Dcn processing method for plmn, ue, and dcn serving node

A dedicated core network (DCN) processing method for a public land mobile network (PLMN), applied to a network sharing scenario and comprising:

• obtaining, by user equipment (UE), an identifier of an accessed PLMN, and
• determining, by the UE, that the accessed PLMN has corresponding selection assistance information of a dedicated core network DCN that serves the UE, and including, by the UE, the selection assistance information of the DCN in an access request message sent to a radio access network (RAN) node;
• or
• obtaining, by user equipment UE, an identifier of an accessed PLMN, and
• determining, by the UE, that the accessed PLMN has no corresponding selection assistance information of a DCN that serves the UE, and including, by the UE, a usage type of the UE in an access request message sent to a RAN node.

User equipment (UE), comprising:

• a receiver, configured to receive, in a shared network, an access feedback message from a network side, wherein the access feedback message comprises user location information, selection assistance information of a dedicated core network (DCN) that serves the UE, and an identifier of a public land mobile network (PLMN) that serves the UE, and the identifier of the PLMN that serves the UE is different from an identifier of a PLMN in the user location information;
• and
• a processor, configured to:
• store a correspondence between the selection assistance information of the DCN and the identifier of the PLMN that serves the UE, and store a correspondence between the selection assistance information of the DCN and the identifier of the PLMN in the user location information.

User equipment (UE), comprising:

• a receiver, configured to obtain an identifier of an accessed PLMN, and
• a processor, configured to determine that the accessed PLMN has corresponding selection assistance information of a dedicated core network (DCN) that serves the UE, so that the UE includes the selection assistance information of the DCN in an access request message sent to a radio access network (RAN) node;
• or
• a receiver, configured to obtain an identifier of an accessed PLMN, and
• a processor, further configured to determine that the accessed PLMN has no corresponding selection assistance information of a DCN that serves the UE, so that the UE includes a usage type of the UE in the access request message sent to the RAN node.