Sidelink COT Sharing for Reliable Unlicensed Channel Access
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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 (SL) communication, necessitates efficient channel access mechanisms to manage channel occupancy times (COT) and determine the type of channel access for SL transmission.
Innovation Solution
A method and device for obtaining information related to channel occupancy time (COT) and determining the type of channel access based on satisfied conditions to perform sidelink (SL) transmission, including the transmission of sidelink control information (SCI) for scheduling physical sidelink shared channels (PSSCH) and PSCCH.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If channel occupancy time (COT) sharing is implemented in sidelink communication, then communication efficiency and resource utilization are improved, but channel access complexity and determination conditions increase
Solution Approach 1:
The patent segments the channel access determination into distinct conditions: checking whether the UE is in COT sharing mode, evaluating whether uplink transmission is scheduled, and determining whether downlink transmission is received. This segmentation simplifies the complex decision-making process by breaking it into manageable steps, thereby reducing channel access complexity while maintaining communication efficiency
Solution Approach 2:
The patent establishes preliminary determination conditions that must be evaluated before channel access is granted. By pre-defining the conditions (COT sharing mode status, uplink scheduling status, downlink reception status), the system prepares the decision framework in advance, reducing real-time complexity while enabling efficient resource utilization
2Reliability
If strict channel access determination conditions are applied, then channel access reliability is improved, but transmission latency increases
Solution Approach 1:
The patent applies partial action by selectively evaluating only the necessary conditions for channel access determination. Instead of requiring all possible checks, the system evaluates specific conditions (COT sharing mode, uplink scheduling, downlink reception) that are sufficient for reliable decision-making, thereby reducing latency while maintaining reliability
Solution Approach 2:
The patent changes the parameter of condition evaluation from exhaustive checking to targeted assessment of key parameters. By focusing on critical parameters (whether UE is in COT sharing mode, whether uplink is scheduled, whether downlink is received), the system achieves reliable channel access determination with reduced processing time and latency
Data Source
AI summary
Provided are a method by which a first device performs wireless communication and an apparatus supporting same. The method comprises the steps of: acquiring information related to a channel occupancy time (COT), the information related to the COT including information related to a condition for determining whether or not to share the COT; on the basis of whether or not the condition is satisfied, determining a type of channel access; and on the basis of the channel access, determining whether or not to perform sidelink (SL) transmission, wherein the SL transmission may include transmission of first sidelink control information (SCI) for scheduling of a physical sidelink shared channel (PSSCH) and second SCI, via a physical sidelink control channel (PSCCH), and transmission of the second SCI via the PSSCH.