4.1.5 MDT Trace selection conditions

32.4223GPPRelease 17Subscriber and equipment traceTelecommunication managementTrace control and configuration managementTS

In Immediate MDT, both in case of signalling based and management based MDT trace activation, it is always the network that evaluates all selection conditions for activating the MDT measurements and deactivating the MDT measurements (this evaluation is done continuously during the selected call session). The network activates and deactivates the MDT measurements toward the UE accordingly via RRC.

In Logged MDT and Logged MBSFN MDT, the network configures UEs for MDT tracing that are eligible based on the specified selection criteria. If area based condition is specified in the trace configuration, it is sent to the UE at configuration time and the UE will evaluate the area condition as it moves in the network in idle mode.

Immediate MDT, Logged MDT and Logged MBSFN MDT measurements shall always be configured as separate trace sessions.

In cases of overlapping MDT configuration request the signaling based request shall override the management based request. For logged MDT and Logged MBSFN MDT, prior to re configuring, the eNB shall retrieve the MDT logs from the UE.