Sidelink COT Time Sharing for Unlicensed Channel Access
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently sharing channel occupancy times (COT) among user equipment (UEs) in sidelink communications, particularly in unlicensed frequency bands, due to regulatory restrictions and varying channel access priorities.
Innovation Solution
Implementing a listen-before-talk (LBT) procedure for UEs to acquire and share COTs based on successful channel access, using COT sharing information that includes identifiers and channel access priority classes, allowing UEs to coordinate channel access and sharing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple UEs independently perform LBT procedures to access the channel in unlicensed bands, then each UE can autonomously access the channel, but channel contention increases and spectral efficiency deteriorates
Solution Approach 1:
Multiple UEs merge their channel access operations by sharing a single COT. The initiating UE performs LBT and acquires COT, then shares it with other UEs through COT sharing information exchange. This combining approach reduces the number of independent LBT procedures from multiple UEs to just one, thereby reducing channel contention while maintaining autonomous access capability.
Solution Approach 2:
The initiating UE performs the LBT procedure and acquires COT in advance before other UEs need to access the channel. By preparing the COT beforehand and sharing it with other UEs through COT sharing information, the system eliminates the need for other UEs to perform separate LBT procedures, thus improving spectral efficiency while maintaining operational autonomy.
2Productivity
If UEs share COT information to coordinate channel access, then channel contention is reduced and spectral efficiency improves, but communication overhead and system complexity increase
Solution Approach 1:
The COT sharing mechanism is segmented into distinct functional components: COT indication information (transmitted by the initiating UE), COT sharing information (exchanged between UEs), and COT utilization procedures. This segmentation allows each component to be independently managed and processed, reducing the overall system complexity while maintaining the spectral efficiency benefits of coordinated access.
Solution Approach 2:
COT sharing information acts as an intermediary mechanism that enables coordinated channel access without requiring complex direct negotiation between UEs. The information structure includes essential elements (UE identifiers, COT duration, resource allocations) that mediate the interaction between UEs, simplifying the coordination process while achieving improved spectral efficiency.
3Manufacturing precision
If COT sharing information includes detailed resource allocation data, then resource allocation precision improves, but information overhead and processing complexity increase
Solution Approach 1:
The COT sharing information structure applies local quality by including detailed resource allocation data only where necessary. The information includes UE-specific parameters (identifiers, resource allocations, power control) for each sharing UE, while using更高效 formats for common parameters. This selective detail approach maintains resource allocation precision for critical elements while minimizing overall information overhead.
Solution Approach 2:
The patent implements partial action by including only the essential elements needed for COT sharing in the information structure. Rather than transmitting complete resource allocation details for all possible parameters, the system includes only the necessary components (UE identifiers, COT duration, key resource allocations), achieving sufficient precision while reducing information overhead and processing complexity.
Data Source
AI summary
Wireless communications systems, apparatuses, and methods are provided. A method of wireless communication performed by a first sidelink user equipment (UE) may include performing a listen-before-talk (LBT) procedure, acquiring, based on the LBT procedure being successful, a channel occupancy time (COT), and transmitting, to a second sidelink UE during the COT, COT sharing information for sharing the COT with the second sidelink UE.