SCell Beam Failure Reporting Through a Target Cell

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

The existing NR system lacks a comprehensive beam failure detection and recovery mechanism for secondary cells (SCells) across various scenarios, particularly in carrier aggregation, leading to inefficiencies in beam failure reporting and recovery.

Innovation Solution

A method is introduced where a terminal detects beam failure on a Secondary Cell (SCell) and sends a beam failure recovery message to a base station through a target cell, enabling beam failure detection and recovery regardless of the SCell's uplink transmission capability, using methods such as PRACH, PUCCH, configured grant-based PUSCH, or SRS.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If beam failure recovery mechanism is implemented only on PCell, then the mechanism is simple to implement, but it cannot handle beam failure on SCell in carrier aggregation scenarios

Engineering Contradiction:

Improvebeam failure recovery capabilityVSAvoidsystem complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent extends the beam failure recovery mechanism from PCell-only to both PCell and SCell, making the system universal across different cell types. The terminal detects beam failure on any cell (PCell or SCell) and reports it through the available uplink resource of the target cell, enabling the mechanism to handle beam failure scenarios in carrier aggregation where SCells are configured.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If beam failure reporting is enabled on all SCells, then comprehensive coverage is achieved, but resource waste and time delay may occur

Engineering Contradiction:

Improvebeam failure detection reliabilityVSAvoidresource waste

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent configures beam failure detection and reporting mechanisms in advance for SCells before actual beam failure occurs. The terminal is pre-configured with the capability to detect and report beam failure on SCells, and the base station is pre-configured with the capability to receive and process such reports, ensuring rapid response when beam failure actually occurs without wasting resources on unnecessary detection mechanisms.

Inventive Principle:

Principle #10Preliminary action

3Speed

If fast beam failure recovery is implemented, then time delay is reduced, but the complexity of the detection and recovery process increases

Engineering Contradiction:

Improvebeam failure recovery speedVSAvoiddetection and recovery process complexity

Core Design Contradiction:

SpeedVSDevice complexity

Solution Approach 1:

The patent extracts the beam failure detection and reporting function from the main communication process and implements it as a separate, dedicated mechanism. The terminal independently detects beam failure on SCell and reports it through the target cell's uplink resource without interfering with normal communication, and the base station processes this separate report to initiate recovery, thereby achieving fast response while maintaining process clarity.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS12609751B2Method of reporting beam failure, base station and terminal

Publication Date: 2026.04.21 DATANG MOBILE COMM EQUIP CO LTD

AI summary

A method of reporting beam failure, a base station, and a terminal are provided. The method includes: in a case that a beam failure of a Secondary Cell (Scell) is detected, sending, through a target cell, a beam failure recovery message of the Scell to a base station.