RequestComplete message on the 5G-NR radio interface and by the NGAP UEInitialMessage on the N2 interface. The mobile transmits: - the indicator S-NSSAI for the PDU session and the identity of the PDU session if it exists. If the PDU Session ID does not exist, the mobile generates a new PDU Session ID; - the SSC (Session and Service Continuity) mode of requested service, the DN (Data Network) access name and PCO (Protocol Configuration Options) configuration options to define the address of a DNS server or the IP address of a specific server (P -CSCF, for example); - the type of session establishment: either an Initial Request for the creation of a new session or a request to re-establish an existing session (Existing PDU Session). It can also be a request to establish a new session for an Emergency Request; - the capacities of the mobile 5GSM core network concerning: - the supported transport format (Ethernet), - QoS management (reflective QoS), - IPv6 multi-homing sessions, - ATSSS (Access Traffic Steering, Switching, Splitting) flow routing capabilities for multi-access connectivity services (3GPP and not 3GPP simultaneously), - the TAI location of the mobile and the type of access network. 2) The radio node transfers the NAS request to the mobile core network via the NGAP INITIAL UE MESSAGE. NG-RAN and 5G-NR The AMF function orchestrates the request from the mobile and transmits the order to the SMF function to establish the PDU session according to the QoS criteria relating to the mobile and its location. The SMF function will inject the routing table at the level of the UPF function (or UPF functions). This table contains the routing rules (tunnel, next hop) associated with the incoming packets (tunnel number and information relating to the PDU format), the QoS to apply and the data volume measurement rules. In order to establish the tunnel relative to the PDU session, it is necessary to exchange the tunnel identifier TEID and the IP address (between the radio node and the UPF) between the base station and 