Sidelink Channel Access Selection Within Shared COT
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Solution Overview
Problem
In sidelink communication systems operating over unlicensed or shared spectra, there is a lack of clear guidance on which channel access type other terminal devices should use when sharing a channel occupancy time (COT) with a first device, affecting data transmission performance.
Innovation Solution
A wireless communication method and terminal devices that allow a first terminal to select an appropriate channel access type based on predefined or configured information, such as sidelink subcarrier spacing, detection results, and indication information, to optimize channel access within a COT shared from a second terminal device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a terminal device sends a first message containing first indication information and a second message containing second indication information to establish a PSCell, then the PSCell can be established for dual connectivity, but the signaling overhead increases and the establishment process becomes more complex
Solution Approach 1:
The patent combines the first indication information and second indication information into a single first message transmitted from the first terminal device to the network side device. This merging of information reduces the number of separate signaling messages, simplifies the establishment process, and decreases signaling overhead while still enabling PSCell establishment for dual connectivity.
2Reliability
If the terminal device transmits indication information in separate messages, then the network can process information step-by-step, but the time required for PSCell establishment increases
Solution Approach 1:
The patent applies preliminary action by including both first indication information and second indication information in the initial first message transmitted from the terminal device to the network side device. This allows the network to receive and process all necessary information for PSCell establishment in advance, reducing the overall establishment time while maintaining processing reliability through structured information organization.
3Adaptability or versatility
If the terminal device uses existing message formats for PSCell establishment, then compatibility with existing networks is maintained, but the signaling overhead and processing complexity increase
Solution Approach 1:
The patent applies universality by designing the first message to serve multiple functions: it carries both first indication information (related to first terminal device) and second indication information (related to second terminal device), and can be used for both PSCell establishment and subsequent configuration adjustments. This multi-functional message design reduces signaling overhead and simplifies processing while maintaining network compatibility.
Data Source
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AI summary
The embodiments of the present application provide a wireless communication method, a first terminal device, and a second terminal device. The method includes: obtaining a first transmission opportunity for the first terminal device, where a time unit where the first side transmission opportunity is located is within a COT shared from a second terminal device; and determining a target channel access type to be used by the first terminal device according to first information. The first information includes at least one of the following information: a first sidelink SCS; first indication information used to indicate a first channel access type and/or a first duration; a detection result directed to the second sidelink transmission opportunity; a first gap between a start time of the first sidelink transmission opportunity and an end time of a second sidelink transmission opportunity; or a channel type of a channel to be transmitted. The method provided by the present application allows the first terminal device to select an appropriate channel access type for channel access when using a COT shared from the second terminal device, thereby improving data transmission performance.