Abstract: Apparatuses, methods, and systems are disclosed for providing subscription data for an external subscriber. One apparatus includes a processor and a network interface that receives a registration request message from a remote unit and receives a subscription retrieval information. Here, the registration request message contains an external subscriber identifier and the subscription retrieval information is different than the external subscriber identifier of the remote unit. The processor controls the network interface to transmit to a network function in a mobile communication network a first request for subscription data retrieval using the subscription retrieval information and receive a response message from the network function that contains the UE subscription data. Here, the subscription retrieval information indicates that the subscription data is stored in a subscription owner outside the mobile communication network.

Abstract: Apparatuses, methods, and systems are disclosed for supporting TNGF reauthentication. One apparatus includes a network interface that communicates with a remote unit (i.e., UE) and with a mobile communication network. The apparatus includes a processor that receives a first EAP message containing a NAI from the UE. Here, the NAI indicates that the UE requests to reauthenticate with a source gateway function. The processor receives a UE context of the UE and derives a first EAP challenge packet using the UE context. Via the network interface, the processor sends the first EAP challenge packet to the UE. Here, the first EAP challenge packet is used to authenticate the target TNGF with the UE.

Abstract: Apparatuses, methods, and systems are disclosed for supporting TNGF reauthentication. One apparatus includes a processor that establishes connectivity with a first access point in a non-3GPP access network. The processor sends a first EAP message containing a NAI. If the NAI indicates a request to reauthenticate with a gateway function in the non-3GPP access network, then the processor receives a first EAP challenge packet used to authenticate the gateway function. If the NAI indicates a request to initiate a NAS signaling procedure with a mobile communication network, then the processor receives an EAP start packet. Here, the EAP start packet triggers the processor to send a first NAS message to the mobile communication network. The processor completes an EAP session initiated by one of the first EAP challenge packet and the EAP start packet.