Positioning SRS Configuration for RRC Inactive 5G Terminals

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Solution Overview

Problem

Existing 5G communication systems face challenges in accurately determining the positioning of terminals, particularly in RRC_INACTIVE state, due to limitations in transmitting and receiving necessary positioning signals effectively.

Innovation Solution

The method involves transmitting UECapabilityInformation, providing ProvideAssistanceData, and handling RRCRelease messages to configure SRS in RRC_INACTIVE state, including first and second information related to SRS and BWP configuration, to enhance positioning accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the terminal transmits positioning signals in RRC_INACTIVE state, then positioning accuracy is improved, but device complexity increases due to additional configuration management

Engineering Contradiction:

Improvepositioning accuracyVSAvoidconfiguration management complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The network configures SRS parameters and BWP information in advance before the terminal enters RRC_INACTIVE state. The terminal stores these pre-configured parameters and automatically applies them when needed, eliminating the need for complex real-time configuration management during inactive state positioning operations.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If multiple configuration parameters are transmitted for SRS and BWP, then positioning reliability is improved, but loss of information increases due to larger message size

Engineering Contradiction:

Improvepositioning reliabilityVSAvoidmessage truncation or omission

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The configuration information is divided into two parts: essential SRS parameters (resource allocation, frequency, time domain settings) are included in the RRCRelease message, while detailed BWP configuration parameters are referenced separately or provided on-demand. This segmentation ensures critical positioning parameters are always transmitted while avoiding message size limitations.

Inventive Principle:

Principle #1Segmentation

3Speed

If SRS transmission is configured in RRC_INACTIVE state, then positioning speed is improved, but use of energy increases due to continuous signal transmission

Engineering Contradiction:

Improvepositioning speedVSAvoidterminal energy consumption

Core Design Contradiction:

SpeedVSUse of energy by moving object

Solution Approach 1:

The SRS transmission is configured with periodic intervals rather than continuous transmission. The terminal transmits positioning signals only at scheduled time points defined by the periodicity parameter, enabling fast positioning when needed while conserving energy during extended inactive periods between positioning events.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS20250350430A1Method and apparatus for transmitting sounding reference signal for positioning in mobile wireless communication system

Publication Date: 2025.11.13 DOLBY INTERNATIONAL AB

AI summary

A method and apparatus for positioning in a mobile communication system are provided. Method for positioning includes transmitting a UECapabilityInformation, transmitting a provideCapabilities, receiving a ProvideAssistanceData, receiving a RRCRelease and transmitting a positioning SRS in RRC_INACTIVE state. The RRCRelease includes a first information and a second information, the first information is related to a configuration of SRS in RRC_INACTIVE and the second information is related to a BWP.