Embodiments of the present disclosure provide methods and apparatuses for handover. A method performed by a source NG-RAN, base station in a wireless communication network, for handling handover of a User Equipment, UE, in which the method includes obtaining an indication information which indicates the IP Multimedia Subsystem, IMS, voice call initiation. The method further includes performing a handover policy to prioritize handover or redirection to an Evolved-Universal Terrestrial Radio Access Network, E-UTRAN, base station over handover to a target NG-RAN base station.

In a LTE network user devices can access voice application service via Voice over LTE (VoLTE) and Voice over WiFi (VoWiFi). To detect faults in the data link associated with an evolved packet data gateway for providing access by the user device to the LTE network from a non-trusted network which will affect VoWiFi capability, a packet data gateway monitors the status of ePDG and if a fault is detected, the user device is notified that it should connect to voice services via VoLTE.

Methods and apparatuses for redirecting a wireless transmit/receive unit (WTRU) to a dedicated core network (CN) node are described. An apparatus is configured to initiate a Service Request with a non-dedicated network node. The apparatus is configured to receive a special identifier in response to the Service Request, which indicates the apparatus should be redirected to a dedicated CN node based on subscription information. Radio access network resources associated with the apparatus may be released and the apparatus may then perform a tracking area update (TAU) request which is then forwarded to the dedicated CN node.

Methods and apparatuses for redirecting a wireless transmit/receive unit (WTRU) to a dedicated core network (CN) node are described. An apparatus is configured to initiate a Service Request with a non-dedicated network node. The apparatus is configured to receive a special identifier in response to the Service Request, which indicates the apparatus should be redirected to a dedicated CN node based on subscription information. Radio access network resources associated with the apparatus may be released and the apparatus may then perform a tracking area update (TAU) request which is then forwarded to the dedicated CN node.

Systems and methods for dynamically managing the states (e.g., enabling/disabling) of telecommunication services/features are disclosed. To do so, the system associates parameters (e.g., timers) with the impacted services/features. For example, when a user experiences issues with voice calls, he/she calls the telecommunications service provider (carrier) to help resolve the issue. A customer care representative may ask the user to temporality turn off the VoNR service to help alleviate the issue. When the user turns off (or toggles off) the VoNR service on his/her mobile device, the system can start a configurable timer (parameter) for the VoNR service. In this manner, the system can replace the conventional toggle on/off feature with a time-based feature. The system monitors the timer's value and when the timers value reaches a target value (e.g., 24 hours, 1 week, etc.), the system alerts the user that the VoNR service will be turned on (or toggled on).

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.

A method for gateway recovery processing and device, the method comprising: a first mobility management unit receiving Packet Data Network (PDN) connection signaling, and triggering a paging procedure for a terminal; in response to determining that the paging procedure fails, the first mobility management unit setting and storing flag information, wherein the flag information is used to indicate that the PDN connection signaling is in a suspended state; and in a case where the terminal moves from a coverage area of the first mobility management unit to a coverage area of a second mobility management unit, the first mobility management unit sending the flag information to the second mobility management unit, wherein the flag information is used for the second mobility management unit to trigger a Serving Gateway (SGW) to send a bearer update request message to a PDN Gateway (PGW).

A communication method, an apparatus, and a system in which a first session management function entity based on information of a terminal group determines user plane function entities accessed by terminals in a terminal group, and the first session management function entity determines a target user plane function entity based on the user plane function entities, where the target user plane function entity is used to perform communication between terminals in the terminal group. According to the method, the terminals in the terminal group are redirected to a same user plane function entity, namely, the target user plane function entity, so that communication between the terminals in the terminal group is locally implemented in the target user plane function entity. This shortens a communication path, and reduces a communication latency.

A cellular network includes a first network component configured to i) identify a first session between a first data network and a user equipment (UE), wherein the first session corresponds to a first session management function (SMF), ii) receive data network access information (DNAI) from a network function, the DNAI corresponding to a second data network and iii) select a second SMF that is to be utilized for a second session between the second data network and the UE. The cellular network also includes a second network component configured to i) store a mapping between the DNAI and the second SMF and ii) transmit an indication of the second SMF to the first network component, wherein the first network component selects the second SMF based on the indication.

This application discloses a session management method, a network device, and a communications system. According to embodiments of the present invention, an intermediate session management entity is selected based on UE location information and PDU session requirement information. In this way, an intermediate session management entity near UE can provide a service for a PDU session, and a delay of data transmission is reduced. In addition, the intermediate session management entity selects a user plane entity based on the UE location information and the PDU requirement information, and the intermediate session management entity is responsible for managing user plane entities within a specified area, and does not need to manage user plane entities in the entire PDU session, thereby reducing management complexity.