Sidelink COT Sharing for Reliable Low-Latency UE Transmission
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Solution Overview
Problem
In sidelink communication, particularly in unlicensed frequency spectrum, there is a challenge in maintaining channel occupancy and ensuring reliable transmission due to uncertainties in channel access and resource allocation, leading to potential loss of channel access and increased latency.
Innovation Solution
Implementing methods for resource re-evaluation and pre-emption checking, along with indicating a channel occupancy time (COT) sharing starting offset and region in sidelink control information (SCI), and ensuring a minimum time gap between consecutive-slot resources to enhance channel retention and reduce latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resource re-evaluation and pre-emption checking are performed in sidelink communication, then channel access reliability is improved, but transmission latency increases
Solution Approach 1:
The patent performs resource re-evaluation and pre-emption checking in advance before actual transmission to ensure channel availability and prevent pre-emption. By conducting these checks preliminarily, the system secures reliable channel access while minimizing the impact on transmission latency through efficient timing management.
Solution Approach 2:
The transmitting UE autonomously performs resource re-evaluation and pre-emption checking without requiring network intervention. This self-service mechanism enables the UE to independently ensure channel access reliability and maintain channel occupancy, resolving the contradiction between reliability improvement and latency increase.
2Productivity
If channel occupancy time (COT) sharing is implemented, then resource utilization is improved, but channel access uncertainty increases
Solution Approach 1:
The patent implements feedback mechanisms where the transmitting UE indicates COT sharing information to the receiving UE, including resource allocation and timing details. This feedback enables the receiving UE to accurately determine when to expect transmissions and when channel access opportunities arise, reducing uncertainty while maintaining high resource utilization through COT sharing.
3Reliability
If minimum time gap is ensured between consecutive-slot resources, then transmission reliability is improved, but channel occupancy continuity is reduced
Solution Approach 1:
The patent optimizes the minimum time gap parameter between consecutive-slot resources to balance reliability and occupancy continuity. By carefully selecting appropriate time gap values, the system ensures sufficient processing and transmission reliability while minimizing interruptions to channel occupancy, thereby maintaining efficient back-to-back transmissions.
Data Source
AI summary
A method for determining a transmission gap between user equipments (UEs) in sidelink communication includes performing, by a UE, one or more operations to indicate to another UE, an ending time slot of a sidelink transmission and/or resources selected/reserved by the UE in a shared channel occupancy. The one or more operations include a first resource re-evaluation and pre-emption checking, a second resource re-evaluation and pre-emption checking, indicating a channel occupancy time (COT) sharing starting offset and/or a COT sharing region in a sidelink control information (SCI), and/or no dropping of any sidelink (SL) transmission within a COT after a COT sharing information (COT-SI) is transmitted in the SCI from the UE.