UE-to-UE PRS Resource Scheduling for Sidelink Positioning
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Solution Overview
Problem
There is a need for efficient methods to configure and schedule resources for sidelink positioning reference signals (SL-PRS) in wireless communication systems, particularly for UE-to-UE positioning in various coverage scenarios, including in-coverage, partial-coverage, and out-of-coverage situations.
Innovation Solution
The method involves UE-to-UE communication for resource configuration and scheduling of direct UE-to-UE positioning reference signals (PRS), including receiving and transmitting information related to resource configurations, assistance information, and allocating resources for PRS transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If network-controlled resource allocation is used for sidelink positioning, then positioning accuracy is improved, but system complexity and latency increase
Solution Approach 1:
The patent segments the resource allocation process into two distinct modes: network-controlled mode (Mode 1) for scenarios requiring high accuracy, and autonomous UE selection mode (Mode 2) for scenarios requiring simplicity. This segmentation allows the system to choose the appropriate complexity level based on coverage conditions and positioning requirements, resolving the contradiction between accuracy and complexity.
Solution Approach 2:
The patent introduces dynamic resource allocation mechanisms where UEs can switch between network-controlled and autonomous modes based on real-time coverage conditions. The gNB can dynamically configure resource pools and allocation methods, allowing the system to adapt complexity levels to current operational requirements, thereby maintaining positioning accuracy while reducing system complexity when needed.
2Ease of operation
If autonomous resource selection by UE is used, then ease of operation is improved, but positioning accuracy deteriorates
Solution Approach 1:
The patent applies local quality by enabling UEs to autonomously select resources based on local coverage conditions and positioning needs. Each UE evaluates its own coverage status and selects appropriate resource allocation methods independently, making the system easy to operate in out-of-coverage scenarios while maintaining the capability for network-controlled high-accuracy positioning when needed.
Solution Approach 2:
The patent creates a universal resource allocation framework that supports multiple allocation methods (network-controlled and autonomous) within a single system. This multi-functionality allows the system to provide both ease of operation through autonomous selection and high accuracy through network-controlled allocation, depending on the operational context and coverage conditions.
3Adaptability or versatility
If resource configuration information is transmitted frequently, then adaptability is improved, but information loss and overhead increase
Solution Approach 1:
The patent implements periodic transmission of resource configuration information from the gNB to UEs. Instead of continuous or frequent updates, the system uses periodic signaling to convey allocation parameters, reducing information overhead while maintaining adaptability. UEs perform periodic sensing and selection based on these updated configurations, achieving a balance between adaptability and information efficiency.
Solution Approach 2:
The patent applies preliminary action by pre-configuring resource pools and allocation parameters before actual positioning operations begin. The gNB provides advance configuration information about available resources and allocation methods, allowing UEs to prepare and select appropriate resources without requiring frequent real-time information transmissions, thus reducing overhead while maintaining system adaptability.
Data Source
AI summary
A user equipment (UE) is disclosed that receives, from another UE, information related to at least one resource configuration for direct UE-to-UE positioning reference signal (PRS) transmission by the another UE. The UE selects at least one resource, for transmission of at least one direct UE-to-UE PRS, based on the information, and transmits the at least one direct UE-to-UE PRS using the at least one resource.