Sidelink COT Sharing via Reserved Resource Selection in Unlicensed Band
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Solution Overview
Problem
The increasing demand for mobile broadband communication and the need for enhanced reliability and low latency in wireless communication systems, particularly in sidelink communication, is not adequately addressed by existing Radio Access Technologies, leading to challenges in managing channel occupancy times and resource allocation for efficient data transmission.
Innovation Solution
A method and device for performing wireless communication by receiving sidelink control information to determine a channel occupancy time and selecting a resource for sharing the channel occupancy time, allowing for efficient resource allocation and transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a device obtains a channel occupancy time (COT) for transmission on a first resource, then the device can transmit data without base station intervention, but other devices cannot access the channel during this period, reducing overall channel utilization
Solution Approach 1:
The patent merges the COT of the first device with the second device by allowing the second device to transmit on resources within the first device's COT period. The first device transmits COT sharing information indicating it has obtained a COT, and the second device uses this information to transmit data without performing its own channel access procedure, effectively combining their channel occupancy periods.
Solution Approach 2:
The COT obtained by the first device is made universal by allowing multiple devices (first and second devices) to utilize the same COT period for their respective transmissions. The COT information serves multiple functions: indicating channel occupancy status, enabling other devices to share the channel, and coordinating resource allocation among multiple sidelink devices.
2Reliability
If a device performs channel sensing and access procedures before transmission, then it can ensure clear channel access, but this increases transmission latency and reduces communication efficiency
Solution Approach 1:
The first device performs the channel sensing and access procedure in advance to obtain a COT, and then shares this pre-obtained COT information with the second device. The second device uses this preliminary COT information to transmit immediately without performing its own time-consuming channel access procedure, thus reducing its transmission latency while maintaining reliable channel access.
Solution Approach 2:
The COT sharing information acts as an intermediary that transfers channel access rights from the first device to the second device. Instead of the second device directly performing channel sensing and access, it receives COT information from the first device that mediates and validates its channel access, bypassing the time-consuming direct access procedure.
3Ease of operation
If multiple devices transmit on the same channel without coordination, then channel access is simple, but interference increases and transmission reliability decreases
Solution Approach 1:
The first device provides feedback to the second device by transmitting COT sharing information that indicates the duration and validity period of its COT. The second device uses this feedback information to determine whether it can transmit without causing interference, creating a feedback mechanism that coordinates channel access among multiple devices while maintaining simple operation.
Data Source
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AI summary
Provided are a method by which a first device performs wireless communication, and a device supporting same. The method may comprise the steps of: receiving first sidelink control information (SCI) including resource assignment information from a second device through a physical sidelink control channel (PSCCH); obtaining channel occupancy time (COT); on the basis of being set to share the COT for transmission on a first resource reserved by the resource assignment information, selecting a second resource which is before the first resource; and transmitting information for sharing the COT on the second resource to the second device.