Lite Sidelink Synchronization Block for Low-Power V2X Timing
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Solution Overview
Problem
Existing sidelink wireless communications in V2X systems face inefficiencies and power consumption issues due to conventional sidelink synchronization signal block (S-SSB) transmissions, which are resource-intensive and power-consuming, especially for power-limited UEs.
Innovation Solution
The introduction of a lite SL-SS (sidelink synchronization signal) transmission that reduces the number of PSBCH symbols and allows for implicit or explicit indication of UE behavior, power level, and coverage status, optimizing synchronization without full PSBCH transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional S-SSB transmission is used, then synchronization reliability is maintained, but power consumption increases and resource efficiency decreases
Solution Approach 1:
The patent applies partial action by transmitting only the necessary synchronization signals (S-PSS and S-SSS) without the full PSBCH block. This allows receiving UEs to achieve synchronization functionality while consuming less power and occupying fewer resources, directly resolving the contradiction between maintaining reliability and reducing power consumption.
Solution Approach 2:
The patent extracts and transmits only the essential synchronization components (S-PSS and S-SSS) from the complete S-SSB structure, omitting the PSBCH part. This extraction approach maintains the core synchronization function while eliminating unnecessary power consumption and resource usage associated with full S-SSB transmission.
2Loss of information
If full S-SSB with PSBCH is transmitted, then complete synchronization information is provided, but system overhead increases
Solution Approach 1:
The patent extracts only the necessary synchronization signal components (S-PSS and S-SSS) from the complete S-SSB structure, removing the PSBCH portion. This reduces the quantity of transmitted data and system overhead while maintaining sufficient synchronization information for receiving UEs to achieve timing and frequency synchronization.
Solution Approach 2:
The patent transmits a partial S-SSB containing only the essential synchronization signals without the full PSBCH block. This partial transmission approach provides adequate synchronization information for basic synchronization operations while significantly reducing system overhead and resource consumption.
3Use of energy by moving object
If lite SL-SS transmission is used, then power savings are achieved, but synchronization signal complexity increases
Solution Approach 1:
The patent enables receiving UEs to self-determine whether they received a lite or full S-SSB based on the presence or absence of PSBCH. This self-service mechanism allows UEs to autonomously adapt to different transmission types without requiring additional signaling or increasing system complexity, thereby achieving power savings without sacrificing to signal complexity management.
Data Source
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AI summary
A method of wireless communications by a transmitting sidelink user equipment (UE) includes transmitting a sidelink synchronization signal (SL-SS) within a sidelink synchronization signal block (S-SSB). The SL-SS has an SL-SS pattern with a reduced number of physical sidelink broadcast channel (PSBCH) symbols, which may be zero PSBCH symbols. The method also includes receiving transmission in accordance with the SL-SS. The SL-SS may be transmitted at a time and/or frequency different from a legacy SL-SS.