Sidelink CSI-RS Beam Selection for Higher-Rate Terminal Transmission
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Solution Overview
Problem
Current protocols have not discussed how to support beam-based transmission in sidelink systems, which is necessary for enhancing transmission rates and network coverage, especially in high-frequency bands.
Innovation Solution
Implement beam-based transmission in sidelink systems by using channel state information-reference signals (CSI-RS) for beam determination, where terminal devices transmit and receive CSI-RS to select optimal transmission and reception beams, and adjust CSI-RS transmission mechanisms to improve efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If beam-based transmission is adopted to enhance transmission rate, then transmission rate is improved, but protocol complexity increases because current protocols have not discussed how to support beam-based transmission
Solution Approach 1:
The patent applies preliminary action by having the first terminal device transmit CSI-RS signals before actual data transmission occurs. This allows the second terminal device to perform beam measurement and selection in advance, determining the optimal beam pair before communication begins. The CSI-RS transmission is configured with specific periodicity and timing relationships to enable this preliminary beam determination process.
Solution Approach 2:
The patent uses CSI-RS (Channel State Information-Reference Signal) as an intermediary element to enable beam-based transmission. The CSI-RS serves as a mediator between the transmitting and receiving terminals, allowing them to exchange channel state information and determine optimal beam configurations without directly implementing complex beamforming protocols yet.
2Adaptability or versatility
If CSI-RS transmission is configured for beam determination, then beam selection capability is improved, but transmission time is increased due to periodic or semi-persistent CSI-RS transmission requirements
Solution Approach 1:
The patent implements periodic action by configuring CSI-RS transmission to occur at regular intervals rather than continuously. The first terminal device transmits CSI-RS signals periodically or semi-persistently, allowing the second terminal device to perform beam measurements at these configured intervals. This periodic transmission reduces time loss compared to continuous transmission while maintaining adequate beam selection capability.
Solution Approach 2:
The patent applies dynamics by allowing flexible configuration of CSI-RS transmission parameters including periodicity, offset, and activation/deactivation mechanisms. The system can dynamically adjust when CSI-RS is transmitted based on beam selection needs, transitioning from static continuous transmission to dynamic on-demand transmission patterns.
Data Source
AI summary
Provided is a method and terminal device for sidelink transmission. The method includes: a first terminal device or a second terminal device determining a first CSI-RS resource; the first CSI-RS resource is a periodic or semi persistent sidelink CSI-RS resource; the first terminal device is configured to send CSI-RS, and the second terminal device is configured to receive CSI-RS.