V2X Synchronization Signal Priority Selection Mechanism
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Solution Overview
Problem
In Vehicle-to-X (V2X) communication, existing methods lack an effective mechanism for prioritizing and selecting synchronization signals from multiple sources, such as eNB, GNSS, and other UEs, which is crucial for maintaining accurate timing and synchronization in wireless communication systems.
Innovation Solution
A method and apparatus for V2X User Equipment (UE) to select and transmit synchronization signals by determining the priority of received signals based on their sources, using primary and secondary sidelink synchronization signals (PSSS and SSSS) mapped to specific SC-FDMA symbols, and considering the timing association with GNSS, eNB, and UE sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If V2X UE receives synchronization signals from multiple sources (eNB, GNSS, other UEs), then synchronization signal availability increases, but signal priority determination complexity increases
Solution Approach 1:
The patent segments the synchronization signal selection process into distinct priority levels: GNSS-based synchronization has highest priority, followed by eNB-based synchronization, and finally UE-based synchronization. This segmentation allows the UE to systematically evaluate and select from multiple sources without complex decision-making, resolving the contradiction between signal availability and determination complexity.
Solution Approach 2:
The patent changes the parameter of signal priority assignment based on the synchronization source type. By assigning different priority levels to different sources (GNSS > eNB > UE), the system simplifies the selection process while maintaining the benefit of receiving signals from multiple sources. This parameter change resolves the technical contradiction by making the complexity manageable through standardized priority rules.
2Area of stationary object
If V2X UE transmits synchronization signals to other UEs, then synchronization coverage increases, but transmission reliability decreases due to lack of priority mechanism
Solution Approach 1:
The patent implements a feedback mechanism where receiving UEs report their synchronization status and signal quality information back to transmitting UEs. This feedback allows transmitting UEs to adjust their transmission parameters and priority levels, ensuring reliable synchronization transmission while maintaining broad coverage. The feedback loop resolves the contradiction by enabling adaptive transmission based on actual reception conditions.
3Measurement precision
If V2X UE selects synchronization signal based on priority, then synchronization accuracy improves, but signal processing complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-establishing the priority order of synchronization sources (GNSS > eNB > UE) before the UE needs to make a selection. This pre-determined priority structure eliminates the need for complex real-time analysis and comparison, allowing the UE to quickly select the appropriate synchronization signal based on simple priority rules. This resolves the contradiction by making accuracy achievable through straightforward priority-based selection rather than complex processing.
Data Source
AI summary
Provided is a synchronization method and apparatus in a wireless communication system. A synchronization method according to an aspect of the present disclosure may include: receiving a first synchronization signal and a second synchronization signal; determining a priority order of the first synchronization signal and the second synchronization signal; and performing synchronization based on a synchronization signal having a higher priority between the first synchronization signal and the second synchronization signal.