Dynamic PRS Resource Configuration for UE Positioning
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Solution Overview
Problem
In R16, even if there is no positioning service or there is DL-PRS that is not used by the UE, each TRP in the base station still transmits all DL-PRS signals pre-configured by itself, leading to waste of positioning reference signal (PRS) resources and insufficient positioning accuracy for the UE.
Innovation Solution
A method and device for determining PRS configuration information, allowing for flexible and dynamic configuration of DL-PRS resources based on UE requirements, improving network efficiency, and ensuring positioning accuracy. This involves the UE obtaining a list of available PRS configuration information and transmitting a PRS resource configuration request to the LMF.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If each TRP transmits all pre-configured DL-PRS signals regardless of UE requirements, then the base station maintains simple configuration management, but PRS resources are wasted and positioning accuracy is insufficient
Solution Approach 1:
The base station pre-configures multiple DL-PRS resources with different parameters (frequency offsets, time offsets, resource element patterns) before UE positioning requests. When a UE requires positioning, the LMF selects appropriate pre-configured resources based on UE capabilities and positioning requirements, avoiding real-time configuration complexity while preventing resource waste through targeted selection.
Solution Approach 2:
The system transitions from static transmission of all pre-configured DL-PRS signals to dynamic selection based on UE requirements. The LMF determines which specific DL-PRS resources to allocate to each UE based on positioning accuracy needs, UE mobility, and channel conditions, optimizing resource usage while maintaining configuration simplicity through standardized selection criteria.
2Measurement precision
If the base station configures DL-PRS resources without considering UE requirements, then the configuration process is simplified, but positioning accuracy becomes insufficient
Solution Approach 1:
Different DL-PRS resource configurations are tailored to specific UE requirements and positioning scenarios. The LMF selects DL-PRS resources with appropriate parameters (frequency offsets, time offsets, resource element patterns) based on individual UE capabilities, mobility characteristics, and positioning accuracy requirements, ensuring optimal positioning performance for each UE without complicating the overall configuration process.
Solution Approach 2:
The system employs multiple DL-PRS resource configurations with varying parameters (frequency offsets, time offsets, resource element patterns, bandwidth parts). The LMF changes these parameters based on UE requirements, selecting configurations that optimize positioning accuracy for different scenarios such as high mobility, low mobility, different frequency ranges, and various positioning precision needs.
3Productivity
If all DL-PRS signals are transmitted continuously, then the system maintains simple transmission logic, but network efficiency decreases due to resource waste
Solution Approach 1:
Instead of transmitting all pre-configured DL-PRS signals continuously, the system extracts and transmits only the specific DL-PRS resources required by each UE for positioning. The LMF identifies and selects the necessary DL-PRS resources based on UE positioning requirements, extracting only the relevant signals from the pool of pre-configured resources, thereby reducing waste while maintaining simple transmission logic through standardized resource allocation.
Data Source
AI summary
Disclosed are a PRS resource determination method and apparatus, which are used for realizing flexible and dynamic configuration of a DL-PRS according to UE requirements, improving the network efficiency, and ensuring the positioning precision. The method for determining a PRS resource includes: obtaining a list of available PRS configuration information pre-configured by a LMF; and transmitting a PRS resource configuration request to the LMF based on the list of available PRS configuration information pre-configured by the LMF.