FIELD: wireless communication.
SUBSTANCE: invention relates to a mobile communication system. User terminal comprises a control section configured to, when the resource for beam failure detection (BFD) is not configured by means of superior-level signalling, determine the reference signal (RS) indexes up to a preset number based on the transmission configuration indicator (TCI) status for the control resource set (CORESET); and a reception section configured to receive a reference signal (RS). The control section is configured to, when the quasi co-location (QCL) assumption for the control resource set #0 (CORESET#0) is changed to another quasi co-location assumption, determine the quasi co-location assumption for another control resource set based on said other quasi co-location assumption.
EFFECT: effective detection of beam failure and recovery after beam failure.
4 cl, 5 dwg
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