Unlicensed Sidelink COT Sharing via Resource Indication
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Solution Overview
Problem
In unlicensed sidelink (SL-U) transmission systems, terminal devices may be hidden from each other, leading to simultaneous channel access and interference, which decreases communication reliability.
Innovation Solution
A method for channel occupancy time (COT) sharing, where a second terminal device receives a resource indication from a first terminal device, performs Listen Before Talk (LBT), and shares the COT with the first terminal device if successful, allowing the first terminal device to perform channel access without interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If terminal devices perform independent LBT in unlicensed sidelink transmission, then each device can autonomously access the channel, but hidden terminal problems occur leading to simultaneous channel access and interference
Solution Approach 1:
The patent introduces a base station as an intermediary to coordinate channel access in unlicensed sidelink transmission. The base station schedules transmission resources for terminal devices and manages channel access, preventing hidden terminal problems while maintaining autonomous operation benefits. This mediator resolves the conflict between independent access and reliable communication.
2Device complexity
If terminal devices perform LBT independently without coordination, then device complexity is reduced, but channel access conflicts and interference increase
Solution Approach 1:
The base station acts as a central coordinator that reduces individual terminal device complexity by handling channel access coordination centrally. Terminal devices simply follow base station scheduling decisions, avoiding the need for complex distributed coordination algorithms while minimizing channel interference through centralized resource management.
3Adaptability or versatility
If all terminal devices perform LBT before transmission in unlicensed spectrum, then regulatory requirements are met, but hidden terminals cause simultaneous access and transmission interference
Solution Approach 1:
The base station intermediary maintains regulatory compliance by ensuring all terminal devices perform LBT before transmission in unlicensed spectrum, while simultaneously improving reliability through coordinated resource allocation. The base station schedules transmissions to avoid hidden terminal conflicts, allowing LBT to be performed systematically rather than independently, thus meeting regulatory requirements while preventing interference.
Data Source
AI summary
A method and a terminal device are provided. The method includes the following. A second terminal device receives a resource indication transmitted by a first terminal device, and determines, according to the resource indication, a transmission resource(s) indicated by the first terminal device. The second terminal device performs listen before talk (LBT) according to the transmission resource(s) indicated. A COT is shared to the first terminal device in the case where the LBT performed by the second terminal device succeeds.