Beam-Based Sidelink Synchronization for Preferred Beam Selection
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Solution Overview
Problem
Existing sidelink communication technologies face challenges in efficiently utilizing beamforming techniques for reliable high-speed data transmission in higher frequency bands, particularly in Vehicle-to-Everything (V2X) communication, where optimal beam selection and management are lacking.
Innovation Solution
A method and apparatus for beam-based sidelink communication involving the transmission of synchronization signal blocks (S-SSBs) with an initial beam pairing flag, allowing terminals to select and use a preferred beam for data transmission, and include CSI-RS and SCI for beam management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If beamforming technique is used for high-speed data transmission in higher frequency bands, then data transmission speed and reliability are improved, but beam selection and management complexity increases
Solution Approach 1:
The transmitting terminal performs beam sweeping in advance by transmitting multiple S-SSBs through different beams before actual data transmission. This preliminary beam training allows the receiving terminal to identify the preferred beam, thereby resolving the beam selection complexity during actual data transmission while maintaining high transmission speed.
Solution Approach 2:
The receiving terminal provides feedback information about the preferred beam to the transmitting terminal. This feedback mechanism enables the transmitting terminal to adaptively select the optimal beam for data transmission, improving transmission reliability while managing beam selection complexity through structured feedback rather than exhaustive search during data transmission.
2Reliability
If multiple S-SSBs are transmitted through beam sweeping for optimal beam selection, then communication reliability is improved, but transmission time and resource consumption increase
Solution Approach 1:
The beam training process is segmented into distinct phases: initial beam pairing phase where multiple S-SSBs are transmitted through different beams, and subsequent data transmission phase using the identified preferred beam. This segmentation allows comprehensive beam evaluation to be completed in a dedicated training period, ensuring communication reliability while containing the time overhead to a specific phase rather than continuously during data transmission.
3Reliability
If beam pairing flag is set to indicate non-synchronization reference terminal, then synchronization management is improved, but signaling overhead increases
Solution Approach 1:
The beam pairing flag is extracted as a separate indicator within the S-SSB structure, specifically using reserved bits in the PSBCH payload. This extraction allows the flag to be independently set and interpreted, improving synchronization management by clearly identifying non-synchronization reference terminals while minimizing overhead by utilizing already-allocated reserved bits rather than adding separate signaling messages.
Data Source
AI summary
A method of a transmitting terminal may include: setting an initial beam pairing flag indicating that the transmitting terminal transmitting sidelink-synchronization signal blocks (S-SSBs) is not a synchronization reference terminal; transmitting a plurality of S-SSBs including the initial beam pairing flag in a beam sweeping scheme; receiving, from a receiving terminal, information on a preferred beam among a plurality of beams through which the plurality of S-SSBs are transmitted; and transmitting data to the receiving terminal using the preferred beam.