Abstract: This application disclose an application discovery solutions. The application discovery method is applied to a first SMF network element, and includes: obtaining a first domain name requested by a terminal device; sending the first domain name to a second SMF network element; and receiving first information from the second SMF network element, where the first information includes information about a first application platform or an IP address of a DNS server corresponding to the first application platform, the first application platform is an application platform on which a first application corresponding to the first domain name is located, and the first information is for obtaining a target IP address corresponding to the first domain name. The terminal device may access, by using the target IP address, the first application corresponding to the first domain name.

Abstract: This application discloses an application discovery method and apparatus, and a system. A session management function network element receives first information from a first network element, and determines second information based on at least the first information and location information of a terminal device. The session management function network element sends the second information to the first network element. The second information is for obtaining a first IP address corresponding to a first domain name.

Abstract: This application provides a network access method. The method includes: obtaining location information corresponding to a service subscribed to by a first terminal device; obtaining a location of the first terminal device; determining, based on the location of the first terminal device and the location information, that the first terminal device is located in an area indicated by the location information; and sending first indication information to the first terminal device, where the first indication information indicates to access a hosting network, and the hosting network is used to provide the first terminal device with a connection for obtaining the service. According to the method, when it is determined that a terminal device is located in an area indicated by location information corresponding to a service, the terminal device is indicated to access a hosting network, so that the terminal device accesses the hosting network and obtains the service.

Abstract: A domain name system query method in which: a first network element receives a DNS query request including a first domain name from a terminal apparatus; the first network element sends first request information which comprises location information of the terminal apparatus and the first domain name to a second network element; the second network element determines, based on the first request information, an IP address and feeds back the IP address to the first network element; and the first network element sends the IP address to the terminal apparatus. When a terminal apparatus performs domain name query, a core network element determines an IP address of an application server based on location information of the terminal apparatus and a queried domain name. In this way, the terminal apparatus obtains an IP address of an application server close to the terminal apparatus, thereby improving service access efficiency of the terminal apparatus.

Abstract: This application provides an information transmission method, an apparatus, and a system. The method includes: A sensing network element receives location information of a first area from a first network element. The sensing network element receives first sensing data from a first device, where a sensing area corresponding to the first sensing data includes the first area, and the first device is configured to perform sensing. The sensing network element determines first information based on the location information of the first area and the first sensing data, where the first information indicates that a first terminal device is located in the first area. The sensing network element sends the first information to the first network element. Therefore, whether a terminal device is in the first area may be determined based on sensing data. This reduces signaling overheads.

Abstract: This application provides a network verification method and apparatus. The method may include: A slice statistics network element (30) receives a slice registration request message (410) from a mobility management network element (20), where the slice registration request message (410) includes an identifier of a terminal device (10) and an identifier of a network slice. In response to the slice registration request message (410), the slice statistics network element (30) determines whether the terminal device (10) occupies a resource of the network slice. The slice statistics network element (30) determines, based on a determining result, whether to count the terminal device (10) into statistics about a terminal accessing the network slice.

Abstract: A tracking area selection method, a device, and a system are provided. The method includes: a mobility management network element initiates an authentication and authorization procedure for a network slice on which authentication and authorization are to be performed and that is in a network slice requested by a terminal; determines, based on a result of the authentication and authorization procedure, identification information of a network slice that the terminal is allowed to access; obtains, based on first information and the identification information of the network slice that the terminal is allowed to access, identification information of a target network slice and radio resource information corresponding to the target network slice; and sends the identification information of the target network slice and the radio resource information corresponding to the target network slice to an access network device.

Abstract: Embodiments of this application disclose a communication method and a communication apparatus, to identify application information of first data, and improve an application analytics success rate. The method includes: A first data analytics network element receives first information of an application from a first network element, where the first information includes first application description information and/or an application status that correspond/corresponds to the application, the first application description information includes an application identifier and first IP information that correspond to the application, and the application status includes a foreground state or a background state of the application; the first data analytics network element determines second information based on the first information; and the first data analytics network element sends the second information to a second network element.

Abstract: Embodiments of this application disclose a domain name system server determining method, and a request processing method, apparatus, and system, One example method includes: determining, by a session management function network element and based on a first location of user equipment, a data network access identifier (DNAI) indicating a deployment location of a first application; determining, by the session management function network element, an address of a first local domain name system server based on the DNAI; sending, by the session management function network element, the address of the first local domain name system server to a first device; and receiving, by the first device, the address of the first local domain name system server.

Abstract: Embodiments of this application disclose a domain name system server determining method, and a request processing method, apparatus, and system. An embodiment of this application provides a domain name system server determining method, including: A session management function network element determines an address of a first domain name system server based on a first location of user equipment, where the first domain name system server is a local domain name system server that resolves a domain name of a first application into a corresponding first Internet protocol address, which is associated with the first location; and the session management function network element sends the address of the first domain name system server to a first device.

Abstract: This application discloses a network slice admission control method. It includes a UE sends a registration request message, the registration request message carrying identification information of a network slice that the UE requests to access. When a quantity of UEs that access a network slice subject to admission control in the network slice that the UE requests to access is greater than or equal to a first threshold, the AMF sends a registration accept message that carries identification information of a first network slice that is allowed to access the first network slice. According to the method provided in this application, when the quantity of UEs that access the network slice subject to admission control in the network slice that the UE requests to access is greater than or equal to the first threshold, it can be ensured that the UE can successfully register with and access the network slice.

Abstract: A service transmission method and apparatus are provided to establish a connection between an access and mobility management function network element and a secondary base station, when a master base station is not capable of continuing to provide a service for a terminal device. In an embodiment, an access and mobility management function network element determines that a master base station is not capable of continuing to provide a service for a terminal device. The access and mobility management function network element sends a mobility management context of the terminal device to a secondary base station, where the mobility management context is used by the secondary base station to perform mobility management on the terminal device. Therefore, a signaling connection between the access and mobility management function network element and the secondary base station can be quickly established, thereby ensuring service transmission and improving user experience.

Abstract: The present disclosure relates to communication methods and communication apparatuses. In one example method, a first data analytics network element receives first information of an application from a first network element, where the first information includes at least one of first application description information or an application status that correspond/corresponds to the application. The first application description information includes an application identifier and first IP information that correspond to the application, and the application status includes a foreground state or a background state of the application. The first data analytics network element determines second information based on the first information. The first data analytics network element sends the second information to a second network element.

Abstract: Embodiments of this application provide a slice information processing method and apparatus to preferentially allocate a network slice resource to a slice for which a slice service level agreement SLA has been signed. An example solution includes: An access network device determines that a slice service level agreement (SLA) has been signed for a first slice and that no slice SLA has been signed for a second slice. The access network device prioritizes a user behavior action of the first slice, or deprioritizes a user behavior action of the second slice.

Abstract: This application provides a network slice-based communication method and an apparatus to improve a success rate of accessing a network slice by a terminal. A network device determining, by a network device, a network slice that a terminal is allowed to access and a network slice that the terminal is rejected to access; determines a registration area of the terminal based on the network slice that the terminal is allowed to access and the network slice that the terminal is rejected to access; and sends information about the registration area to the terminal.

Abstract: A domain name system query method in which: a first network element receives a DNS query request including a first domain name from a terminal apparatus; the first network element sends first request information which comprises location information of the terminal apparatus and the first domain name to a second network element; the second network element determines, based on the first request information, an IP address and feeds back the IP address to the first network element; and the first network element sends the IP address to the terminal apparatus. When a terminal apparatus performs domain name query, a core network element determines an IP address of an application server based on location information of the terminal apparatus and a queried domain name. In this way, the terminal apparatus obtains an IP address of an application server close to the terminal apparatus, thereby improving service access efficiency of the terminal apparatus.

Abstract: This application provides a network slice access control method, including: determining, by an access and mobility management function network element, first allowed network slice selection assistance information of a terminal device in a registration process to register the terminal device to a network; learning, by the access and mobility management function network element, of an authentication failure of a first network slice corresponding to first single network slice selection assistance information from the first allowed network slice selection assistance information.

Abstract: A wireless communication method includes: A mobility management network element receives a handover request from a source access network device, where the handover request includes an identifier of a first session, the first session corresponds to a first network slice, and the first session is used to transmit a data packet of a first application; when determining that a target access network device does not support the first network slice, determines a second network slice supported by the target access network device; and triggers the target access network device to transmit the data packet of the first application through the second network slice.

Abstract: A communication method includes sending, by a source mobility management network element in a first area, a first slice set for a home public land mobile network (PLMN) (HPLMN) of a terminal device to a target mobility management network element in a second area when handing over the terminal device from a source access network device in the first area to a target access network device in the second area, where the first slice set corresponds to a second slice set for the first area, and obtaining, by the target mobility management network element, a third slice set for the second area based on the first slice set.

Abstract: The present disclosure relates to slice information processing methods. One example method includes sending, by a management and control function network element, a first request to a data analytics function network element, where the first request requests first information of a slice network including at least one slice, and the first request includes identity information of the at least one slice, and receiving, by the management and control function network element, a first response from the data analytics function network element, where the first response includes the first information, and the first information is used for at least one of user control or application control of each slice of the at least one slice.