Group-Aware Sidelink Resource Sharing with Tailored LBT
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Solution Overview
Problem
Existing sidelink communication technologies face challenges in managing resource allocation among multiple user equipment (UEs), leading to collisions and delays, particularly in dense deployments, especially for time-sensitive data transmissions.
Innovation Solution
Implementing a method where a first UE determines available sidelink channels and reserves resources for intra-group and inter-group sharing, using different LBT procedures for different groups, with SCI indicating priority thresholds and packet delay budgets to facilitate efficient resource utilization among UEs within and outside the group.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple UEs share sidelink resources in dense deployments, then resource utilization efficiency is improved, but collisions and delays increase
Solution Approach 1:
The patent segments the sidelink resources into three distinct types: resources reserved for the initiating UE, intra-group sharable resources, and inter-group sharable resources. This segmentation allows different UEs to access appropriate resources based on their group membership and priority levels, reducing collisions while maintaining high resource utilization efficiency in dense deployments
Solution Approach 2:
The patent applies local quality by assigning different access characteristics to different resource sets. Intra-group sharable resources use more permissive LBT procedures (CAT 1 or CAT 2) to enable efficient access within groups, while inter-group sharable resources use stricter LBT procedures (CAT 4) to manage access from outside groups. This localized differentiation resolves the contradiction by optimizing for both efficiency and reliability in different resource contexts
2Speed
If intra-group UEs use permissive LBT procedures to access resources, then access speed is improved, but interference with inter-group UEs increases
Solution Approach 1:
The patent divides resources into intra-group sharable resources and inter-group sharable resources with distinct access rules. Intra-group UEs use permissive LBT procedures (CAT 1 or CAT 2) for intra-group resources to achieve fast access, while inter-group resources are protected by requiring CAT 4 LBT procedures, thus preventing fast intra-group access from causing harmful interference to inter-group UEs
Solution Approach 2:
The patent introduces an intermediary mechanism where the initiating UE transmits SCI messages that indicate which resources are available for inter-group sharing and under what conditions. This intermediary signaling allows intra-group UEs to access resources quickly while ensuring that inter-group UEs can also access resources when appropriate, resolving the interference issue through coordinated resource indication
3Reliability
If UEs perform CAT 4 LBT procedure before transmission, then collision avoidance is improved, but access delay increases
Solution Approach 1:
The patent segments resources based on LBT procedure requirements: intra-group sharable resources are accessible with permissive LBT procedures (CAT 1 or CAT 2) that minimize access delay while maintaining adequate collision avoidance, whereas inter-group sharable resources require CAT 4 LBT procedures for stricter collision avoidance. This segmentation allows UEs to choose the appropriate LBT procedure based on the resource type and priority requirements
Solution Approach 2:
The patent changes the LBT procedure parameter (from CAT 4 to CAT 1 or CAT 2) based on the resource type and UE group membership. By adjusting the LBT procedure parameter according to whether resources are intra-group or inter-group sharable, the system optimizes the balance between collision avoidance and access delay for different transmission scenarios
Data Source
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AI summary
A first UE in a UE group may determine that a sidelink channel is available for data transmission and transmit SCI reserving a COT on the sidelink channel. A second may receive, from the first UE, the SCI reserving the COT on the sidelink channel and transmitting the sidelink transmission on the sidelink channel using one or more resources of the inter-group sharable resources. The COT may include a first set of resources reserved for the first UE, an intra-group sharable resources capable of being shared by the UE group, and an inter-group sharable resources capable of being shared by the second UE outside of the UE group. The second UE may perform the CAT 1 or CAT 2 LBT procedure to contend for the inter-group sharable resources. The access to the inter-group sharable resources may be limited.