Sidelink PRS Resource Allocation With Sensing-Based Collision Avoidance
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Solution Overview
Problem
Existing NR V2X Scheme 2 lacks support for highly precise positioning, including resource allocations in vertical and horizontal dimensions, timing-based, angle-based, and hybrid techniques, and coverage scenarios for sidelink (SL) positioning.
Innovation Solution
Implementing mode-2 resource allocation (RA) for sidelink positioning by performing resource selection from at least one resource pool, autonomously allocating resources for SL PRS transmission, generating control information signals, and encoding reference signals for unicast, broadcast, or groupcast transmissions, with support for periodic and aperiodic resource selection and sensing-based semi-persistent scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mode-2 autonomous resource allocation is implemented for sidelink positioning, then positioning precision and support for multiple coverage scenarios are improved, but resource collision and interference increase
Solution Approach 1:
The patent applies preliminary action through sensing-based resource selection where UEs perform sensing operations before resource allocation to identify and avoid resources currently in use by other UEs. This proactive approach prevents resource collisions before they occur, allowing autonomous mode-2 allocation to achieve high positioning precision without excessive interference.
Solution Approach 2:
The patent implements feedback mechanisms where UEs monitor the sidelink channel for positioning reference signals from other UEs and adjust their own resource selections accordingly. This feedback loop enables dynamic resource adaptation that maintains positioning precision while minimizing resource collisions in autonomous mode-2 operation.
2Productivity
If sensing-based semi-persistent scheduling is used for resource allocation, then resource utilization efficiency is improved, but system complexity increases
Solution Approach 1:
The patent applies periodic action through semi-persistent scheduling where resources are allocated periodically based on sensing results. This approach improves resource utilization efficiency by reserving resources in advance for positioning transmissions, reducing the need for continuous resource selection while managing system complexity through standardized periodic patterns.
Solution Approach 2:
The patent implements dynamics by allowing UEs to transition between different resource allocation modes (persistent, semi-persistent, dynamic) based on channel conditions and positioning requirements. This dynamic adaptation improves resource utilization efficiency while managing system complexity through flexible, condition-based mode selection.
3Measurement precision
If wide bandwidth and beamforming are used for positioning signals, then positioning accuracy is improved, but device complexity and energy consumption increase
Solution Approach 1:
The patent applies local quality by directing beamforming energy specifically toward target UEs rather than omnidirectional transmission. This concentrates positioning signal energy in specific spatial directions, achieving high positioning accuracy while reducing overall device complexity and energy consumption compared to full-widthband omnidirectional signaling.
Solution Approach 2:
The patent implements segmentation by dividing the wide bandwidth into multiple smaller subbands for positioning reference signals. This allows selective activation of subbands based on positioning requirements, achieving high positioning accuracy when needed while reducing device complexity and energy consumption by activating only necessary bandwidth portions.
Data Source
AI summary
Logic may perform resource selection from a resource pool to deter-mine a set of resources from the resource pool for transmission of a reference signal. Logic may autonomously allocate the set of resources for a transmission of the reference signal within a physical sidelink shared channel (PSSCH) or as a standalone transmission. Logic may generate a control information signal to signal the set of resources for the reference signal, the control information signal comprising a source identifier field, a destination identifier field, and one or more fields to indicate automatic gain control, guard symbols, or a combination thereof. And logic may encode the control information signal for transmission to a second UE via the interface.