Best Sidelink Beam Selection Through Multi-Beam RS Feedback
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Solution Overview
Problem
Existing wireless communication systems face challenges in determining optimal beam alignment for sidelink (SL) communication, particularly in higher frequency ranges like FR2, where synchronization signal blocks are not universally transmitted, necessitating new techniques for beam management in unicast SL transmission.
Innovation Solution
The proposed solutions involve configuring a sidelink reference signal (SL RS) for beam establishment transmission using multiple transmit beams, receiving feedback from the receiving UE (Rx UE) to determine a best transmit beam, and establishing unicast connections based on this feedback, which can be performed before, during, or after higher-layer discovery procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If beam establishment procedures are implemented for unicast SL transmission, then beam alignment precision is improved, but device complexity increases due to multiple transmit beams and feedback mechanisms
Solution Approach 1:
The system performs beam establishment procedures in advance before actual data transmission. The Tx UE transmits SL RS using multiple transmit beams and the Rx UE provides feedback about the best receive beam, so that when data transmission begins, the optimal beam pair is already established, improving alignment precision while managing complexity through preliminary configuration
Solution Approach 2:
The Rx UE measures the SL RS received on different receive beams and provides feedback information to the Tx UE indicating the best receive beam. This feedback mechanism enables the Tx UE to identify the optimal transmit beam, achieving precise beam alignment through iterative measurement and adjustment
2Measurement precision
If multiple transmit beams are used for SL RS transmission, then beam alignment accuracy is improved, but time consumption increases due to multiple transmissions
Solution Approach 1:
The SL RS is transmitted periodically using different transmit beams in a beam sweeping manner. Each transmission opportunity allows the Rx UE to measure a specific beam, and this periodic repetition enables comprehensive beam evaluation while structuring the time consumption in manageable intervals
Solution Approach 2:
Beam alignment is performed in advance during a dedicated beam establishment phase before data transmission begins. By completing multiple beam transmissions and measurements beforehand, the system achieves accurate beam alignment without delaying the actual data communication
3Productivity
If beam establishment is performed before discovery procedures, then connection setup efficiency is improved, but system complexity increases due to coordination requirements
Solution Approach 1:
The beam establishment procedure using SL RS transmission and feedback is performed before higher-layer discovery procedures. This preliminary beam configuration establishes the optimal physical layer connection in advance, enabling more efficient subsequent discovery and data transmission phases
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for determining a best beam for SL communication. One method (800) at a transmitting entity includes configuring (805) a SL RS for beam establishment transmission and performing (810) a plurality of transmissions of the SL RS, where each of the plurality of transmissions is associated with a different spatial direction, and where each of the plurality of transmissions is performed using one of a plurality of transmit beams. The method (800 includes) receiving (815) a feedback transmission from a Rx UE, where the feedback transmission indicates support of beam correspondence at the Rx UE, and determining (820) a best transmit beam of the plurality of transmit beams based on the received feedback transmission.