Methods for service transmission, terminal device and AMF

1. A method for service transmission, comprising:

performing, by a terminal device, a registration and a Non Public Network (NPN) Protocol Data Unit (PDU) session establishment on an NPN;

performing, by the terminal device, a tunnel establishment with a non-3rd Generation Partnership Project Interworking Function (N3IWF) through the NPN PDU session;

transmitting, by the terminal device, first indication information to an Access and Mobility Management Function (AMF) in a Public Land Mobile Network (PLMN) via the N3IWF during a registration to the AMF through the tunnel, wherein the first indication information contains NPN identifier information as PLMN Identifier (PLMN ID)+Network Identifier (NID), indicating that the terminal device accesses the PLMN via the NPN; and

obtaining, by the terminal device from the PLMN, at least one of policy information and a Quality of Service (Qos) parameter, which is delivered by the PLMN based on the first indication information indicating that the terminal device accesses the PLMN via the NPN,

wherein the method further comprises:

transmitting, by the terminal device via a PLMN PDU session, service data of a service unsupportable by the NPN, based on the at least one of the policy information and the Quality of Service (Qos) parameter,

obtaining, by the terminal device from the NPN, at least one of additional policy information and an additional QoS parameter, and

transmitting, by the terminal device via an NPN PDU session, service data of a service supportable by the NPN, based on the at least one of the additional policy information and the additional QoS parameter.

2. The method according to claim 1 , wherein the policy information comprises at least one of a User equipment Route Selection Policy (URSP) rule, and a Quality of Service (Qos) rule.

3. The method according to claim 1 , wherein

said obtaining, by the terminal device from the PLMN, the at least one of the policy information and the QoS parameter comprises: obtaining the at least one of the policy information and the Qos parameter from a control plane network element of the PLMN, and

the at least one of the policy information and the QoS parameter is delivered by the control plane network element of the PLMN based on the first indication information.

4. The method according to claim 3 , wherein the control plane network element of the PLMN is a PLMN Policy Control Function (PCF) network element or a PLMN Unified Data Management (UDM) network element.

5. The method according to claim 1 , wherein

the first indication information is transmitted by the AMF to a UDM of the PLMN, and user subscription information is obtained based on the first indication information.

6. The method according to claim 1 , wherein

the first indication information is transmitted by the AMF to a PCF of the PLMN, and the at least one of the policy information and the QoS parameter is obtained based on the first indication information.

7. An Access and Mobility Management Function (AMF) device, comprising a processor, and a memory for storing a computer program, wherein the processor is configured to invoke and run the computer program stored in the memory to perform operations comprising:

receiving, by the AMF in a Public Land Mobile Network (PLMN), first indication information from a terminal device via a non-3rd Generation Partnership Project Interworking Function (N3IWF) during a registration of the terminal device to the AMF through a tunnel, wherein the first indication information contains Non Public Network (NPN) identifier information as PLMN Identifier (PLMN ID)+Network Identifier (NID), indicating that the terminal device accesses the PLMN via an NPN,

wherein the tunnel is established between the terminal device and the N3IWF through an NPN Protocol Data Unit (PDU) session,

the NPN PDU session is established through a registration and an NPN PDU session establishment by the terminal device on an NPN, and

at least one of policy information and a Quality of Service (Qos) parameter is delivered by the PLMN to the terminal device based on the first indication information indicating that the terminal device accesses the PLMN via the NPN,

wherein service data of a service unsupportable by the NPN is transmitted by the terminal device via a PLMN PDU session, based on the at least one of the policy information and the Quality of Service (Qos) parameter,

at least one of additional policy information and an additional QoS parameter is obtained by the terminal device from the NPN, and

service data of a service supportable by the NPN is transmitted by the terminal device via an NPN PDU session, based on the at least one of the additional policy information and the additional QoS parameter.

8. The AMF device according to claim 7 , wherein the policy information comprises at least one of a User equipment Route Selection Policy (URSP) rule, and a Quality of Service (Qos) rule.

9. The AMF device according to claim 7 , wherein the operations further comprise:

transmitting, by the AMF, the first indication information to a Unified Data Management (UDM) of the PLMN, wherein user subscription information is obtained based on the first indication information.

10. The AMF device according to claim 7 , wherein the operations further comprise

transmitting, by the AMF, the first indication information to a Policy Control Function (PCF) of the PLMN, wherein the at least one of the policy information and the QoS parameter is obtained based on the first indication information.

11. A terminal device, comprising a processor, and a memory for storing a computer program, wherein the processor is configured to invoke and run the computer program stored in the memory to perform operations comprising:

performing a registration and a Non Public Network (NPN) Protocol Data Unit (PDU) session establishment on an NPN;

performing a tunnel establishment with a non-3rd Generation Partnership Project Interworking Function (N3IWF) through the NPN PDU session;

transmitting first indication information to an Access and Mobility Management Function (AMF) in a Public Land Mobile Network (PLMN) via the N3IWF during a registration to the AMF through the tunnel, wherein the first indication information contains NPN identifier information as PLMN Identifier (PLMN ID)+Network Identifier (NID), indicating that the terminal device accesses the PLMN via the NPN; and

obtaining, from the PLMN, at least one of policy information and a Quality of Service (Qos) parameter, which is delivered by the PLMN based on the first indication information,

wherein the operations further comprise:

transmitting, via a PLMN PDU session, service data of a service unsupportable by the NPN, based on the at least one of the policy information and the Quality of Service (Qos) parameter,

obtaining, from the NPN, at least one of additional policy information and an additional Qos parameter, and

transmitting, via an NPN PDU session, service data of a service supportable by the NPN, based on the at least one of the additional policy information and the additional QoS parameter.

12. The terminal device according to claim 11 , wherein the policy information comprises at least one of a User equipment Route Selection Policy (URSP) rule, and a Quality of Service (Qos) rule.

13. The terminal device according to claim 11 , wherein

said obtaining, from the PLMN, the at least one of the policy information and the QoS parameter comprises: obtaining the at least one of the policy information and the QoS parameter from a control plane network element of the PLMN, and

the at least one of the policy information and the QoS parameter is delivered by the control plane network element of the PLMN based on the first indication information.

14. The terminal device according to claim 13 , wherein the control plane network element of the PLMN is a PLMN Policy Control Function (PCF) network element or a PLMN Unified Data Management (UDM) network element.

15. The terminal device according to claim 11 , wherein

the first indication information is transmitted by the AMF to a UDM of the PLMN, and user subscription information is obtained based on the first indication information.

16. The terminal device according to claim 11 , wherein

the first indication information is transmitted by the AMF to a PCF of the PLMN, and the at least one of the policy information and the QoS parameter is obtained based on the first indication information.