Network slice determining method and system, and apparatus

1. A network slice determining method, comprising:

obtaining, by a network selection function (NSF) node, an identity of a terminal;

sending, by the NSF node, the identity to a home subscriber server (HSS);

receiving, by the NSF node, a slice identifier of a network slice that is sent by the HSS, wherein the slice identifier is determined by the HSS based on the identity; and

determining, by the NSF node based on the slice identifier, a network slice to which the terminal belongs, wherein the determining is based at least in part on a matching of information of the terminal with network slice attribute information for the determined network slice, and wherein the NSF node stores a correspondence between slice identifiers of different network slices and different network slice attribute information, and each piece of network slice attribute information includes at least one of a terminal type, a service type, and a location range that are supported by a network slice corresponding to the network slice attribute information.

2. The method according to claim 1 , wherein the NSF node stores a correspondence between a slice identifier of a network slice and an identifier of a core network ingress node in the network slice; and

after the determining, by the NSF node based on the slice identifier, the network slice to which the terminal belongs, the method further comprises:

determining, by the NSF node based on the correspondence between a slice identifier of a network slice and an identifier of a core network ingress node in the network slice, an identifier of a core network ingress node corresponding to the slice identifier; and

sending, by the NSF node, the identifier of the core network ingress node to an access network node, wherein the identifier of the core network ingress node is used to instruct the access network node to connect the terminal to the core network ingress node corresponding to the identifier of the core network ingress node.

3. The method according to claim 1 , wherein the obtaining, by an NSF node, the identity of the terminal comprises:

receiving, by the NSF node through a uniform interface, the identity of the terminal that is sent by the access network node.

4. The method according to claim 1 , wherein the obtaining, by an NSF node, the identity of the terminal comprises:

receiving, by the NSF node, an initial attach request of the terminal that is sent by the access network node, wherein the initial attach request carries the identity of the terminal; and

performing, by the NSF node, signaling parsing on the initial attach request to obtain the identity of the terminal.

5. The method according to claim 4 , wherein the NSF node stores a correspondence between a signaling type and a parsing identifier of the signaling type; and

the performing, by the NSF node, signaling parsing on the initial attach request to obtain the identity of the terminal comprises:

determining, by the NSF node based on the correspondence between a signaling type and a parsing identifier of the signaling type, a parsing identifier corresponding to a signaling type of the initial attach request; and

performing, by the NSF node, signaling parsing on the initial attach request based on the parsing identifier to obtain the identity of the terminal.

6. The method according to claim 5 , wherein the parsing identifier is a transport layer port number of the initial attach request.

7. The method according to claim 4 , wherein before the performing, by the NSF node, signaling parsing on the initial attach request to obtain the identity of the terminal, the method further comprises:

receiving, by the NSF node, a parsing identifier that is corresponding to a signaling type of the initial attach request and that is sent by the access network node; and

the performing, by the NSF node, signaling parsing on the initial attach request to obtain the identity of the terminal comprises:

performing, by the NSF node, signaling parsing on the initial attach request based on the parsing identifier to obtain the identity of the terminal.

8. A network slice determining method comprising:

obtaining, by a network selection function (NSF) node, an identity of a terminal;

sending, by the NSF node, the identity to a home subscriber server (HSS);

receiving, by the NSF node, a slice identifier of a network slice that is sent by the HSS, wherein the slice identifier is determined by the HSS based on the identity; and

determining, by the NSF node based on the slice identifier, a network slice to which the terminal belongs,

wherein the NSF node stores a correspondence between a slice identifier of a network slice and network slice attribute information, and the network slice attribute information comprises at least one of a terminal type, a service type, or a location range that are supported by a network slice corresponding to the network slice attribute information; and

the determining, by the NSF node based on the slice identifier, the network slice to which the terminal belongs comprises:

querying, by the NSF node based on the correspondence between a slice identifier of a network slice and network slice attribute information, network slice attribute information corresponding to the slice identifier;

obtaining, by the NSF node, assistance information of the terminal, wherein the assistance information comprises at least one of a terminal type of the terminal, a service type requested by the terminal, and location information of the terminal; and

if the assistance information matches the network slice attribute information, determining, by the NSF node, a network slice indicated by the slice identifier as the network slice to which the terminal belongs.

9. A network selection function (NSF) node, comprising:

a processor, configured to: obtain an identity of a terminal, and receive a slice identifier of a network slice that is sent by a home subscriber server (HSS), wherein the slice identifier is determined by the HSS based on the identity;

a transceiver, configured to send the identity to the HSS; and

the processor, configured to determine, based on the slice identifier, a network slice to which the terminal belongs, wherein the processor to determine the network slice further comprises the processor configured to determine is based at least in part on a matching of information of the terminal with network slice attribute information for the determined network slice, and wherein the NSF node stores a correspondence between slice identifiers of different network slices and different network slice attribute information, and each piece of network slice attribute information includes at least one of a terminal type, a service type, and a location range that are supported by a network slice corresponding to the network slice attribute information.

10. The NSF node according to claim 9 , wherein

the processor is further configured to:

obtain assistance information of the terminal, wherein the assistance information comprises at least one of a terminal type of the terminal, a service type requested by the terminal, and location information of the terminal,

query, based on the correspondence between a slice identifier of a network slice and network slice attribute information, network slice attribute information corresponding to the slice identifier; and

if the assistance information matches the network slice attribute information, determine a network slice indicated by the slice identifier as the network slice to which the terminal belongs.

11. The NSF node according to claim 9 , wherein the NSF node stores a correspondence between a slice identifier of a network slice and an identifier of a core network ingress node in the network slice;

the processor is further configured to determine, based on the correspondence between a slice identifier of a network slice and an identifier of a core network ingress node in the network slice, an identifier of a core network ingress node corresponding to the slice identifier; and

the transceiver is further configured to send the identifier of the core network ingress node to an access network node, wherein the identifier of the core network ingress node is used to instruct the access network node to connect the terminal to the core network ingress node corresponding to the identifier of the core network ingress node.

12. The NSF node according to claim 9 , wherein

the processor is configured to receive, through a uniform interface, the identity of the terminal that is sent by the access network node.

13. The NSF node according to claim 9 , wherein the NSF node further comprises a parsing unit;

the processor is further configured to receive an initial attach request of the terminal that is sent by the access network node, wherein the initial attach request carries the identity of the terminal; and

the parsing unit is configured to perform signaling parsing on the initial attach request to obtain the identity of the terminal.

14. The NSF node according to claim 13 , wherein the NSF node stores a correspondence between a signaling type and a parsing identifier of the signaling type; and

the processor is configured to: determine, based on the correspondence between a signaling type and a parsing identifier of the signaling type, a parsing identifier corresponding to a signaling type of the initial attach request, and perform signaling parsing on the initial attach request based on the parsing identifier to obtain the identity of the terminal.

15. The NSF node according to claim 13 , wherein the processor is further configured to:

receive a parsing identifier that is corresponding to a signaling type of the initial attach request and that is sent by the access network node, and perform signaling parsing on the initial attach request based on the parsing identifier to obtain the identity of the terminal.