Beam Failure Recovery Signaling via PUCCH and Random Access
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Solution Overview
Problem
There is a demand for an efficient method to indicate beam failure recovery in wireless communication systems, particularly in 5G networks, to ensure seamless communication in beam-based systems.
Innovation Solution
A method and apparatus for beam failure detection and recovery in wireless communication systems, involving the transmission of a Beam Failure Recovery (BFR) Medium Access Control (MAC) Control Element (CE) via a random access procedure or uplink resource, using configuration information to detect beam failures in special cells (SpCells) and secondary cells (Scells), and including detailed information about serving cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If beam failure recovery is indicated using existing UL resources, then resource utilization is improved, but service continuity may be disrupted during beam failure
Solution Approach 1:
The patent pre-configures multiple uplink resources (dedicated PUCCH resources and random access resources) for beam failure recovery indication before beam failure occurs. When beam failure is detected, the UE can immediately use the pre-configured dedicated PUCCH resource to indicate recovery, avoiding service interruption. This preliminary preparation ensures both efficient resource utilization and continuous service.
2Reliability
If dedicated PUCCH resources are allocated for BFR indication, then service continuity is improved, but resource overhead increases
Solution Approach 1:
The patent allocates dedicated PUCCH resources specifically for beam failure recovery indication rather than using general-purpose uplink resources. This localized resource allocation ensures reliable service continuity for critical BFR indications while minimizing overall resource overhead by not dedicating general uplink resources exclusively for this purpose.
Solution Approach 2:
The system enables self-service by allowing the UE to autonomously select appropriate uplink resources (dedicated PUCCH or random access) for beam failure recovery indication based on configuration and availability. This self-service mechanism reduces network overhead by eliminating the need for centralized resource allocation decisions for each BFR event.
3Device complexity
If random access procedure is used for BFR indication, then device complexity is reduced, but indication speed decreases
Solution Approach 1:
The patent implements a dynamic resource selection mechanism where the UE can switch between dedicated PUCCH resources and random access resources for beam failure recovery indication. When dedicated resources are available, they provide fast indication; when unavailable, random access serves as a fallback. This dynamic adaptation optimizes both indication speed and resource utilization without increasing device complexity.
Data Source
AI summary
The disclosure provides a method, performed by a user equipment (UE), of performing beam failure detection and recovery, the method including: receiving, from a base station (BS), configuration information about beam failure detection and recovery; detecting a beam failure with respect to a special cell (SpCell) or a secondary cell (Scell), based on the configuration information; and transmitting, based on a result of the detecting, a beam failure recovery (BFR) medium access control (MAC) control element (CE) (BFR MAC CE) via a random access procedure or on an uplink (UL) resource or a scheduling request (SR) resource which is for transmission of the BFR MAC CE, wherein the BFR MAC CE includes information about detection or non-detection of a beam failure with respect to the SpCell.