Dynamic PRS Configuration for NR Positioning Accuracy
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Solution Overview
Problem
Current NR positioning mechanisms face inefficiencies due to static PRS configurations, leading to unnecessary resource usage, inadequate accuracy, and high latency, as well as challenges in identifying and mitigating error sources affecting positioning calculations.
Innovation Solution
Implementing dynamic PRS configurations through UE-initiated and LMF-initiated on-demand PRS transmission requests, along with dynamic changes in PRS parameters and assistance information, to optimize resource allocation and reduce latency, while also enhancing error identification and mitigation techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If static PRS configurations are used, then device complexity is reduced and ease of operation is improved, but positioning accuracy deteriorates and resource usage efficiency worsens
Solution Approach 1:
The patent implements dynamic PRS configuration where the LMF receives positioning requests from UEs and determines PRS resource allocations in real-time based on current positioning accuracy requirements. This transforms the static configuration into a dynamic system that adapts to changing positioning needs, thereby improving positioning accuracy without requiring permanently complex configuration mechanisms.
Solution Approach 2:
The system changes PRS parameters (such as resource allocation, periodicity, and configuration) based on received positioning requests and determined positioning accuracy requirements. By dynamically adjusting these parameters rather than maintaining fixed configurations, the system achieves higher positioning accuracy while managing complexity through on-demand parameter modification.
2Productivity
If static PRS configurations are used, then device complexity is reduced, but resource usage efficiency deteriorates due to unnecessary transmissions
Solution Approach 1:
The LMF autonomously determines PRS resource allocations by receiving positioning requests from UEs and independently deciding the appropriate PRS configurations. This self-service mechanism eliminates the need for manual configuration management, improves resource usage efficiency by allocating PRS only when and where needed, and manages complexity through automated decision-making algorithms.
Solution Approach 2:
Instead of continuous or static PRS transmissions, the system implements periodic PRS transmissions triggered by positioning requests. PRS resources are allocated periodically based on actual positioning needs, reducing unnecessary transmissions and improving resource efficiency while maintaining manageable configuration complexity through structured periodic allocation.
3Loss of time
If static PRS configurations are used, then ease of operation is improved, but latency increases due to inadequate accuracy and reconfiguration needs
Solution Approach 1:
The LMF receives positioning requests from UEs and determines appropriate PRS resource allocations in advance before actual positioning measurements are needed. This preliminary action ensures that PRS configurations are ready when required, reducing positioning latency without requiring complex real-time reconfiguration operations during the positioning process.
Data Source
AI summary
Radio network Positioning Reference Signals (PRSs) may be managed dynamically via user equipment (UE) requests triggered by measurements in accordance with initial PRS configurations, whereby a UE contacts an Access and Mobility Management Function (AMF) and/or a Location Management Function (LMF). Similarly, an LMF may initiate adjustments in PRS configurations and transmission via communications with base stations, UEs, and/or AMFs. Dynamic signaling of PRS configurations may be achieved via legacy protocols and/or New Radio Positioning Protocol A (NRPPa), for example. A requests from a UE for PRS configuration adjustment may include an indication of a required level of service or of a class of service, for example, and/or an indication of signal measurements, a position estimate, an indication of a capability of the UE.