Uplink LBT Failure Reporting for NR-U Secondary Cells

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Solution Overview

Problem

In NR-U systems, consistent uplink LBT failures on secondary cells can lead to radio link failures and affect communication processes, as existing solutions do not efficiently manage and report these failures.

Innovation Solution

A method where a user terminal reports a first message through a first uplink resource to indicate M consistent uplink LBT failures on M secondary cells, where the trigger moments of these failures are earlier than the transmission moment, and the cells belong to the same cell group.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If LBT failure events are triggered on secondary cells, then channel access control is achieved, but radio link failure occurs affecting communication process

Engineering Contradiction:

Improvecommunication process stabilityVSAvoidradio link failure

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent implements a feedback mechanism where the terminal device reports LBT failure information to the network device through uplink resources. The network device receives this feedback and can adjust channel access parameters accordingly, preventing radio link failure by responding to the reported LBT failures on secondary cells.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent enables preliminary reporting of LBT failure events before they escalate to radio link failure. By reporting M consistent UL LBT failures on SCells through the first UL resource, the system takes preliminary action to prevent the harmful effect of radio link failure from occurring.

Inventive Principle:

Principle #10Preliminary action

2Loss of information

If multiple LBT failure events are reported individually, then detailed failure information is provided, but signaling overhead increases

Engineering Contradiction:

Improvefailure information completenessVSAvoidsignaling overhead

Core Design Contradiction:

Loss of informationVSQuantity of substance

Solution Approach 1:

The patent merges multiple LBT failure reports into a single first message that indicates M consistent UL LBT failures on M SCells. This combining approach provides complete failure information for multiple cells while reducing signaling overhead by transmitting all failure information in one uplink resource instead of multiple separate reports.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The first UL resource is designed to serve multiple functions: it can carry both regular uplink data and LBT failure reports. The first message structure is universal, capable of indicating LBT failures across multiple secondary cells simultaneously, making the reporting mechanism efficient and multi-functional.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS20250159680A1Methods for information transmission

Publication Date: 2025.05.15 GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP LTD

AI summary

Methods for information transmission are provided in implementations of the disclosure. The method includes reporting a first message through a first uplink (UL) resource, where the first message is used for indicating that M consistent UL listen before talk (LBT) failure are triggered on M secondary cells (SCells), a trigger moment of each of the M consistent UL LBT failure is earlier than a transmission moment corresponding to the first UL resource, the M SCells belong to a same cell group (CG), and M is a positive integer greater than or equal to 1.