Sidelink Beam Management Using S-SSB Feedback in FR2
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Solution Overview
Problem
Existing sidelink communication systems face challenges in selecting optimal transmission and reception beams, particularly in high-frequency bands like FR2, which affect communication performance and reliability.
Innovation Solution
A method and apparatus for beam management in sidelink communication that involves transmitting synchronization signal blocks (S-SSBs), performing monitoring operations on response resources, and determining optimal transmission and reception beams based on measurement results and configuration information, using channel and zone-based methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam-based sidelink communication is performed in FR2 band, then communication performance is improved, but difficulty in detecting and measuring optimal beams increases
Solution Approach 1:
The patent implements feedback mechanisms where receiving terminals send response signals (e.g., S-SSB response signals) to transmitting terminals indicating which synchronization signal blocks were successfully detected. This feedback loop enables transmitting terminals to identify optimal beams without exhaustive measurement, resolving the contradiction by making beam detection easier through targeted feedback while maintaining FR2 communication performance
Solution Approach 2:
The patent uses preliminary beam sweeping where transmitting terminals transmit multiple S-SSBs using different beams before actual data communication. Receiving terminals measure these preliminary transmissions and provide feedback, allowing optimal beams to be predetermined. This preliminary action reduces the complexity of real-time beam detection while maintaining high FR2 communication performance
2Measurement precision
If multiple S-SSBs are transmitted for beam selection, then optimal beam determination is improved, but use of energy increases
Solution Approach 1:
The patent transmits a limited number of S-SSBs (e.g., 1, 2, or 4 beams) rather than exhaustive beam sweeping. This partial action provides sufficient measurement precision for beam selection while significantly reducing energy consumption compared to transmitting all possible beams, resolving the contradiction between measurement accuracy and energy usage
Solution Approach 2:
The patent implements periodic S-SSB transmission where beams are transmitted at specific intervals rather than continuously. This periodic approach maintains beam selection accuracy by periodically updating beam information while reducing overall energy consumption by avoiding continuous transmission, balancing measurement precision with energy efficiency
3Measurement precision
If response resources are allocated for each S-SSB, then beam management precision is improved, but device complexity increases
Solution Approach 1:
The patent uses PSFCH (Physical Sidelink Feedback Channel) resources that serve dual purposes: carrying both HARQ-ACK feedback and S-SSB response signals. This multi-functionality allows precise beam management through dedicated response resources while reducing device complexity by avoiding separate resource allocations, resolving the contradiction between management precision and complexity
Solution Approach 2:
The patent merges the feedback channel resources for HARQ-ACK and S-SSB responses into a unified PSFCH resource structure. By combining these functions into single resources with appropriate multiplexing, the system achieves precise beam management through dedicated response indication while simplifying device complexity through resource consolidation rather than proliferation
Data Source
AI summary
An operation method of a first terminal may include: transmitting a plurality of sidelink-synchronization signal blocks (S-SSBs); performing a monitoring operation on a plurality of response resources associated with the plurality of S-SSBs; receiving a first response signal from a second terminal in a first response resource among the plurality of response resources; identifying a first S-SSB associated with the first response resource among the plurality of S-SSBs; and determining a first transmission beam through which the first S-SSB is transmitted among a plurality of transmission beams of the first terminal as an optimal transmission beam.