Access method, network device, terminal device, and amf device

A network device, wherein the network device comprises:

• an interface;
• a processor;
• and
• a non-transitory computer-readable storage medium storing a program to be executed by the processor, the program including instructions to:
• obtain first information, wherein the first information is used to indicate a slice/service type (SST) of a slice that is allowed to be accessed by a terminal device and a radio access technology (RAT) type that is allowed to be used when the terminal device accesses the slice that is allowed to be accessed;
• obtain second information, wherein the second information is used to indicate an SST of a slice connected to an access and mobility management function (AMF) device and a RAT type supported by the slice connected to the AMF device;
• and
• select, based on the first information and the second information, a first AMF device that serves the terminal device.

A non-transitory computer-readable medium for storing instructions, which when executed by a processor, cause the processor to perform a method, the method comprising:

• obtaining, by a network device, first information, wherein the first information is used to indicate a slice/service type (SST) of a slice that is allowed to be accessed by a terminal device, and a radio access technology (RAT) type that is allowed to be used when the terminal device accesses the slice that is allowed to be accessed;
• obtaining, by the network device, second information, wherein the second information is used to indicate an SST of a slice connected to an access and mobility management function (AMF) device, and a RAT type supported by the slice connected to the AMF device;
• and
• selecting, by the network device based on the first information and the second information, a first AMF device that serves the terminal device.