Sidelink UE Resource Allocation for Shared COT Channel Access
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Solution Overview
Problem
Sidelink communication in unlicensed frequency spectrum faces challenges with inter-UE blocking during channel access, leading to increased latency, resource collisions, and reduced reliability due to the need for individual UEs to perform type 1 LBT procedures, which are prone to blocking when other UEs are transmitting.
Innovation Solution
User equipment (UE) identifies candidate reserved resources to share or utilize a shared channel occupancy time (COT) with other UEs, reducing the burden of type 1 LBT procedures and minimizing inter-UE blocking through collaborative resource selection and channel access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If individual UEs perform type 1 LBT procedures for channel access, then channel access control is maintained, but inter-UE blocking increases leading to increased latency and reduced reliability
Solution Approach 1:
The patent merges the channel occupancy time (COT) of multiple UEs into a shared COT structure. Instead of each UE independently performing type 1 LBT procedures, the system combines their access attempts into a coordinated shared COT, where UEs can transmit without individually undergoing the full LBT process. This reduces inter-UE blocking and latency while maintaining access control through the shared reservation mechanism.
2Reliability
If individual UEs perform type 1 LBT procedures, then channel access is controlled, but resource collisions increase due to blocking when other UEs are transmitting
Solution Approach 1:
The patent implements preliminary resource reservation where UEs reserve resources in advance before actual transmission. By performing resource selection and reservation beforehand, UEs can identify and secure appropriate time-frequency resources ahead of time, reducing the likelihood of collisions during actual data transmission. This preliminary action allows UEs to avoid harmful interference without needing to perform repeated LBT procedures.
3Loss of time
If UEs share or utilize shared COT from candidate reserved resources, then inter-UE blocking is minimized, but coordination complexity increases
Solution Approach 1:
The patent employs feedback mechanisms where UEs transmit control information indicating their selected resources and COT status. Other UEs receive this feedback and adjust their own resource selection accordingly. This feedback loop enables coordinated shared COT utilization without requiring complex centralized control, as each UE independently responds to feedback signals to avoid collisions and optimize access timing.
Data Source
AI summary
A method of resource allocation and channel access in sidelink communication by a user equipment (UE) includes identifying, by the UE, one or more candidate reserved resources, wherein the UE is configured to share its channel occupancy time (COT) with the one or more candidate reserved resources, or the UE is configured to utilize a shared COT from the one or more candidate reserved resources.