UE Synchronization Priority Signaling for Low Latency V2X
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Solution Overview
Problem
Current D2D synchronization methods in V2X and V2V communication systems are inefficient due to long synchronization times, which are unsuitable for applications requiring low latency and high reliability, such as the Internet of Vehicles, and are complicated by varying synchronization sources including base stations, other UEs, and satellite devices.
Innovation Solution
A synchronization information sending method where a first UE sends priority information to a second UE, allowing it to select a synchronization source based on received synchronization information, ensuring high precision and reliability by indicating frequency and timing alignment with a satellite or base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If D2D synchronization method is used in V2X/V2V systems, then synchronization can be achieved between UEs, but synchronization time is excessively long (several hundreds of milliseconds)
Solution Approach 1:
The patent applies preliminary action by having UEs pre-obtain synchronization information from multiple potential synchronization sources (base stations, other UEs, satellite devices) before actual communication is needed. This pre-synchronization approach allows UEs to have synchronization data ready in advance, significantly reducing the synchronization time from several hundreds of milliseconds to much shorter durations, while maintaining high synchronization stability through pre-established references.
2Adaptability or versatility
If multiple synchronization sources are supported (base station, other UE, satellite device), then synchronization adaptability is improved, but synchronization source selection complexity increases
Solution Approach 1:
The patent implements self-service by enabling UEs to autonomously select synchronization sources based on pre-configured priority relationships. Each UE independently determines the best synchronization source using locally stored priority information without requiring complex network coordination or centralized control. The priority configuration (e.g., base station > satellite device > other UE) is pre-established, allowing UEs to automatically make optimal selection decisions, thereby reducing selection complexity while maintaining high adaptability to different synchronization scenarios.
3Measurement precision
If priority information is indicated in synchronization information, then synchronization source selection accuracy is improved, but information transmission overhead increases
Solution Approach 1:
The patent extracts only the essential priority information from complete synchronization data and transmits it separately as priority indication information. Instead of transmitting full synchronization information with embedded priority details, the system separates priority indicators from the actual synchronization signals. This extraction approach provides accurate synchronization source selection guidance while minimizing information transmission overhead, as only compact priority indicators rather than complete synchronization datasets need to be transmitted.
Data Source
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AI summary
Embodiments of the present invention provide a synchronization information sending method and apparatus, and relate to the communications field, to ensure relatively high precision of synchronization between devices in a scenario of ultra-reliable and low latency communications, and further improve efficiency of communication between the devices. The method include: determining, by first user equipment UE, first synchronization information, where the first synchronization information is used to indicate a priority of the first UE used as a synchronization source; and sending, by the first UE, the first synchronization information, so that second UE selects a synchronization source of the second UE according to the received first synchronization information.