Beam Failure Recovery Gaps for Inter-Cell Mobility
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Solution Overview
Problem
In wireless communication systems, beam failure recovery (BFR) procedures for inter-cell mobility (ICM) are hindered by the UE's inability to measure candidate network entity signals due to timing delays exceeding the cyclic prefix, making it difficult to switch beams effectively.
Innovation Solution
Implementing a communication gap duration during which the UE refrains from monitoring signals from the serving network entity, allowing it to receive candidate beam detection (CBD) reference signals from a neighbor cell, facilitating beam failure recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE continuously monitors signals from the serving network entity, then signal reception reliability is maintained, but the UE cannot measure candidate beams from neighbor cells for beam failure recovery
Solution Approach 1:
The patent segments the communication timeline into two distinct phases: a first communication gap duration where the UE refrains from monitoring serving cell signals to measure candidate beams from neighbor cells, and a second communication gap duration where the UE resumes monitoring serving cell signals. This temporal segmentation allows the UE to switch between beam measurement mode and normal communication mode, resolving the contradiction between maintaining signal reception reliability and enabling beam failure recovery capability.
2Adaptability or versatility
If the UE measures candidate beams from neighbor cells, then beam failure recovery is enabled, but timing delays exceed the cyclic prefix causing measurement failures
Solution Approach 1:
The patent applies preliminary action by configuring the UE with communication gap durations before the actual beam failure recovery is needed. The first communication gap duration is configured in advance to allow the UE to measure candidate beams from neighbor cells without interference from serving cell signals. This pre-configured timing structure ensures that timing delays remain within the cyclic prefix boundary, enabling reliable beam measurement while maintaining beam failure recovery capability.
3Adaptability or versatility
If the UE updates RRC parameters for candidate network entity, then inter-cell mobility is enabled, but the delay duration is too short for the UE to receive CBD reference signals
Solution Approach 1:
The patent introduces dynamic communication gap durations that can be adjusted based on the specific timing conditions of beam failure recovery scenarios. The first communication gap duration is dynamically configured to match the timing requirements of receiving CBD reference signals from candidate network entities. This dynamic adjustment allows the UE to update RRC parameters for inter-cell mobility while ensuring sufficient time to receive necessary reference signals, resolving the contradiction between mobility capability and parameter update delay.
Data Source
AI summary
This disclosure provides systems. devices. apparatus. and methods, including computer programs encoded on storage media, for BFR techniques based on ICM. A UE (102) activates (420), based on a beam failure with a first network entity (304). a communication gap duration in which the UE (102) refrains from monitoring for signals from the first network entity (304) in at least one of a same CC. a first set of CCs of a same band. or a second set of CCs of a band combination associated with the first network entity (304). The UE (102) receives (422). during the communication gap duration. a CBD reference signal from the second network entity (404). A measurement (424) of the CBD reference signal is indicative of one or more candidate beams associated with the second network entity (404) for recovering from the beam failure with the first network entity (304).