Communication method, apparatus, and chip

A communication apparatus, comprising:

• a processor coupled to a memory storing instructions and configured to execute the instructions to cause the processor to:
• determine first information after receiving a registration request from a terminal device, wherein the first information comprises network slice selection assistance information (NSSAI) requested by the terminal device, single network slice selection assistance information (S-NSSAI) in a home domain corresponding to the NSSAI requested by the terminal device, or subscribed S-NSSAI of the terminal device,
• wherein the first information also comprises location information of the terminal device and a time information of the registration request;
• and
• send the first information to a unified data management (UDM) network element, wherein via one or more transceiver circuits, the processor is configured to:
• receive steering of roaming (SoR) information of the terminal device from the UDM network element based on the first information, wherein the SoR information comprises information about one or more preferred public land mobile network (PLMN) of the terminal device;
• and
• send the SoR information to the terminal device, and when the NSSAI requested by the terminal device changes, send a change notification of the NSSAI requested by the terminal device to the UDM network element.

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

• after receiving a registration request from a terminal device, sending first information to a unified data management (UDM) network element, wherein the first information comprises network slice selection assistance information (NSSAI) requested by the terminal device, single network slice selection assistance information (S-NSSAI) in a home domain corresponding to the NSSAI requested by the terminal device, or subscribed S-NSSAI of the terminal device,
• wherein the first information also comprises location information of the terminal device and a time information of the registration request;
• receiving steering of roaming (SoR) information of the terminal device from the UDM network element based on the first information, wherein the SoR information comprises information about one or more preferred public land mobile network (PLMN) of the terminal device;
• and
• sending the SoR information to the terminal device, and when the NSSAI requested by the terminal device changes, sending a change notification of the NSSAI requested by the terminal device to the UDM network element.