Beam Failure Recovery Sharing Factor K for Secondary Cells
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Solution Overview
Problem
Current beam failure recovery procedures in wireless communication networks, particularly in secondary cells, are complex and inefficient, as they require UE to perform BFR on multiple serving cells for each frequency band, which compromises UE performance.
Innovation Solution
Introducing a sharing factor K to adjust the evaluation period for beam failure detection and recovery in secondary cells, allowing UE to perform BFR procedures on one serving cell for one frequency band across FR1 and FR2, with the evaluation period for secondary cells being a multiple of the primary cell's evaluation period, thereby reducing UE complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UE performs beam failure recovery on multiple serving cells for each frequency band, then beam failure detection coverage is improved, but UE complexity increases
Solution Approach 1:
The patent segments the beam failure recovery process by introducing a sharing factor K that divides the evaluation period into K times the primary cell's evaluation period. This allows secondary cells to share the recovery procedure with the primary cell, reducing the number of independent recovery processes the UE must manage while maintaining coverage across multiple frequency bands.
Solution Approach 2:
The patent makes the beam failure recovery procedure universal across primary and secondary cells by using a unified sharing factor K that applies to all secondary cells. The same evaluation period multiplication rule (T_secondary = K × T_primary) is applied universally, allowing the UE to handle multiple frequency bands with a single standardized approach rather than separate procedures for each cell.
2Reliability
If evaluation period for secondary cells is extended by sharing factor K, then UE performance is maintained, but beam failure detection speed decreases
Solution Approach 1:
The patent changes the time parameter by introducing a scalable evaluation period T_secondary = K × T_primary, where K is the sharing factor. This parameter adjustment allows the system to balance between detection speed and UE performance by extending the evaluation period proportionally to the number of secondary cells, rather than using a fixed extended period.
Solution Approach 2:
The patent implements periodic beam failure detection with the extended evaluation period T_secondary that occurs K times longer than the primary cell's period. This periodic action with adjusted timing allows the UE to maintain performance across multiple frequency bands while systematically cycling through evaluation periods rather than continuously monitoring all cells at maximum speed.
Data Source
AI summary
A method of performing beam failure recovery (BFR) procedure in primary cell and secondary cells with reduced UE complexity is proposed. A UE is configured to operate in one or multiple frequency bands under carrier aggregation or dual connectivity. The UE performs beam failure recovery (BFR) procedure on one serving cell for one frequency band across FR1 and FR2. The serving cell is an active serving cell including both primary cell (PCell) and secondary cells (SCells). Specifically, for SCell BFR procedure, a sharing factor K is introduced when multiple SCells are configured to perform BFR procedure. In one embodiment, the SCell BFR evaluation period equals to a predefined PCell BFR evaluation period times the sharing factor K.