Synchronization Signal Block Pattern Adaptation for Extended Cyclic Prefix Coverage
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Solution Overview
Problem
The coverage radius supported by the LTE normal CP length in NR V2X does not meet the required specifications, necessitating an extended CP to enhance signal coverage and reduce inter-symbol crosstalk due to multipath delay.
Innovation Solution
Implementing an SSB pattern that differs between normal and extended CP configurations, where the PBCH occupies varying OFDM symbols, and utilizing channel estimation techniques with DMRS or SSS to improve decoding success rates, ensuring adequate coverage radius for NR V2X.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If LTE normal CP length is used in NR V2X, then device complexity is reduced and compatibility is improved, but coverage radius is insufficient and inter-symbol crosstalk increases due to multipath delay
Solution Approach 1:
The patent implements dynamic SSB pattern selection based on CP configuration. When extended CP is configured, the system switches to a second SSB pattern with different OFDM symbol allocation; when normal CP is configured, it uses a first SSB pattern. This dynamic adaptation allows the system to optimize coverage radius by using extended CP with appropriate patterns while maintaining compatibility and manageable complexity through standardized pattern definitions.
Solution Approach 2:
The patent changes the SSB pattern parameters (OFDM symbol occupation) based on CP length configuration. The first SSB pattern is used with normal CP while the second SSB pattern is used with extended CP. This parameter change enables the system to achieve larger coverage radius when needed by switching to extended CP with its corresponding pattern, while avoiding unnecessary complexity when normal CP suffices.
2Length of moving object
If extended CP is configured to increase coverage radius, then coverage radius is improved and inter-symbol crosstalk is reduced, but SSB pattern complexity increases requiring different patterns for normal and extended CP
Solution Approach 1:
The system dynamically selects between first and second SSB patterns based on CP configuration. The network device configures the appropriate pattern according to whether extended or normal CP is used, and the terminal adapts accordingly. This dynamic selection resolves the contradiction by having distinct optimized patterns for each CP type rather than using a single complex pattern for all cases.
Solution Approach 2:
Different SSB patterns are designed with local optimization for their respective CP types. The first pattern is optimized for normal CP characteristics while the second pattern is optimized for extended CP characteristics. This local quality approach ensures each pattern performs optimally in its specific context without requiring a universally complex design that would handle all cases equally well.
3Reliability
If PBCH occupies different OFDM symbols in extended CP configuration, then decoding success rate is improved by reducing inter-symbol crosstalk, but signal structure complexity increases
Solution Approach 1:
The patent changes the PBCH OFDM symbol occupation parameter based on CP configuration. In extended CP mode, PBCH occupies a specific number of OFDM symbols that optimizes decoding performance by reducing inter-symbol crosstalk. In normal CP mode, a different symbol allocation is used. This parameter change approach improves reliability when extended CP is needed while maintaining simpler structures when normal CP suffices.
Solution Approach 2:
The PBCH symbol allocation is locally optimized for each CP type. The extended CP configuration uses a symbol allocation pattern specifically suited to its longer cyclic prefix characteristics, improving decoding success rate. The normal CP configuration uses a different allocation optimized for its shorter prefix. This local optimization avoids the need for a single complex allocation scheme that would try to accommodate both cases.
4Measurement precision
If time-domain repetition of PSSS/SSSS is performed to expand synchronization coverage, then detection performance is improved, but signal transmission time and resource occupation increase
Solution Approach 1:
The patent employs periodic repetition of synchronization signals (PSSS/SSSS) in the time domain. The SSB includes repeated synchronization signal instances that are transmitted periodically to expand coverage. This periodic action improves detection performance by providing multiple opportunities for successful detection while managing transmission time through controlled repetition intervals and patterns.
Data Source
AI summary
This disclosure provides a method for sending and receiving a signal, a terminal, an apparatus and a storage medium. The method includes: a sending side sending a synchronization signal block, wherein the synchronization signal block includes a primary synchronization signal, a secondary synchronization signal and a physical broadcast channel, the primary synchronization signal occupying two OFDM symbols, and the secondary synchronization signal occupying two OFDM symbols, wherein a synchronization signal block pattern used in a slot where the synchronization signal block is located is a first synchronization signal block pattern when a normal CP is configured, and is a second synchronization signal block pattern different from the first synchronization signal block pattern when an extended CP is configured. A receiving side demodulates the synchronization signal block.