Section: 8.13.1 Signalling based MDT activation
Content: The signalling flow for Signalling based MDT activation involving E1 and F1 is shown in Figure 8.13.1-1. Figure8.13.1-1 Signalling based MDT Activation 1. The AMF starts a trace session and sends a TRACE START message to the gNB. The AMF shall consider the MDT user consent information when activating an MDT trace session for the UE as defined in TS 32.422[ Telecommunication management; Subscriber and equipment trace; Trace control and configuration management ]  [20]. TRACE START message includes the parameters for configuring MDT measurements. 2. The gNB-CU-CP decides if the gNB-CU-UP, or the gNB-DU, or both, should be involved in the MDT measurement. If the gNB-CU-UP should be involved in the MDT measurement, the gNB-CU-CP sends TRACE START message to the gNB-CU-UP, including MDT configuration parameters. 3. If the gNB-DU should be involved in the MDT measurement, the gNB-CU-CP sends TRACE START message to the gNB-DU, including MDT configuration parameters.