PUCCH Beam Failure Request Resource Allocation

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Solution Overview

Problem

In New Radio (NR) communication systems, terminals face challenges in selecting an appropriate physical uplink control channel-beam failure request (PUCCH-BFR) resource from multiple configured resources when a secondary cell experiences beam failure.

Innovation Solution

A method for allocating beam failure request resources, where a terminal detects a secondary cell with beam failure and selects a PUCCH-BFR resource based on whether the secondary cell is configured with a beam failure request resource, optimizing resource selection to reduce signaling overhead.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple PUCCH-BFR resources are configured for different serving cells, then the system can support beam failure reporting for multiple cells, but the terminal faces difficulty in selecting the appropriate resource among multiple configured resources

Engineering Contradiction:

Improvebeam failure reporting capabilityVSAvoidresource selection complexity

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The patent applies local quality by associating each PUCCH-BFR resource with a specific serving cell or cell group. When beam failure is detected on a secondary cell, the terminal selects the PUCCH-BFR resource configured for that specific cell or its parent PUCCH group, rather than choosing from all available resources globally. This localized resource association simplifies the selection process while maintaining the ability to support multiple cells.

Inventive Principle:

Principle #3Local quality

2Reliability

If PUCCH-BFR resources are configured on multiple serving cells including primary cell, then comprehensive beam failure coverage is achieved, but signaling overhead increases

Engineering Contradiction:

Improvebeam failure detection coverageVSAvoidsignaling overhead

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent segments the serving cells into different PUCCH groups, with each group having an associated PUCCH-BFR resource. Instead of configuring resources on every single cell, the system divides cells into groups (e.g., PUCCH group 1 with PCell and PUCCH group 2 with PSCell), and each group shares a common BFR resource. This segmentation reduces the total number of BFR resources needed while maintaining comprehensive coverage across all cells.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements universality by allowing a single PUCCH-BFR resource to serve multiple serving cells within a PUCCH group. The PUCCH resource configured for a PUCCH group can be used to report beam failure for any cell in that group, making the resource multi-functional. This approach reduces signaling overhead compared to having dedicated BFR resources for each individual cell.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12317104B2Method and device for allocating beam failure request resources

Publication Date: 2025.05.27 BEIJING XIAOMI MOBILE SOFTWARE CO LTD

AI summary

A method and device for allocating beam failure request resources. The method is performed by a terminal configured with multiple beam failure request resources. The multiple beam failure request resources consist of physical uplink control channel beam failure request resources configured for service cells in multiple service cell groups configured for the terminal. The method includes: detecting whether there is a first secondary cell in which a beam failure has occurred; and if so, selecting from the multiple beam failure request resources, according to whether the first secondary cell is configured with a beam failure request resource, one beam failure request resource as a resource for sending a beam failure request.