Systems, methods, apparatuses, and computer program products for selective indications towards a UE (110), for example, at de-registration (110) from an AMF with request to re-register (130) with another AMF, are provided.

Apparatuses, methods, and systems are disclosed for accessing an NPN using external credentials. One apparatus in a mobile communication network includes a processor and a transceiver that receives a registration request for a UE. Here, the UE does not have a subscription with the mobile communication network. The processor identifies a service provider of the UE and controls the transceiver to send an authentication message to an AAA server of the identified service provider. The processor receives an authentication response containing a master session key from the AAA server in response to successful authentication of the UE and derives a set of security keys (e.g., K.sub.AUSF, K.sub.SEAF) using the master session key.

Apparatuses, methods, and systems are disclosed for accessing an NPN using external credentials. One apparatus in a mobile communication network includes a processor and a transceiver that receives a registration request for a UE. Here, the UE does not have a subscription with the mobile communication network. The processor identifies a service provider of the UE and controls the transceiver to send an authentication message to an AAA server of the identified service provider. The processor receives an authentication response containing a master session key from the AAA server in response to successful authentication of the UE and derives a set of security keys (e.g., K.sub.AUSF, K.sub.SEAF) using the master session key.

A method for processing a non-access stratum context is as follows: A terminal device sends a registration request message to a first public land mobile network PLMN. The terminal device receives a registration accept message from the first PLMN. When the terminal device deregisters from the first PLMN over a first access network, the terminal device stores, in a storage medium of the terminal device, a first PLMN identifier of the first PLMN and a first NAS security context established by the terminal device with the first PLMN. Embodiments of this application are used for a processing process of the non-access stratum context.

A method for processing a non-access stratum context is as follows: A terminal device sends a registration request message to a first public land mobile network PLMN. The terminal device receives a registration accept message from the first PLMN. When the terminal device deregisters from the first PLMN over a first access network, the terminal device stores, in a storage medium of the terminal device, a first PLMN identifier of the first PLMN and a first NAS security context established by the terminal device with the first PLMN. Embodiments of this application are used for a processing process of the non-access stratum context.

A method, a system, and a non-transitory storage medium are described in which an binding information service is provided. The binding information service may include applying one or multiple criteria to binding information stored by a binding service function. The binding information service may identify candidate binding information instances that may need deletion based on the one or multiple criteria. The binding information service may interrogate a policy control network device as to the current registrability of the binding information. The binding information service may delete or maintain the binding information based on a result of the interrogation. The binding information service may also include directing the binding service function to delete binding information based on one or multiple criteria. The one or multiple criteria may relate to the age of the binding information or a last time the registrability of the binding information was confirmed.

A method, a system, and a non-transitory storage medium are described in which an binding information service is provided. The binding information service may include applying one or multiple criteria to binding information stored by a binding service function. The binding information service may identify candidate binding information instances that may need deletion based on the one or multiple criteria. The binding information service may interrogate a policy control network device as to the current registrability of the binding information. The binding information service may delete or maintain the binding information based on a result of the interrogation. The binding information service may also include directing the binding service function to delete binding information based on one or multiple criteria. The one or multiple criteria may relate to the age of the binding information or a last time the registrability of the binding information was confirmed.

In processing of initializing a setting of a communication parent device, whether a communication child device has been registered is determined. In a case where the communication child device has been registered, a user is notified that the communication child device has been registered, and the user is guided to registration removal processing for the communication child device. In a case where removal of registration of the communication child device is instructed by the user's operation, registration information of the communication child device in the communication parent device is deleted.

In processing of initializing a setting of a communication parent device, whether a communication child device has been registered is determined. In a case where the communication child device has been registered, a user is notified that the communication child device has been registered, and the user is guided to registration removal processing for the communication child device. In a case where removal of registration of the communication child device is instructed by the user's operation, registration information of the communication child device in the communication parent device is deleted.

Systems, apparatuses, methods, and one or more computer-readable media storing executable instructions for registering a multi-port device are described. A computing device may receive a registration request from a user device supporting multiple ports. In response, the computing device may send to the user device a message including a plurality of telephone numbers and information of associated ports.