Sidelink Unicast Beam Selection During Link Establishment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In sidelink communication systems using millimeter-wave frequency bands, the beam selection process is not adequately considered during the establishment of unicast links, leading to failures in sidelink transmission due to unknown transmit and receive beams.
Innovation Solution
Simultaneously transmit first information associated with a direct communication request (DCR) and channel state information reference signals (CSI-RS) to integrate the beam selection process with unicast link establishment, reducing the overall delay by combining these processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If beam-based transmission is adopted to improve transmission rate, then transmission rate is improved, but beam selection process is not considered during unicast link establishment, causing transmission failure
Solution Approach 1:
The patent performs beam selection before unicast link establishment by transmitting DCR and CSI-RS simultaneously. The receiving terminal measures the CSI-RS to determine beam quality and feeds back beam indication information, enabling the transmitting terminal to select the optimal beam in advance. This preliminary beam selection ensures that when the unicast link is established, the appropriate beam is already determined, preventing transmission failure.
2Reliability
If beam selection process is added to unicast link establishment, then beam selection is achieved, but time required for link establishment increases
Solution Approach 1:
The patent merges the beam selection process with the unicast link establishment process by transmitting the Direct Communication Request (DCR) and Channel State Information Reference Signal (CSI-RS) simultaneously. This integration allows the receiving terminal to perform beam measurement and selection during the link establishment phase itself, rather than as a separate subsequent step. The beam indication information is fed back within the same communication exchange, enabling both link establishment and beam selection to be completed in one unified process, thereby avoiding additional time delays.
Data Source
Figure 1~2
Figure 3~5
Figure 6~8B
AI summary
Provided are sidelink transmission methods and terminal devices. A method comprises a first terminal device sending first information to a second terminal device, the first information being associated with a first direct communication request (DCR), and the first information being simultaneously transmitted with one or more of the following: a first channel state information reference signal (CSI-RS); and first CSI-RS resource indication information. In the embodiments of the present application, when the first information used for unicast link establishment is transmitted, the first CSI-RS and/or the first CSI-RS resource indication information are transmitted at the same time, so as to mutually combine a unicast link establishment process with a beam selection process. Compared with a serial solution for the unicast link establishment process and the beam selection process, the present application helps to shorten the time required for executing the unicast link establishment process and the beam selection process, thus reducing time delay of sidelink transmission.