V2X Terminal Synchronization Signal Selection

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Solution Overview

Problem

Vehicle-to-everything (V2X) terminals face synchronization errors due to cumulative errors in SideLink synchronization chains, which reduce synchronization accuracy in V2X communication systems.

Innovation Solution

A method that detects synchronization signals, selects and compares SLSS and GNSS synchronization signals for optimal synchronization, and synchronizes using the optimal signal to minimize errors, including calibrating the crystal oscillator based on the optimal synchronization signal.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If SideLink synchronization chain is used for V2X communication, then direct communication between vehicle terminals is enabled, but cumulative synchronization errors increase

Engineering Contradiction:

Improvedirect communication capabilityVSAvoidsynchronization accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent introduces a base station as an intermediary synchronization source. Vehicle terminals that are not directly connected to the base station can still obtain synchronization information through the base station, breaking the cumulative error chain in SideLink synchronization while maintaining direct communication capability.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent implements feedback mechanisms where the base station provides synchronization signals that vehicle terminals use to correct their local synchronization clocks. This feedback loop continuously compensates for accumulation errors in the SideLink synchronization chain.

Inventive Principle:

Principle #23Feedback

2Measurement precision

If multiple synchronization signals (SLSS and GNSS) are detected and compared, then synchronization accuracy is improved, but device complexity increases

Engineering Contradiction:

Improvesynchronization accuracyVSAvoidsignal processing complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent changes the parameter of synchronization signal selection by comparing multiple signals (SLSS and GNSS) and selecting the optimal one based on synchronization error metrics. This parameter optimization improves accuracy without requiring complex processing of all signals simultaneously.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent segments the synchronization signal processing into distinct steps: detecting SLSS signals, detecting GNSS signals, calculating synchronization errors for each, and selecting the optimal signal. This segmentation reduces processing complexity by handling signals in manageable stages rather than processing all signals simultaneously.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS20240121735A1Synchronization method, vehicle-to-everything terminal, and storage medium

Publication Date: 2024.04.11 TCL COMM (NINGBO) CO LTD

AI summary

The present application discloses a synchronization method, a vehicle-to-everything terminal, and a storage medium. The method is applied to the vehicle-to-everything terminal and comprises: detecting a synchronization signal; when at least one SLSS synchronization signal is detected, obtaining a GNSS synchronization signal; respectively performing synchronization error detection on the at least one SLSS synchronization signal and the GNSS synchronization signal to determine an optimal synchronization signal; and performing synchronization according to the optimal synchronization signal.