization sources, but communication disconnection occurs unless all UEs are synchronized

Engineering Contradiction:

Improveability to change reference synchronization sourceVSAvoidcommunication connection stability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The transmitting UE performs preliminary actions by notifying receiving UEs of the synchronization source change before actually switching. This advance notification allows receiving UEs to prepare for the change, ensuring they all transition to the new synchronization source simultaneously, thereby preventing communication disconnection while enabling system adaptability

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system implements feedback mechanisms where the transmitting UE monitors synchronization status and initiates changes only when appropriate. The notification process provides feedback to receiving UEs about upcoming changes, enabling coordinated adaptation across all UEs while maintaining communication reliability during the transition

Inventive Principle:

Principle #23Feedback

2Speed

If the reference synchronization source changes immediately, then the system responds quickly to synchronization needs, but broadcast services may be interrupted

Engineering Contradiction:

Improvespeed of synchronization source changeVSAvoidcontinuous service duration

Core Design Contradiction:

SpeedVSDuration of action of stationary object

Solution Approach 1:

The transmitting UE sends a notification message to receiving UEs before changing the synchronization source. This preliminary notification allows receiving UEs to prepare for the change and switch at the same time, enabling quick synchronization source changes without interrupting broadcast services

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The notification mechanism ensures that the useful action of broadcast communication continues uninterrupted during the synchronization source change. By coordinating the switch across all UEs simultaneously, the system maintains continuous service while achieving quick adaptation to new synchronization sources

Inventive Principle:

Principle #20Continuity of useful action

Data Source

PatentUS12538246B2Method for synchronization between UEs according to change in reference synchronization source in V2X communication system, and device therefor

Publication Date: 2026.01.27 LG ELECTRONICS INC

AI summary

Provided are a method for synchronization between user equipments (UEs) according to a change in a reference synchronization source in a vehicle-to-everything (V2X) communication system, and a device therefor. A first transmission UE transmits information on a change in a reference synchronization source to at least one reception UE, and after a predetermined time, changes the reference synchronization source from the first transmission UE to a second transmission UE.