NR Sidelink Resource Selection for Low-Power Collision Avoidance
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Solution Overview
Problem
Existing 3GPP 5G NR sidelink communication technologies lack effective power-saving solutions for vulnerable road users (VRUs) and fail to minimize resource collisions between periodic and aperiodic traffic types.
Innovation Solution
Implement a method for resource selection on NR sidelink using resource selection controlling information that includes probabilities and sequences associated with traffic types, priorities, and transmission methods to determine candidate resources for PSCCH and PSSCH transmissions, incorporating partial sensing and dynamic adjustments to avoid collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resource selection is performed frequently to avoid collisions, then resource collision decreases, but power consumption increases
Solution Approach 1:
The system performs preliminary sensing in a sensing window before the resource selection window to identify resources occupied by other UEs. This advance detection allows the UE to select collision-free resources without needing frequent reselection, thereby reducing power consumption while maintaining reliable collision avoidance
Solution Approach 2:
The resource selection mechanism dynamically adjusts between different operating modes: full sensing mode for high reliability requirements, partial sensing mode for moderate requirements, and on-demand selection for power-saving scenarios. This dynamic adaptation allows the system to optimize the balance between collision avoidance and power consumption based on actual traffic conditions
2Reliability
If continuous monitoring is performed to ensure resource availability, then resource selection reliability improves, but power consumption increases
Solution Approach 1:
The UE performs sensing and resource selection periodically according to configured windows (sensing window W1 and resource selection window W2) rather than continuously. This periodic operation allows the UE to enter low-power states between monitoring intervals while still maintaining reliable resource selection through timely periodic updates
Solution Approach 2:
The system implements partial sensing where the UE monitors only a subset of resources or performs simplified sensing procedures under certain conditions, rather than exhaustive continuous monitoring. This partial action maintains sufficient reliability for most scenarios while significantly reducing power consumption compared to full continuous monitoring
3Reliability
If resource selection window is enlarged to provide more candidate resources, then resource collision decreases, but resource pool utilization efficiency worsens
Solution Approach 1:
The resource pool is segmented into multiple resource selection windows and sensing windows with different purposes. By dividing the resource pool into structured segments, the system can provide sufficient candidate resources within each segment for collision avoidance while ensuring overall efficient utilization across the entire resource pool through coordinated management
Data Source
AI summary
Embodiments of the present application relate to a method and an apparatus for resource selection on NR sidelink. According to an embodiment of the present application, a method can include: receiving resource selection controlling information; and determining one or more candidate resources in a resource selection window of a resource pool for a physical sidelink control channel (PSCCH) transmission and/or a physical sidelink shared channel (PSSCH) transmission based on the resource selection controlling information. Embodiments of the present application can save power for VRUs as well as decrease resource collision between the traffics affected by the resource selection controlling information.