Listen Before Talk Failure Handling in Multi-Bandwidth Part Cells

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Solution Overview

Problem

Current radio access network (RAN) technologies face challenges in efficiently operating radio link monitoring (RLM) and listen before talk (LBT) mechanisms, particularly in multiple bandwidth parts (BWPs) and unlicensed carriers systems.

Innovation Solution

The implementation of RLM and LBT technologies within the RAN architecture, specifically designed to function effectively with multiple BWPs and unlicensed carriers, enables enhanced radio resource management and interference mitigation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If RLM and LBT mechanisms are implemented in multiple BWP systems, then radio resource management efficiency is improved, but system complexity increases

Engineering Contradiction:

Improveradio resource management efficiencyVSAvoidsystem complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent divides the bandwidth into multiple bandwidth parts (BWPs) and applies separate RLM and LBT mechanisms to each BWP. This segmentation allows independent control and monitoring of radio resources in different frequency ranges, improving management efficiency while containing complexity within each individual BWP rather than the entire system.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements dynamic switching between different BWPs and adjusts RLM/LBT parameters based on real-time radio conditions. The system can dynamically activate or deactivate LBT in specific BWPs depending on operational requirements, optimizing resource utilization while managing system complexity through adaptive control.

Inventive Principle:

Principle #15Dynamics

2Object-affected harmful factors

If LBT is applied across multiple bandwidth parts, then interference is reduced, but operational complexity increases

Engineering Contradiction:

ImproveinterferenceVSAvoidoperational complexity

Core Design Contradiction:

Object-affected harmful factorsVSEase of operation

Solution Approach 1:

By segmenting the spectrum into multiple BWPs and applying LBT independently to each, the patent reduces interference between different bandwidth regions. Each BWP can perform listen-before-talk separately, preventing collisions that would occur if a single unified LBT mechanism was applied across the entire bandwidth.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements preliminary LBT procedures before allowing transmissions in each BWP. This preliminary action ensures that the channel is clear before data transmission begins, reducing interference and improving channel access efficiency. The preliminary LBT is performed at appropriate timing within each BWP's operational cycle.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20250193924A1Listen before talk failures on a plurality of bandwidth parts of a cell

Publication Date: 2025.06.12 RESMED INC

AI summary

A wireless device receives, from a base station, configuration parameters indicating a plurality of bandwidth parts of a cell. Power measurements that indicate a listen before talk (LBT) failure on each of the plurality of bandwidth parts are performed. A radio link failure of the cell is declared in response to the power measurements indicating the LBT failure on each of the plurality of bandwidth parts.