Idle-State Terminal Positioning via RRC Release LPP Delivery

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Solution Overview

Problem

Current positioning technologies in 5G networks require terminal devices to transition to a connected state to receive LPP messages from a positioning device, leading to increased power consumption and delays, especially for devices without data services.

Innovation Solution

A method where terminal devices in a non-connected state send an RRC resume request to an access network device, which responds with an RRC release message containing an LPP message, allowing positioning without establishing a connection, using LPP PDUs and routing identifiers to ensure privacy and protocol layer isolation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If terminal device transitions to connected state to receive LPP messages, then positioning can be performed, but power consumption increases and response time delays occur

Engineering Contradiction:

Improvepositioning capabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The access network device performs preliminary action by including the LPP message in the RRC release message before the terminal device needs to use it for positioning. This allows the terminal device to receive positioning information without transitioning to connected state, thereby reducing power consumption while maintaining positioning capability.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If terminal device transitions to connected state to receive LPP messages, then positioning can be performed, but response time increases

Engineering Contradiction:

Improvepositioning capabilityVSAvoidresponse time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The access network device includes the LPP message in the RRC release message as a preliminary action, eliminating the need for terminal device to transition to connected state. This significantly reduces the time delay between positioning request and LPP message delivery, improving response time while maintaining positioning reliability.

Inventive Principle:

Principle #10Preliminary action

3Ease of operation

If RRC release message includes LPP message, then positioning information can be delivered to non-connected devices, but protocol complexity increases

Engineering Contradiction:

Improvemessage delivery capabilityVSAvoidprotocol complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The invention merges the LPP message with the RRC release message, combining two previously separate message types into a single integrated message structure. This allows positioning information to be delivered to non-connected devices without requiring separate protocol handling, simplifying the overall protocol operation while maintaining enhanced message delivery capability.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentEP4221392B1Communication methods, related apparatuses and computer-readable storage medium

Publication Date: 2025.12.10 HUAWEI TECH CO LTD

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AI summary

Embodiments of this application disclose a communication method and a related apparatus thereof, to implement positioning of a terminal device in a non-connected state. The method in embodiments of this application includes: A terminal device sends a radio resource control RRC resume request message to an access network device; and the terminal device receives an RRC release message from the access network device, where the RRC release message includes a long term evolution system positioning protocol LPP message, and the LPP message is from a positioning device.