Beam Failure Detection via gNB Feedback in NR Handover

The patent implements a feedback mechanism where the UE reports beam-related information (such as beam failure detection, beam recovery status, and beam quality metrics) back to the gNB. This feedback loop enables the gNB to detect and respond to beam failures that would otherwise be invisible to the network side, thereby resolving the contradiction between maintaining connection reliability and detecting beam failures.

The patent introduces beam-related information reporting as an intermediary mechanism between the UE and gNB. This intermediary layer translates physical layer beam conditions into higher-layer information that the gNB can process and act upon, enabling indirect detection of beam failures through the UE's observations and measurements.

The patent applies partial action by reporting beam-related information only when specific conditions are met (e.g., when beam failure is detected, when beam quality degrades below thresholds, or during specific mobility events). This selective reporting approach provides sufficient information for mobility management while avoiding excessive signaling overhead that would occur with continuous or unconditional reporting.

The patent changes the parameter of information reporting from continuous to event-triggered or conditional. By monitoring beam quality parameters and triggering reports only when significant changes occur (such as beam failure detection or recovery), the system maintains mobility management efficiency while minimizing signaling overhead.