UE Beam Failure Detection Cell Segmentation
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Solution Overview
Problem
Current wireless communication systems face challenges in managing beam failure detection (BFD) across multiple cells, as User Equipment (UE) capabilities vary, leading to excessive BFD demands that exceed processing limits, particularly when a large number of cells are activated, resulting in high power consumption and complexity.
Innovation Solution
The UE adapts the number of cells and reference signals for BFD by applying selection rules or following network guidance, using RRC, MAC, and L1 signaling to manage BFD demands, introducing a dormant cell state that allows dynamic management of cell states and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE performs BFD on a large number of activated cells, then the network coverage and reliability are improved, but the UE processing complexity and power consumption exceed capabilities
Solution Approach 1:
The patent segments the set of activated cells into two distinct groups: a first set of cells on which the UE performs BFD, and a second set of cells on which the UE does not perform BFD. This segmentation allows the UE to maintain reliable communication on critical cells while reducing processing complexity by excluding less critical cells from BFD operations, thereby resolving the contradiction between coverage reliability and UE processing capability.
Solution Approach 2:
The patent applies local quality by differentiating the BFD treatment for different cells based on their individual characteristics and importance. Instead of uniformly applying BFD to all activated cells, the UE selectively applies BFD only to cells in the first set that require it, while excluding cells in the second set. This localized approach optimizes the balance between maintaining network reliability where needed and reducing processing complexity where not required.
2Reliability
If the UE performs BFD on all activated cells, then the link reliability is improved, but the power consumption increases excessively
Solution Approach 1:
The patent segments activated cells into a first set for BFD operations and a second set excluded from BFD. This segmentation enables the UE to maintain link reliability on critical cells through targeted BFD while significantly reducing overall power consumption by avoiding unnecessary BFD operations on cells in the second set, thus resolving the contradiction between link reliability and power consumption.
Solution Approach 2:
The patent applies partial action by performing BFD only on the subset of cells (first set) that are necessary for maintaining link reliability, rather than applying it to all activated cells. This partial approach provides sufficient reliability for critical links while avoiding the excessive power consumption that would result from comprehensive BFD across all cells.
3Productivity
If the UE is configured with many SCells for network coverage, then the network capacity is improved, but the BFD management complexity increases
Solution Approach 1:
The patent segments the large number of SCells into a first set for which BFD is performed and a second set for which BFD is not performed. This segmentation enables the UE to manage network capacity effectively by applying BFD only where necessary, thereby maintaining productivity while significantly reducing BFD management complexity that would otherwise increase with the total number of configured cells.
Solution Approach 2:
The patent applies local quality to BFD management by selectively applying BFD to specific cells based on their individual requirements. This allows the UE to maintain network capacity through targeted BFD on critical cells while avoiding the excessive management complexity that would result from uniform BFD application across all SCells.
4Device complexity
If the UE adapts the number of cells for BFD based on capability, then the processing load is reduced, but the network configuration flexibility is limited
Solution Approach 1:
The patent introduces dynamic adaptability by enabling the UE to adjust the composition of the first and second sets of cells based on current network conditions and UE capability. The UE can dynamically reconfigure which cells are included in the BFD set versus the excluded set, providing flexibility in network configuration while managing processing load according to actual operational requirements rather than static capability limits.
Data Source
AI summary
An apparatus includes a processor, a memory; and communication circuitry, the apparatus being connected to a communications network via the communication circuitry, the apparatus further including computer-executable instructions stored in the memory which, when executed by the processor, causes the apparatus to identify an apparatus capability that is an indication of an ability of the apparatus to perform beam failure detection (BFD) for a plurality of cells, transmit the apparatus capability to another apparatus, receive from the other apparatus at least one message including a change in network configuration; and substitute a second set of cells for the first set of cells on which the apparatus performs BFD based on the change in network configuration so the apparatus capability is not exceeded by the network configuration.