gNB-DU SRS Configuration Signaling for Low-Delay UE Positioning

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Solution Overview

Problem

In a 5G communication system with CU-DU architecture, the positioning delay is increased due to the need for the gNB-CU to obtain positioning information from the gNB-DU via a UE context modification procedure, leading to additional signaling load.

Innovation Solution

The gNB-DU directly sends SRS configuration-related information to the gNB-CU, which is then forwarded to the UE, reducing the need for interaction and signaling overhead.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the gNB-CU obtains positioning information from the gNB-DU via UE context modification procedure, then the positioning information can be obtained, but the positioning delay is increased and additional signaling load is generated

Engineering Contradiction:

Improvepositioning information deliveryVSAvoidpositioning delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The gNB-DU proactively sends SRS configuration-related information to the gNB-CU before the UE context modification procedure is fully executed. This preliminary action allows the positioning information to be prepared and transmitted in advance, reducing the waiting time and signaling delay when the UE needs positioning services.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent extracts the SRS configuration-related information from the broader UE context modification procedure. By separating this specific positioning information transmission from the general context modification process, the system can deliver positioning data more efficiently without being constrained by the full procedure overhead, thereby reducing positioning delay and signaling load.

Inventive Principle:

Principle #2Taking out (Extraction)

2Reliability

If the gNB-CU obtains positioning information from the gNB-DU via UE context modification procedure, then the positioning information can be obtained, but additional signaling load is generated

Engineering Contradiction:

Improvepositioning information deliveryVSAvoidsignaling load

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts and separates the SRS configuration-related information transmission from the UE context modification procedure. This extraction allows the positioning information to be conveyed through a dedicated, simplified mechanism rather than through the complex full context modification process, thereby reducing signaling load while maintaining reliable information delivery.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent segments the positioning information transmission as a distinct function from the UE context modification procedure. By dividing the overall process into separate components (SRS configuration information transmission and other context modifications), the system can reduce the signaling overhead associated with positioning while preserving the reliability of information delivery.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS20250310924A1Positioning configuration information processing method and device

Publication Date: 2025.10.02 BEIJING XIAOMI MOBILE SOFTWARE CO LTD

AI summary

A positioning configuration information processing method performed by a gNB-Distributed Unit (DU) includes: sending Sounding Reference Signal (SRS) configuration-related information to a gNB-Central Unit (CU), wherein the SRS configuration-related information is to be sent to a User Equipment (UE) by the gNB CU and the SRS configuration-related information is used for positioning the UE.