22.5.1 Network-side data collection

Network-side data collection applies only to AI/ML beam management feature.

Network-side data collection for Network-side model training can be initiated by OAM or by gNB. In case of NR-DC, the data collection can only be configured for MCG. The following enablers are introduced for Network-side data collection for Network-side model over air interface:

• The UE can be configured by gNB to log L1 measurements in the AS layer memory and report them via a RRC message(s).
• Both periodic and L3 measurement event-triggered data collection are supported. The UE stores the logged data at the AS layer memory. When the AS layer memory for storing logged data becomes full, the UE stops measurement and logging for data collection. When the AS layer memory reserved for storing logged data becomes full or reaches an absolute threshold (if configured), the UE indicates data availability to the gNB, as specified in TS 38.331[12].
• When low power state is detected, the UE can indicate the low power state to the gNB. Upon reception of the low power state indication, the gNB should release the UE data collection configuration for Network-side model.

NOTE: It is up to UE implementation how to determine the AS layer memory threshold is reached and how to determine low power state.

• The gNB can indicate UE whether the logged data should be kept or not during handover. When indicated to keep the logged data, UE retains it during handover and indicates its availability after handover.