Inter-network change method and apparatus, and related device
An inter-network change method and apparatus, where a terminal determines second network slice information to which first network slice information is mapped. The first network slice information is information about a first network slice accessed by the terminal, the second network slice information is information about a second network slice, the first network slice is a network slice in a first network, and the second network slice is a network slice in a second network. The terminal sends a request message to the second network and receives an accept message returned by the second network, such that the terminal accesses a network slice identified by network slice information accepted by the second network. It can be learned that embodiments of the present disclosure can implement a handover operation between network slices of different networks.
1. A method, comprising:
sending, to a first network, a packet data network (PDN) connection request message during a registration procedure with the first network or after completing the registration procedure, wherein the PDN connection request message requests a PDN connection in the first network, and wherein the first network is a 4th generation (4G) mobile communications system;
receiving, from the first network, a PDN connection response message, wherein the PDN connection response message comprises first network slice information identifying a first network slice in a second network, wherein the first network slice in the second network corresponds to the PDN connection in the first network, wherein the second network is a 5th generation (5G) mobile communications system, and wherein the first network and the second network have different core network devices;
sending, to the second network, a request message, wherein the request message carries the first network slice information for a terminal to register with or be handed over to the second network; and
receiving, from the second network, an accept message,
wherein the accept message carries accepted network slice information from the second network, and
wherein the accepted network slice information comprises a part or all of the first network slice information.
2. The method of claim 1 , wherein the first network slice information comprises one or more pieces of single-network slice selection assistance information (S-NSSAI).
3. The method of claim 2 , wherein the one or more pieces of S-NSSAI include a slice/service type and slice differentiation information.
4. The method of claim 1 , wherein the 4G mobile communications system comprises an Evolved Packet Core (EPC) system or an Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN).
5. The method of claim 1 , wherein the accept message further carries second network slice information that maps to the first network slice information, wherein the second network slice information is about a second third network slice, and wherein the second network slice is in the first network.
6. The method of claim 5 , wherein the request message further carries a handover indication, and wherein the handover indication instructs the second network to assign, to the terminal, a first session address that is the same as a second session address assigned by the first network to the terminal.
7. An apparatus, comprising:
one or more processors; and
a memory configured to store a program instruction executable by the one or more processors to:
send, to a first network, a packet data network (PDN) connection request message during a registration procedure with the first network or after completing the registration procedure, wherein the PDN connection request message requests a PDN connection in the first network, and wherein the first network is a 4th generation (4G) mobile communications system;
receive, from the first network, a PDN connection response message, wherein the PDN connection response message comprises first network slice information identifying a first network slice in a second network, wherein the first network slice in the second network corresponds to the PDN connection in the first network, wherein the second network is a 5th generation (5G) mobile communications system, and wherein the first network and the second network have different core network devices;
send, to the second network, a request message, wherein the request message carries the first network slice information for a terminal to register with or be handed over to the second network; and
receive, from the second network, an accept message,
wherein the accept message carries accepted network slice information from the second network, and
wherein the accepted network slice information comprises a part or all of the first network slice information.
8. The apparatus of claim 7 , wherein the first network slice information comprises one or more pieces of single-network slice selection assistance information (S-NSSAI).
9. The apparatus of claim 8 , wherein the one or more pieces of S-NSSAI include a slice/service type and slice differentiation information.
10. The apparatus of claim 7 , wherein the 4G mobile communications system comprises an Evolved Packet Core (EPC) system or an Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN).
11. The apparatus of claim 7 , wherein the accept message further carries second network slice information that maps to the first network slice information, wherein the second network slice information is about a second network slice, and wherein the second network slice is in the first network.
12. The apparatus of claim 7 , wherein the apparatus comprises the terminal or a chip.
13. A computer program product comprising computer-executable instructions stored on a non-transitory computer-readable storage medium that, when executed by one or more processors, cause an apparatus to:
receive, from a first network, a packet data network (PDN) connection response message, wherein the PDN connection response message comprises first network slice information identifying a first network slice in a second network, wherein the first network slice in the second network corresponds to a PDN connection in the first network, wherein the PDN connection is requested by a PDN connection request message, wherein the first network is a 4th generation (4G) mobile communication system, wherein the second network is a 5th generation (5G) mobile communication system, and wherein the first network and the second network have different core network devices;
send, to the second network, a request message, wherein the request message carries the first network slice information for a terminal to register with or be handed over to the second network; and
receive, from the second network, an accept message,
wherein the accept message carries accepted network slice information from the second network, and
wherein the accepted network slice information comprises a part or all of the first network slice information.
14. The computer program product of claim 13 , wherein the first network slice information comprises one or more pieces of Single-Network Slice Selection Assistance Information (S-NSSAI).
15. The computer program product of claim 14 , wherein the one or more pieces of S-NSSAI include a slice/service type and slice differentiation information.
16. The computer program product of claim 13 , wherein the 4G mobile communications system comprises an Evolved Packet Core (EPC) system or an Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN).
17. The computer program product of claim 13 , wherein the apparatus comprises the terminal or a chip.
18. An apparatus, comprising:
one or more processors; and
a memory configured to store a program instruction executable by the one or more processors to:
receive, from a first network, a packet data network (PDN) connection response message, wherein the PDN connection response message comprises first network slice information about a first network slice in a second network, wherein the first network slice corresponds to a PDN connection, wherein the PDN connection is requested by a PDN connection request message, wherein the first network is a 4th generation (4G) mobile communication system, wherein the second network is a 5th generation (5G) mobile communication system, and wherein the first network and the second network have different core network devices;
send, to the second network, a request message, wherein the request message carries the first network slice information for a terminal to register with or be handed over to the second network; and
receive, from the second network, an accept message,
wherein the accept message carries accepted network slice information from the second network, and
wherein the accepted network slice information comprises a part or all of the first network slice information.
19. The apparatus of claim 18 , wherein the first network slice information comprises one or more pieces of single-network slice selection assistance information (S-NSSAI).
20. The apparatus of claim 19 , wherein the one or more pieces of S-NSSAI include a slice/service type and slice differentiation information.