Sidelink Resource Prioritization for Gap-Free Unlicensed Spectrum Access
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Solution Overview
Problem
Existing sidelink communication techniques in unlicensed radio frequency spectrum bands face issues with transmission gaps leading to increased latency and overhead due to channel access delays, which degrade system performance and reliability.
Innovation Solution
User equipment prioritizes resource selection based on availability and time domain location, avoiding slots already reserved by other devices to reduce transmission gaps and maintain channel access, using techniques like listen-before-talk and autonomous scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If resources are selected randomly from available resources in unlicensed spectrum, then resource selection simplicity is maintained, but transmission gaps occur causing channel access delays and increased latency
Solution Approach 1:
The patent changes the selection parameters by introducing priority levels based on time domain location and reservation status. Resources are categorized into different priority levels (e.g., higher priority for resources in unreserved slots, lower priority for resources in reserved slots), transforming the random selection process into a priority-based selection process that reduces transmission gaps while maintaining operational simplicity
Solution Approach 2:
The patent performs preliminary classification of resources into priority levels before selection. By pre-identifying which resources are in reserved versus unreserved slots and assigning priority levels accordingly, the system prepares the resource pool in advance to avoid transmission gaps, rather than reacting to gaps after they occur
2Reliability
If channel access procedure with random back-off is performed to re-gain channel access after transmission gap, then channel access reliability is improved, but overhead and delay increase
Solution Approach 1:
The patent applies preliminary anti-action by proactively selecting resources that are less likely to cause transmission gaps (resources in unreserved slots with higher priority). This preventive approach counteracts the potential need for channel access procedures by ensuring continuous transmission opportunities are selected in advance, avoiding the harmful effect of transmission gaps before they can occur
3Productivity
If resources in reserved slots are selected, then resource utilization is improved, but transmission gaps increase causing channel occupancy loss
Solution Approach 1:
The patent applies local quality by differentiating resource selection based on local characteristics of each resource (whether it's in a reserved or unreserved slot). Instead of uniform selection, the system assigns different priority levels to resources based on their local reservation status, time domain location, and other specific characteristics, allowing optimized selection that balances utilization and occupancy maintenance
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may determine resource selection priority levels associated with available resources for sidelink signaling in an unlicensed radio frequency spectrum band, the resources selection priority levels may be determined based on resource reservation information of the available resources, a time domain location of the available resources, or both. For example, a first resource of the available resources may be associated with a higher priority than a second resource of the available resources in resource selection. The UE may select one or more resources for the sidelink signaling from the available resources based on the resource selection priority levels associated with the available resources. The UE may transmit the sidelink signaling on the unlicensed radio frequency spectrum band using the one or more selected resources.