Aperiodic UL SRS Signalling for Efficient NR Positioning

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Solution Overview

Problem

Existing LTE technologies lack defined configurations for semi-persistent and aperiodic uplink sounding reference signals (UL SRS) for NR positioning, leading to inefficiencies in resource utilization and positioning accuracy.

Innovation Solution

Implement dynamic SRS configuration methods, including aperiodic UL SRS triggering, based on positioning needs and network conditions, using Location Management Function (LMF) to determine and signal appropriate UL SRS configurations to base stations and wireless devices.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If periodic UL SRS configuration is used for positioning, then positioning capability is maintained, but resource utilization efficiency deteriorates and battery power is wasted

Engineering Contradiction:

Improvepositioning capabilityVSAvoidbattery power consumption

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent introduces semi-persistent SRS configuration that combines periodic and aperiodic characteristics. The network can configure SRS to be transmitted periodically for a defined period (semi-persistent) or trigger aperiodic transmissions on-demand based on positioning needs, optimizing the balance between maintaining positioning capability and reducing energy consumption.

Inventive Principle:

Principle #19Periodic action

2Productivity

If aperiodic UL SRS triggering is implemented, then resource wastage is reduced, but configuration complexity increases

Engineering Contradiction:

Improveresource utilization efficiencyVSAvoidconfiguration complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent implements dynamic SRS configuration where the network can switch between periodic, semi-persistent, and aperiodic transmission modes based on real-time positioning needs. The LMF can dynamically adjust the SRS configuration type and parameters, allowing the system to adapt to changing requirements and optimize resource utilization while managing complexity through standardized configuration procedures.

Inventive Principle:

Principle #15Dynamics

3Measurement precision

If LMF determines and signals UL SRS configurations, then positioning accuracy is enhanced, but signaling overhead increases

Engineering Contradiction:

Improvepositioning accuracyVSAvoidsignaling overhead

Core Design Contradiction:

Measurement precisionVSLoss of information

Solution Approach 1:

The patent utilizes parameter changes in the SRS configuration to optimize positioning accuracy. The LMF can modify parameters such as SRS transmission timing, frequency, bandwidth, and power levels based on positioning needs. By dynamically adjusting these parameters rather than using fixed configurations, the system achieves enhanced positioning accuracy while minimizing unnecessary signaling overhead through efficient parameter management.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250343653A1Signalling Support for NR Positioning with Aperiodic SRS Configurations

Publication Date: 2025.11.06 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

Embodiments described herein relate to methods and apparatus in networks, and particularly methods, Location Management Functions, base stations and wireless devices for configuring and sending uplink sounding reference signals (UL SRS). An example method performed by a Location Management Function (LMF) comprises receiving radio resource information relating to radio resources that can be applied for UL SRS by a wireless device; and providing a notification relating to triggering aperiodic uplink SRS to a base station serving the wireless device.