Section: 8.13.2.5 User consent propagation in EN-DC
Content: In the EN-DC case, the EM provides the MDT configuration to both MeNB and en-gNB independently. As specified in TS 32.422[ Telecommunication management; Subscriber and equipment trace; Trace control and configuration management ]  [20] in Management based MDT getting user consent is required before activating the MDT functionality because of privacy and legal obligations. In the case of EN-DC user consent gets communicated to the MeNB at the UE context setup procedure using the INITIAL CONTEXT SETUP REQUEST message. In particular when the Management Based MDT Allowed IE is contained in the INITIAL CONTEXT SETUP REQUEST message, the MeNB stores it in the UE context and uses it, together with information in the Management Based MDT PLMN List IE, if available, to allow subsequent selection of the UE for management based MDT as specified in TS 32.422[ Telecommunication management; Subscriber and equipment trace; Trace control and configuration management ]  [20]. The MeNB may also receive user consent information in the HANDOVER REQUEST message. The MeNB will forward the MDT user consent to the SgNB at EN-DC setup. In particular, if available in the UE context, the MeNB will include the Management Based MDT Allowed IE and the Management Based MDT PLMN List IE in the SGNB ADDITION REQUEST message to the SgNB. Furthermore, the user consent will be forwarded to the relevant gNB-CU-UP at the bearer context setup or to the gNB-DU by including the Management Based MDT PLMN List IE in the BEARER CONTEXT SETUP REQUEST or UE CONTEXT SETUP REQUEST. The signalling flow for User consent proposation in EN-DC is shown in Figure 8.13.2.5-1. Figure 8.13.2.5-1 User consent propagation in EN-DC 0. User Context information are made available at the MME. 1. The MME sends INITIAL CONTEXT SETUP REQUEST message to the MeNB, including Management Based MDT Allowed IE and the Management based MDT PLMN List IE to communicate user consent to the eNB. 2. The MeNB sends SGNB ADDITION REQUEST to the gNB-CU-CP at EN-DC setup. This request includes Management Based MDT Allowed IE and, optionally, the Management based MDT PLMN List IE, if available. 3a. The user consent is communicated to the gNB-DU at the UE context setup by including the Management based MDT PLMN List IE in the UE CONTEXT SETUP REQUEST. 3b. The user consent is communicated to the gNB-CU-UP at the bearer context setup by including the Management based MDT PLMN List IE in the BEARER CONTEXT SETUP REQUEST.