PRS Configuration Adaptation for RedCap Positioning Accuracy

Solution Overview

Problem

The existing PRS configuration in the interface between a Location Management Function (LMF) and a Next-Generation Radio Access Network (NG-RAN) node is not sufficient for RedCap UEs, as they require a longer resource repetition factor for PRS transmission to support PRS frequency hopping.

Innovation Solution

A method is introduced where a first network node receives a configuration request message for on-demand PRS configuration from a second network node, including an extended PRS repetition factor value for a transmission and reception point (TRP). The first network node then transmits a response message indicating that the on-demand PRS configuration is configured or updated with the extended TRP information.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the existing PRS configuration is used for normal NR UEs, then the configuration is sufficient for normal UEs, but it is not sufficient for RedCap UEs which require longer resource repetition factor

Engineering Contradiction:

ImprovePRS configuration adaptabilityVSAvoidpositioning accuracy for RedCap UEs

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent extends the PRS repetition factor parameter range from the existing values to include extended values (e.g., rf64, rf128). This parameter extension allows RedCap UEs to use longer repetition factors which are necessary for supporting PRS frequency hopping and achieving accurate positioning, while normal UEs can continue to use the original parameter range.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces dynamic configuration mechanisms where the network can adaptively select between normal and extended PRS repetition factor ranges based on UE type (normal NR UE vs. RedCap UE). This dynamic adaptation ensures that each UE type receives the appropriate configuration for its specific requirements, resolving the contradiction between existing configuration sufficiency and new UE type requirements.

Inventive Principle:

Principle #15Dynamics

2Measurement precision

If the PRS configuration is extended to support RedCap UEs with longer repetition factors, then positioning accuracy for RedCap UEs is improved, but the complexity of the PRS configuration increases

Engineering Contradiction:

Improvepositioning accuracyVSAvoidPRS configuration complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent extends the PRS repetition factor parameter range from the existing values to include extended values (e.g., rf64, rf128). This parameter extension allows RedCap UEs to use longer repetition factors which are necessary for supporting PRS frequency hopping and achieving accurate positioning, while normal UEs can continue to use the original parameter range.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The extended PRS configuration mechanism serves multiple functions: it maintains compatibility with existing normal NR UEs while simultaneously supporting RedCap UEs with extended repetition factor requirements. The configuration system becomes universal, handling both UE types through a unified framework that automatically selects appropriate parameter ranges.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Measurement precision

If PRS frequency hopping is supported for RedCap UEs, then positioning accuracy is improved, but the resource repetition factor becomes insufficient with existing configurations

Engineering Contradiction:

Improvepositioning accuracyVSAvoidresource repetition factor duration

Core Design Contradiction:

Measurement precisionVSDuration of action of moving object

Solution Approach 1:

The patent extends the PRS repetition factor parameter range from the existing values to include extended values (e.g., rf64, rf128). This parameter extension allows RedCap UEs to use longer repetition factors which are necessary for supporting PRS frequency hopping and achieving accurate positioning, while normal UEs can continue to use the original parameter range.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250150228A1Positioning reference signal configuration enhancement

Publication Date: 2025.05.08 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A method performed by a first network node. The method includes, receiving, from a second network node, a configuration request message for on-demand positioning reference signal (PRS) configuration with at least a first transmission and reception point (TRP) associated with the first network node, wherein the configuration request message comprises an extended PRS repetition factor value for the first TRP. The method also includes, after receiving the request message, transmitting to the second network node a response message responsive to the request message, indicating that on-demand PRS configuration is configured or updated with at least the first TRP