Beam Failure Recovery MAC CE for SCell Status Indication

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Solution Overview

Problem

Existing technologies lack an effective method for a network device to determine the status of Secondary Cells (SCells) experiencing beam failures in a communication system.

Innovation Solution

The implementation of a Beam Failure Recovery (BFR) Media Access Control (MAC) Control Element (CE) that allows a terminal device to indicate to a network device the SCells where beam failures occur, enabling the network device to allocate corresponding uplink grant resources.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If Beam Failure Recovery is standardized only for PCell/PSCell, then the recovery mechanism is simple and reliable, but the network device cannot determine the status of SCells experiencing beam failures

Engineering Contradiction:

Improvebeam failure recovery reliabilityVSAvoidSCell beam failure status information

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The BFR MAC CE is extended to serve multiple cell types (PCell, PSCell, and SCells) simultaneously. The control element can indicate beam failure status for different cell types through dedicated fields, allowing a single mechanism to handle beam failure recovery across the entire carrier aggregation system rather than requiring separate mechanisms for each cell type.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The BFR MAC CE is divided into multiple fields, each serving a specific function: a first field indicates beam failure status for PCell/PSCell, while a second field indicates beam failure status for SCells. This segmentation allows the network device to process and interpret beam failure information for different cell types independently and accurately.

Inventive Principle:

Principle #1Segmentation

2Productivity

If the network device needs to track all SCell beam failure statuses, then accurate resource allocation is achieved, but the processing complexity increases

Engineering Contradiction:

Improveresource allocation efficiencyVSAvoidnetwork device processing complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The essential beam failure status information for SCells is extracted and encapsulated into a dedicated field within the BFR MAC CE. This allows the network device to obtain only the necessary information (SCell beam failure status) without processing the entire complex state of all cells, thereby reducing processing complexity while maintaining accurate resource allocation capability.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The terminal device performs preliminary packaging of beam failure status information for multiple SCells into a compact format within the BFR MAC CE before transmission. This preliminary organization of data reduces the processing burden on the network device, as the information is already structured and ready for direct interpretation and resource allocation.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12309659B2Indication method, terminal device, and network device

Publication Date: 2025.05.20 GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP LTD

AI summary

Disclosed are an indication method, a terminal device, a network device, a chip, a computer readable storage medium, a computer program product, and a computer program. The method includes: sending, by a terminal device, a Beam Failure Recovery (BFR) Media Access Control (MAC) Control Element (CE) to a network device. The BFR MAC CE is used to indicate at least one Secondary Cell (SCell) where a beam failure occurs.