Sidelink Beam Training Using Multiplexed Reference Signals
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Solution Overview
Problem
In existing NR sidelink systems, half-duplex issues arise during beam training due to the use of synchronized sidelink-synchronization signal blocks (S-SSBs) by multiple terminals, leading to inefficiencies and increased signaling overheads.
Innovation Solution
Implement beam training by multiplexing demodulation reference signals of PSSCH or PSCCH, using PSFCH for feedback, and reserving non-overlapping beam feedback resources to reduce signaling overheads and simplify communication design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If S-SSB is used for beam training, then beam training can be performed, but severe half-duplex problems occur
Solution Approach 1:
The patent extracts the beam training function from the S-SSB block and implements it separately using reference signals multiplexed on PSSCH or PSCCH. This separation allows beam training to occur independently without interfering with the synchronization function of S-SSB, thereby resolving the half-duplex conflict while maintaining beam training capability.
2Ease of operation
If S-SSB is configured outside resource pool with consistent configuration for all SL terminals, then synchronization can be achieved, but severe half-duplex problems occur during beam training
Solution Approach 1:
The patent segments the communication functions by separating synchronization (handled by S-SSB outside resource pool) from beam training (handled by reference signals within resource pool). This segmentation allows each function to operate independently with optimized resource allocation, eliminating the half-duplex conflict while maintaining ease of synchronization.
3Measurement precision
If beam training is performed using separate reference signals, then beam training accuracy improves, but signaling overheads increase
Solution Approach 1:
The patent merges the beam training reference signals with existing data channels (PSSCH) or control channels (PSCCH) by multiplexing them in the time-frequency domain. This combining approach allows beam training to be performed using existing channel resources without requiring separate dedicated reference signal resources, thereby maintaining measurement accuracy while minimizing signaling overhead.
4Loss of information
If additional feedback resources are introduced for beam measurement results, then feedback capability improves, but system complexity increases
Solution Approach 1:
The patent makes the PSFCH channel multi-functional by enabling it to carry both traditional feedback information (HARQ-ACK, CSI) and beam measurement results. This universal approach allows a single feedback channel to handle multiple types of information, improving feedback capability while avoiding the need for additional dedicated feedback resources and reducing system complexity.
Data Source
AI summary
This application discloses a beam training method and apparatus, a system, and a storage medium. A first terminal sends a first RS to a second terminal on a first beam, and receives first indication information sent by the second terminal on a PSFCH or a PSSCH. Alternatively, a first terminal sends first RSs to a second terminal on M beams corresponding to M resources. The second terminal measures N first RSs to obtain N pieces of beam feedback information, and sends at least one piece of beam feedback information to the first terminal on at least one of the N beam feedback resources. The first RS is a demodulation RS of the PSSCH or the PSCCH. In this application, beam training is performed by multiplexing a demodulation reference signal of a PSSCH or a PSCCH, so that beam training can be implemented, and signaling overheads are reduced.