V2X Sidelink Synchronization Signal Burst and Complementary Signal
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Solution Overview
Problem
Existing V2X communication systems face challenges in synchronization reliability due to the long process of sending synchronization signals through beam sweeping, leading to high time costs and out-of-synchronization issues, especially when vehicles move fast.
Innovation Solution
A synchronization signal sending method that includes sending a first and second synchronization signal burst set, each comprising multiple synchronization signal blocks, along with a complementary sidelink synchronization signal, to improve synchronization reliability and resource utilization in V2X communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If synchronization signals are sent through beam sweeping with primary and secondary signals separated, then comprehensive synchronization information can be transmitted, but the process becomes long and time costs increase
Solution Approach 1:
The patent combines primary synchronization signals and secondary synchronization signals into a single synchronization signal block, transmitted together in the same time-frequency resource. This merging eliminates the need for separate transmission of primary and secondary signals, significantly reducing the beam sweeping process duration while maintaining comprehensive synchronization information transmission.
Solution Approach 2:
The patent introduces a synchronization indication signal transmitted before the synchronization signal block to pre-indicate the presence and location of synchronization information. This preliminary action allows receiving devices to quickly locate and process synchronization signals without exhaustive searching, reducing overall synchronization time.
2Adaptability or versatility
If beam sweeping is used to transmit synchronization signals, then directional communication is achieved, but the process is comparatively long and reliability decreases when terminal devices move fast
Solution Approach 1:
The patent segments the synchronization transmission into distinct components: a brief synchronization indication signal followed by a condensed synchronization signal block containing both primary and secondary signals. This segmentation allows receiving devices to quickly acquire synchronization information at the beginning of each beam sweeping cycle, improving reliability under fast movement conditions where complete beam sweeping may not finish.
3Loss of information
If primary and secondary synchronization signals are transmitted separately at beginning and end of subframe, then complete synchronization information is provided, but time costs are comparatively high
Solution Approach 1:
The patent merges primary synchronization signals and secondary synchronization signals into a single synchronization signal block transmitted in the same time-frequency resource. This combination provides complete synchronization information (both timing and identification) in one transmission event, eliminating the time delay of separate transmissions while maintaining information completeness.
Data Source
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AI summary
This application provides a synchronization signal sending method and a communications device, and provides a synchronization signal sending method in V2X sidelink transmission communication. A complementary sidelink synchronization signal is sent in a time interval for sending synchronization signal burst sets, and is generated by using a sidelink synchronization identification of a first communications device. The complementary sidelink synchronization signal may be flexibly configured in a data frame following a synchronization signal frame, and may be sent together with sidelink control information or sidelink data. In addition, sending or skipping sending the complementary sidelink synchronization signal is optional. As a supplement to a sidelink synchronization signal, the complementary sidelink synchronization signal occupies a few resources and is sent at high frequency. Therefore, synchronization reliability can be improved when a vehicle moves fast.