NR Cell Connection Failure Handling for Uplink LBT Failures

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Solution Overview

Problem

In New Radio mobile communications systems, unlicensed bands are shared, leading to unreliable data transmission due to listen-before-talk failures, which current methods fail to accurately detect and handle cell connection failures, affecting data transmission reliability.

Innovation Solution

A method to detect cell connection failures by monitoring uplink transmission failures and using serving cell-related information, such as the number of cells and cell type, to trigger appropriate recovery procedures, enhancing detection accuracy and efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the terminal device continuously performs cell selection and reselection in high-speed mobile scenarios, then the terminal can maintain connection with the network, but the terminal energy consumption increases significantly

Engineering Contradiction:

Improveconnection maintenanceVSAvoidterminal energy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The network side pre-configures multiple candidate cells and their measurement parameters to the terminal before the terminal needs to perform cell selection. This allows the terminal to quickly switch between pre-evaluated cells without continuous measurement, reducing energy consumption while maintaining connection reliability in high-speed scenarios

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements dynamic adjustment of cell selection parameters based on terminal speed. When high speed is detected, the system switches to a simplified cell selection mode using pre-configured candidate cells rather than continuous measurement, adapting the cell selection process to the mobile scenario to balance connection reliability and energy consumption

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If the terminal device frequently performs cell selection and reselection procedures, then the terminal can adapt to changing network conditions, but the processing overhead and time consumption increase

Engineering Contradiction:

Improvenetwork condition adaptationVSAvoidcell selection time

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system implements feedback mechanisms where the terminal reports measurement results and speed information to the network side. Based on this feedback, the network dynamically adjusts cell selection parameters and candidate cell configurations, enabling the terminal to adapt to changing network conditions efficiently without excessive processing overhead

Inventive Principle:

Principle #23Feedback

3Measurement precision

If the network side configures detailed cell selection parameters for all possible cells, then the terminal can make accurate cell selection decisions, but the signaling overhead and system complexity increase

Engineering Contradiction:

Improvecell selection accuracyVSAvoidsystem complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

Instead of configuring all possible cells uniformly, the patent applies local quality by providing detailed measurement parameters only for candidate cells that are relevant to the terminal's current location and movement pattern. The network side dynamically determines which cells require detailed configuration based on terminal speed and position, reducing system complexity while maintaining cell selection accuracy for the most relevant cells

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The system dynamically changes cell selection parameters based on terminal speed and network conditions. In high-speed scenarios, the system simplifies parameters by using pre-configured candidate cells with basic measurement criteria. In low-speed scenarios, more detailed parameters are applied. This adaptive parameter adjustment maintains measurement precision when needed while reducing complexity in other conditions

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP3952441B1Cell connection failure processing method and terminal device

Publication Date: 2026.05.06 VIVO MOBILE COMM CO LTD

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AI summary

A method for handling cell connection failure is provided, applied to a terminal device, where the method includes: determining whether connecting to a target serving cell has failed; and performing, in a case that connecting to the target serving cell has failed, connection failure handling based on serving cell related information, where the serving cell related information includes at least one of the number of cells and a cell type.