A method and an apparatus for terminating a cellular network connection of a terminal that is connected without authentication are provided. The disclosure relates to a communication technique and a system for fusing a 4th generation (4G) system and a 5th generation (5G) communication system to support higher data rates, which is subsequent to the 4G system, with Internet-of-things (IoT) technology. The disclosure may be applied to intelligent services (e.g., smart home, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail business, security and safe-related services, or the like) based on 5G communication technology and IoT-related technology.

A method and an apparatus for terminating a cellular network connection of a terminal that is connected without authentication are provided. The disclosure relates to a communication technique and a system for fusing a 4th generation (4G) system and a 5th generation (5G) communication system to support higher data rates, which is subsequent to the 4G system, with Internet-of-things (IoT) technology. The disclosure may be applied to intelligent services (e.g., smart home, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail business, security and safe-related services, or the like) based on 5G communication technology and IoT-related technology.

Apparatuses, methods, and systems are disclosed for establishing a connection with a dual registered device. One method includes receiving a first request to establish an internet protocol multimedia subsystem session with a first device, wherein the first device is dual registered to: a first network access supporting 5G core network connectivity; and a second network access supporting evolved packet core network connectivity and circuit switched network connectivity, wherein the first device has connectivity to an internet protocol multimedia subsystem via either the first network access or the second network access. The method includes determining first information corresponding to a network access connectivity selected from the first network access and the second network access through which the first device has internet protocol connectivity with the internet protocol multimedia subsystem. The method includes transmitting a second request to a first network function to retrieve second information.

A more efficient over-the-air software push can be facilitated by a firmware over-the-air (FOTA) server device in communication with a home subscriber server (HSS). For example, the FOTA server can host the names of user equipment devices that are due for a FOTA update. When a user equipment device identification is received from the HSS, the FOTA server can then check the user equipment device identification against the names within the server. If the name is found, then the system can send discontinuous reception data to the user equipment device to modify a current discontinuous reception value of the user equipment device. Thus, the modified discontinuous reception value can prompt a long reception time of the user equipment device such that the user equipment device can receive the FOTA.

A more efficient over-the-air software push can be facilitated by a firmware over-the-air (FOTA) server device in communication with a home subscriber server (HSS). For example, the FOTA server can host the names of user equipment devices that are due for a FOTA update. When a user equipment device identification is received from the HSS, the FOTA server can then check the user equipment device identification against the names within the server. If the name is found, then the system can send discontinuous reception data to the user equipment device to modify a current discontinuous reception value of the user equipment device. Thus, the modified discontinuous reception value can prompt a long reception time of the user equipment device such that the user equipment device can receive the FOTA.

A wireless User Equipment (UE) and an Access and Mobility Management Function (AMF) establish first and second active registrations and corresponding N1s. The UE and AMF deactivate the second active registration and establish a third active registration and corresponding N1. The UE and AMF exchange active N1 signaling for the first active registration and the third active registration. The UE and AMF exchange inactive N1 signaling for the second inactive registration.

A method for security handling in a mobility of a terminal device, where the method includes: a target access and mobility management function (AMF) entity receiving a first message for registering a terminal device; the target AMF entity sending a second message to a source AMF entity after receiving the first message; the source AMF entity deriving a first key based on a key between the source AMF entity and the terminal device; the source AMF entity sending the first key to the target AMF entity; the target AMF entity determining to use the first key based on security related information after receiving the first key; and the target AMF entity determining a communication key between the target AMF entity and the terminal device based on the first key after determining to use the first key.

A method for security handling in a mobility of a terminal device, where the method includes: a target access and mobility management function (AMF) entity receiving a first message for registering a terminal device; the target AMF entity sending a second message to a source AMF entity after receiving the first message; the source AMF entity deriving a first key based on a key between the source AMF entity and the terminal device; the source AMF entity sending the first key to the target AMF entity; the target AMF entity determining to use the first key based on security related information after receiving the first key; and the target AMF entity determining a communication key between the target AMF entity and the terminal device based on the first key after determining to use the first key.

A mobile communication device including a Radio Frequency (RF) device and a controller is provided. The controller activates a predetermine Application (APP), and provides a Packet-Switched (PS) data service for the predetermined APP using a first subscriber identity via the RF device. Also, the controller establishes a Radio Resource Control (RRC) connection using a second subscriber identity via the RF device to enable the mobile communication device to enter an RRC connected mode after the predetermined APP is activated, and keeps the mobile communication device in the RRC connected mode associated with the second subscriber identity while providing the PS data service for the predetermined APP using the first subscriber identity.

A wireless device receives access network information indicating an access network type. Based on the access network type, a non-access stratum (NAS) period is selected among: a first value associated with a geostationary earth orbit (GEO) non-terrestrial network (NTN) access network type; and a second value associated with a low earth orbit (LEO) NTN access network type. A NAS procedure is initiated by sending a NAS request message. A start of the NAS period is based on the sending. The NAS procedure is aborted based on an expiry of the NAS period.