SCell Beam Failure Recovery Configuration via PUCCH and CFRA
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing beam failures in Secondary Cells (SCells) during Carrier Aggregation in New Radio (NR), leading to PRACH overload in Primary Cells and inefficient resource utilization.
Innovation Solution
The method involves configuring terminal devices with Beam Failure Recovery (BFR) options such as BFR with PUCCH, CFRA, CBRA, and BFR without PRACH and PUCCH, allowing network devices to transmit acknowledgments that include resource allocations and priority settings for BFR, enabling the terminal devices to perform BFR based on received configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If terminal devices perform BFR using CBRA on the PCell, then beam failure recovery can be achieved, but PRACH overload occurs in the PCell
Solution Approach 1:
The patent segments the BFR process into two parts: SCell BFR and PCell BFR. For SCell BFR, terminal devices use configured uplink resources (PUCCH or dedicated PRACH) specific to the SCell, separating SCell recovery traffic from PCell PRACH resources. This prevents SCell beam failures from overwhelming the PCell's random access channel, resolving the contradiction between maintaining recovery capability and avoiding PRACH overload.
Solution Approach 2:
The patent introduces an intermediary mechanism where the network device configures and manages dedicated uplink resources for SCell BFR. These configured resources act as intermediaries that handle SCell recovery traffic, preventing it from directly competing with PCell random access traffic on the shared PRACH resources, thus reducing PCell PRACH load while maintaining SCell recovery capability.
2Adaptability or versatility
If multiple BFR options are configured for terminal devices, then BFR flexibility and resource management improve, but device complexity increases
Solution Approach 1:
The patent implements dynamic BFR option selection where terminal devices can adaptively choose from multiple configured BFR options (PUCCH-based, CFRA-based, or CBRA-based) depending on current channel conditions and network requirements. The network device dynamically configures and activates specific BFR options through RRC signaling, allowing the system to optimize between reliability and complexity based on real-time conditions rather than using a fixed complex configuration always.
Solution Approach 2:
The patent applies different BFR configuration qualities to different cells and scenarios. Not all SCells require the same BFR complexity - the network can configure simple PUCCH-based BFR for some SCells while providing more robust CFRA options for others based on local channel conditions and service requirements. This localized differentiation reduces overall device complexity while maintaining adaptability where needed.
Data Source
AI summary
The present disclosure provides a method (100) in a network device for configuration of Beam Failure Recovery, BFR. The method (100) includes: receiving (110) from a terminal device a beam failure report associated with a Secondary Cell, SCell. The method (100) further includes: configuring (120) the terminal device with at least one of the following BFR options: BFR with Physical Uplink Control Channel, PUCCH, BFR with Contention Free Random Access, CFRA, BFR with Contention Based Random Access, CBRA, and BFR without Physical Random Access Channel, PRACH, and PUCCH.