S-SSB Transmission Resource Allocation in NR V2X
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing sidelink synchronization signals for Vehicle-to-Everything (V2X) communication, particularly in Next Generation Radio Access Technology (NR) networks, where reliable and low-latency communication is crucial for safety services like vehicle platooning, advanced driving, and remote driving.
Innovation Solution
The method involves transmitting sidelink synchronization signal blocks (S-SSBs) in NR V2X communication, using primary and secondary scrambling sequences for the physical sidelink broadcast channel (PSBCH) to improve decoding performance and resource allocation efficiency, allowing for better synchronization and system information dissemination among vehicles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple S-SSBs are transmitted within an S-SSB period to improve synchronization reliability, then the synchronization reliability is improved, but the resource consumption and system complexity increase
Solution Approach 1:
The S-SSB transmission is segmented into multiple individual S-SSBs within an S-SSB period, where each S-SSB carries partial or different synchronization information. This segmentation allows the system to achieve reliable synchronization through multiple transmissions while managing complexity by dividing the overall transmission task into manageable units with specific functions.
Solution Approach 2:
Multiple S-SSBs are transmitted periodically within an S-SSB period according to a predetermined pattern. The periodic transmission ensures that synchronization information is repeatedly available to receiving UEs, improving reliability while the structured periodic nature helps manage system complexity through predictable resource allocation.
2Measurement precision
If S-SSBs are transmitted frequently to improve synchronization accuracy, then the synchronization accuracy is improved, but the overhead and resource usage increase
Solution Approach 1:
Instead of transmitting full synchronization information in every S-SSB, the patent uses partial action by transmitting only essential synchronization elements in certain S-SSBs and using differential or incremental information in others. This reduces the overhead per transmission while maintaining cumulative synchronization accuracy through multiple receptions.
Solution Approach 2:
Multiple S-SSBs transmit complementary synchronization information that, when combined by the receiving UE, achieves high synchronization accuracy. The merging of information from multiple S-SSBs allows the system to reach precise synchronization without requiring any single S-SSB to contain all synchronization data, thereby reducing individual overhead.
3Reliability
If scrambling sequences are applied to PSBCH to improve decoding performance, then the decoding performance is improved, but the processing complexity increases
Solution Approach 1:
Different scrambling sequences or scrambling parameters are applied to different S-SSBs or different parts of the PSBCH based on predetermined rules. This parameter variation improves decoding performance by reducing correlation between repeated transmissions and enabling better signal discrimination, while the use of standardized scrambling algorithms keeps processing complexity manageable.
Data Source
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AI summary
According to an embodiment of the present disclosure, provided is a method by which a first apparatus performs sidelink communication. The method comprises the steps of: receiving, from a base station, information about an S-SSB transmission resource; determining, on the basis of the information about the S-SSB transmission resource, a plurality of first slots within a first S-SSB period having an S-SSB period length, associated with a plurality of first S-SSBs; transmitting, to a second apparatus, the plurality of first S-SSBs on the plurality of first slots, wherein a slot interval between the plurality of first slots may be the same within the first S-SSB period.