Synchronization Signal Block Grouping for 5G V2X Latency Reduction
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Solution Overview
Problem
The introduction of SSB beam-sweeping or beam repetition in 5G NR V2X systems results in multiple synchronization signal blocks being transmitted in one synchronization period, leading to potential large latency, which is adverse to real-time transmission of V2X service data.
Innovation Solution
A signal transmission method where P synchronous signal blocks SSBs are transmitted in a synchronous period, divided into Q groups, with the time-domain location of at least one SSB preconfigured or carried through a physical broadcast channel PBCH, to improve the detection success rate of synchronization signal blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SSB beam-sweeping or beam repetition is introduced in 5G NR V2X systems to transmit multiple synchronization signal blocks, then the detection success rate of synchronization signal blocks is improved, but the transmission delay increases
Solution Approach 1:
The P synchronous signal blocks are divided into Q groups, where each group contains at least one SSB. This segmentation allows the terminal to detect synchronization signals in multiple groups within a synchronization period, improving detection success rate while managing transmission delay through structured organization of signal blocks across different time-domain locations
Solution Approach 2:
The time-domain location of at least one SSB in each group is preconfigured or indicated through physical broadcast channel PBCH before the terminal attempts detection. This preliminary provision of location information enables the terminal to efficiently locate and detect synchronization signal blocks without exhaustive searching, thereby improving detection success rate while minimizing transmission delay
2Adaptability or versatility
If multiple synchronization signal blocks are transmitted in one synchronization period through beam-sweeping, then synchronization coverage is improved, but the latency increases which is adverse to real-time transmission
Solution Approach 1:
The system transmits P synchronous signal blocks periodically within a synchronization period, divided into Q groups with predefined time-domain locations. This periodic structure ensures comprehensive synchronization coverage across different beam directions while maintaining predictable and controlled latency through the organized transmission schedule of signal blocks
Solution Approach 2:
The time-domain locations of SSB groups are preconfigured or indicated through PBCH before transmission. This allows terminals to anticipate where to find synchronization signals, improving synchronization coverage across multiple beams while avoiding the latency that would result from blind searching or sequential beam sweeping
Data Source
AI summary
Signal transmission method and device, signal reception method and device and a terminal are provided. The signal transmission method includes: transmitting P synchronous signal blocks SSBs in a synchronous period, wherein the P SSBs are divided into Q groups, any of the Q groups includes at least one SSB, both P and Q are positive integers greater than or equal to 1; when a synchronization period includes at least two SSBs, a time-domain location of at least one of the SSBs is preconfigured or carried through a physical broadcast channel PBCH.