UE Fast Recovery Failure Indication in Dual Connectivity

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Solution Overview

Problem

In dual-connectivity scenarios, when a user equipment (UE) detects a failure in the fast recovery of the master cell group link, the network node is not informed of this failure, leading to inefficiencies in recovery processes.

Innovation Solution

The UE sends indication information to the network node to inform it of a fast recovery failure (FRF) occurring through a secondary link after a first link failure, allowing the network node to optimize configurations and improve recovery procedures.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If the UE performs fast recovery through SCG link after MCG link failure, then the MCG link recovery speed is improved, but the network node cannot learn of the recovery failure leading to information loss

Engineering Contradiction:

ImproveMCG link recovery speedVSAvoidFast recovery failure information

Core Design Contradiction:

SpeedVSLoss of information

Solution Approach 1:

The patent implements a feedback mechanism where the UE sends indication information to the network node to report fast recovery failure. This feedback loop allows the network node to learn about recovery failures that previously went undetected, resolving the information loss problem while maintaining the fast recovery capability

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent uses indication information as an intermediary carrier to transmit fast recovery failure status from the UE to the network node. This intermediary mechanism enables the network node to obtain failure information without interfering with the fast recovery process itself

Inventive Principle:

Principle #24Intermediary (Mediator)

2Loss of information

If the UE reports fast recovery failure through indication information, then the network node can learn of the failure improving information availability, but the signaling overhead increases

Engineering Contradiction:

ImproveFast recovery failure informationVSAvoidSignaling overhead

Core Design Contradiction:

Loss of informationVSDevice complexity

Solution Approach 1:

The patent extracts only the essential fast recovery failure status information and transmits it through compact indication information. This selective extraction approach provides the necessary failure information to the network node while minimizing signaling overhead by excluding unnecessary data

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS12495460B2Information indication method, information obtaining method, terminal, and network node

Publication Date: 2025.12.09 VIVO MOBILE COMM CO LTD

AI summary

The present invention provides an information indication method, an information obtaining method, a terminal, and a network node. The information indication method includes: sending indication information to the network node, where the indication information is used to indicate that the terminal detects a fast recovery failure FRF, the FRF is a failure of a fast recovery that is of a first link and that is initiated through a second link after a first link failure, the first link is a link between the terminal and a first node, and the second link is a link between the terminal and a second node