DCN processing method for PLMN, UE, and DCN serving node

1. A method for processing a dedicated core network (DCN), applied to a network sharing scenario, the method comprising:

receiving, by user equipment (UE) in a common public land mobile network (PLMN) of a shared network, an access feedback message from a network side, wherein the access feedback message comprises: user location information including an identifier of the common PLMN, 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 the identifier of the common PLMN;

storing, by the UE, a correspondence between the selection assistance information of the DCN and the identifier of the PLMN that serves the UE and a correspondence between the selection assistance information of the DCN and the identifier of the PLMN in the user location information;

obtaining, by the UE, an identifier of an accessed PLMN when the UE accesses the accessed PLMN;

in response to the accessed PLMN being the PLMN that serves the UE, determining, by the UE, that the accessed PLMN has corresponding selection assistance information of a DCN according to the correspondence between the selection assistance information of the DCN and the identifier of the PLMN that serves the UE; and

sending, by the UE, the selection assistance information of the DCN in an access request message to a radio access network (RAN) node.

2. The method according to claim 1 , wherein the selection assistance information of the DCN is a type of the DCN or a type identifier of the DCN, or information used by an operator to identify the DCN.

3. The method according to claim 1 , wherein that the identifier of the PLMN that serves the UE is different from an identifier of a PLMN in the user location information is that the identifier of the PLMN that serves the UE is not comprised in the user location information.

4. The method according to claim 1 , wherein the receiving, by the UE, the access feedback message from the network side comprises:

receiving, by the UE, a non-access stratum (NAS) accept message from a DCN serving node, wherein the NAS accept message comprises the access feedback message.

5. A method for processing a dedicated core network (DCN), applied to a network sharing scenario, the method comprising:

receiving, by a DCN serving node that serves user equipment (UE), an access request message from the UE when the UE is in a common public land mobile network (PLMN) of a shared network;

sending, by the DCN serving node, an access feedback message to the UE, wherein the access feedback message comprises: user location information including an identifier of the common PLMN, selection assistance information of a DCN that serves the UE, and an identifier of a PLMN that serves the UE, wherein the identifier of the PLMN that serves the UE is different from the identifier of the common PLMN; and

in response to the UE accessing the PLMN that serves the UE, receiving, by a radio access network (RAN) node in the PLMN that serves the UE, the selection assistance information of the DCN in an access request message from the UE.

6. The method according to claim 5 , wherein before the sending, by the DCN serving node, the access feedback message to the UE, the method further comprises:

determining, by the DCN serving node, that the UE does not support network sharing; or

determining, by the DCN serving node, that a shared radio access network RAN node broadcasts only a common PLMN; or

determining, by the DCN serving node, that the identifier of the PLMN that serves the UE is not comprised in the user location information; or

determining, by the DCN serving node, that the identifier of the PLMN that serves the UE is different from the identifier of the PLMN in the user location information.

7. The method according to claim 5 , wherein that the identifier of the PLMN that serves the UE is different from an identifier of a PLMN in the user location information is that the identifier of the PLMN that serves the UE is not comprised in the user location information.

8. An apparatus, comprising:

a memory storage comprising instructions; and

one or more processors in communication with the memory storage, wherein the one or more processors execute the instructions to:

receive an access feedback message from a network side when the apparatus in a common public land mobile network (PLMN) of a shared network, wherein the access feedback message comprises: user location information including an identifier of the common PLMN, selection assistance information of a dedicated core network (DCN) that serves the apparatus, and an identifier of a public land mobile network (PLMN) that serves the apparatus, and the identifier of the PLMN that serves the apparatus is different from the identifier of the common PLMN;

store a correspondence between the selection assistance information of the DCN and the identifier of the PLMN that serves the apparatus and a correspondence between the selection assistance information of the DCN and the identifier of the common PLMN;

obtain an identifier of an accessed PLMN when the apparatus accesses the accessed PLMN;

in response to the accessed PLMN being the PLMN that serves the apparatus, determine that the accessed PLMN has corresponding selection assistance information of a DCN according to the correspondence between the selection assistance information of the DCN and the identifier of the PLMN that serves the apparatus; and

send the selection assistance information of the DCN in an access request message to a radio access network (RAN) node.

9. The apparatus according to claim 8 , wherein the selection assistance information of the DCN is a type of the DCN or a type identifier of the DCN, or information used by an operator to identify the DCN.

10. The apparatus according to claim 8 , wherein that the identifier of the PLMN that serves the apparatus is different from an identifier of the PLMN in the user location information is that the identifier of the PLMN that serves the apparatus is not comprised in the user location information.

11. The apparatus according to claim 8 , wherein the one or more processors execute the instructions to:

receive a non-access stratum (NAS) accept message from a DCN serving node, wherein the NAS accept message comprises the access feedback message.

12. A system, comprising:

a dedicated core network (DCN) serving node comprising a transmitter and a receiver,

wherein the receiver is configured to receive an access request message from a user equipment (UE) when the UE is in a common public land mobile network (PLMN) of a shared network, and

wherein the transmitter is configured to send an access feedback message to the UE, wherein the access feedback message comprises: user location information including an identifier of the common PLMN, selection assistance information of a DCN that serves the UE, and an identifier of a PLMN that serves the UE, wherein the identifier of the PLMN that serves the UE is different from the identifier of the common PLMN; and

a radio access network (RAN) node in the PLMN that serves the UE, the RAN node comprising a receiver that is configured to receive the selection assistance information of the DCN in an access request message from the UE, when the UE accesses the PLMN that serves the UE.

13. The system according to claim 12 , wherein the DCN serving node is further configured to:

determine that the UE does not support network sharing; or

determine that a shared radio access network RAN node broadcasts only a common PLMN; or

determine that the identifier of the PLMN that serves the UE is not comprised in the user location information; or

determine that the identifier of the PLMN that serves the UE is different from the identifier of the PLMN in the user location information.