Beam Failure Monitoring for Low-Latency Inter-Cell Mobility
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Solution Overview
Problem
Current wireless communication systems lack a solution for Layer 1/Layer 2 (L1/L2) inter-cell mobility, leading to unnecessary connectivity interruptions and increased latency during beam failure recovery (BFR) when a user equipment (UE) is configured with both a serving cell and L1/L2 inter-cell mobility candidate cells.
Innovation Solution
The UE is configured to perform beam failure detection (BFD) and BFR on both the serving cell and L1/L2 inter-cell mobility candidate cells, allowing for L1/L2 inter-cell mobility to a suitable target cell if the serving cell beams fail, thereby reducing connectivity interruptions and signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE performs BFD and BFR only on the serving cell using legacy procedures, then the procedure is simple to implement, but it causes unnecessary connectivity interruptions and increased latency when beam failure occurs
Solution Approach 1:
The network pre-configures candidate target cells and their beam failure detection configurations before beam failure occurs. When beam failure is detected on the serving cell, the UE can immediately initiate BFR on pre-configured candidate cells without waiting for network reconfiguration, thereby reducing recovery latency and avoiding unnecessary connectivity interruptions
Solution Approach 2:
The patent enables dynamic selection of target cells for BFR based on real-time beam failure detection results. The UE can switch from serving cell BFR to candidate cell BFR or L1/L2 inter-cell mobility based on which approach is more efficient, making the recovery process adaptive rather than static
2Reliability
If the UE performs BFD and BFR on both serving cell and candidate cells, then connectivity robustness is improved, but the device complexity and processing overhead increase
Solution Approach 1:
The patent segments the BFD monitoring process by introducing separate search space sets and monitoring configurations for serving cell and candidate cell BFD. This segmentation allows independent configuration and management of BFD resources for different cell types, making the complex multi-cell monitoring process more manageable and organized
Solution Approach 2:
The patent creates a universal BFD monitoring framework that can handle both serving cell and candidate cell beam failure detection using a unified configuration structure. The same BFD monitoring mechanisms, search space sets, and resource configurations can be applied across different cell types, reducing the need for separate specialized procedures for each cell type
Data Source
AI summary
In an example, a method performed by a user equipment (UE) for beam failure detection (BFD) monitoring is provided. The method comprises receiving, from a network node, a configuration identifying one or more Layer 1/Layer 2 (L1/L2) inter-cell mobility candidate target cells; and performing BFD monitoring on a current serving cell of the UE. The method also comprises determining BFD on the current serving cell, and performing BFR on a beam on the current serving cell or a beam on one of the one or more candidate target cells, or executing L1/L2 inter-cell mobility to a beam on one of the one or more candidate target cells.