Method and apparatus for establishing guaranteed bit rate (GBR) quality of service (QoS) flow in session

1. A method for establishing a guaranteed bit rate (GBR) quality of service (QoS) flow in a session when dynamic policy and charging control (PCC) is not deployed, wherein the method comprises:

sending, by an access and mobility management function (AMF), first information comprising establishment request information of a protocol data unit (PDU) session from a terminal device;

receiving, by a session management function (SMF), the first information from the AMF;

obtaining, by the SMF, PDU session management subscription information from a unified data management (UDM) module; and

establishing, by the SMF, a default GBR QoS flow in the PDU session based on the first information and at least one of the PDU session management subscription information or local PDU session policy information of the SMF.

2. The method of claim 1 , wherein the first information comprises second information, wherein the second information comprises at least one of a subscription permanent identifier (SUPI), a data network name (DNN), single network slice selection assistance information (S-NASSI), service indication information, a default GBR QoS flow indication, QoS index information, or QoS parameter information.

3. The method of claim 2 , wherein obtaining the PDU session management subscription information from the UDM comprises:

sending, by the SMF to the UDM, a subscription information request message carrying the second information; and

receiving, by the SMF, the PDU session management subscription information from the UDM, wherein the PDU session management subscription information comprises subscription information of the default GBR QoS flow, and wherein the subscription information comprises a fifth generation (5G) QoS identifier (5QI), an allocation and retention priority (ARP), a guaranteed flow bit rate (GFBR), and a maximum flow bit rate (MFBR).

4. The method of claim 1 , further comprising rejecting, by the SMF, a request for establishing a non-GBR QoS flow in the PDU session.

5. The method of claim 1 , wherein the default GBR QoS flow comprises a time-sensitive GBR QoS flow.

6. A communications system for establishing a guaranteed bit rate (GBR) quality of service (QoS) flow in a session, comprising:

an access and mobility management function (AMF) configured to send first information comprising establishment request information of a protocol data unit (PDU) session from a terminal device; and

a session management function (SMF) coupled to the AMF and configured to:

receive the first information from the AMF;

obtain PDU session management subscription information from a unified data management (UDM) module; and

establish, based on the first information and at least one of the PDU session management subscription information or local PDU session policy information of the SMF, a default GBR QoS flow in the PDU session when dynamic policy and charging control (PCC) is not deployed.

7. The communications system of claim 6 , wherein the first information comprises second information, wherein the second information is at least one of a subscription permanent identifier (SUPI), a data network name (DNN), single network slice selection assistance information (S-NASSI), service indication information, a default GBR QoS flow indication, QoS index information, or QoS parameter information.

8. The communications system of claim 7 , wherein the SMF is further configured to:

send a subscription information request message to the UDM carrying the second information; and

receive the PDU session management subscription information from the UDM, wherein the PDU session management subscription information comprises subscription information of the default GBR QoS flow, and wherein the subscription information of the default GBR QoS flow comprises a fifth generation (5G) QoS identifier (5QI), an allocation and retention priority (ARP), a guaranteed flow bit rate (GFBR), and a maximum flow bit rate (MFBR).

9. The communications system of claim 6 , wherein the SMF is further configured to reject a request for establishing a non-GBR QoS flow in the PDU session.

10. The communications system of claim 6 , wherein the default GBR QoS flow comprises a time-sensitive GBR QoS flow.

11. A computer program product comprising computer-executable instructions stored on a non-transitory computer-readable medium that, when executed by a processor, cause a session management function (SMF) to:

receive first information from an access and mobility management function (AMF);

obtain protocol data unit (PDU) session management subscription information from a unified data management (UDM) module; and

establish, based on the first information and at least one of the PDU session management subscription information or local PDU session policy information of the SMF, a default GBR QoS flow in the PDU session when dynamic policy and charging control (PCC) is not deployed.

12. The computer program product of claim 11 , wherein the first information comprises second information, wherein the second information is at least one of a subscription permanent identifier (SUPI), a data network name (DNN), single network slice selection assistance information (S-NASSI), service indication information, a default GBR QoS flow indication, QoS index information, or QoS parameter information.

13. The computer program product of claim 12 , wherein the instructions further cause the SMF to:

send a subscription information request message to the UDM carrying the second information; and

receive the PDU session management subscription information from the UDM, wherein the PDU session management subscription information comprises subscription information of the default GBR QoS flow, and wherein the subscription information of the default GBR QoS flow comprises a fifth generation (5G) QoS identifier (5QI), an allocation and retention priority (ARP), a guaranteed flow bit rate (GFBR), and a maximum flow bit rate (MFBR).

14. The computer program product of claim 11 , wherein the instructions further cause the SMF to reject a request for establishing a non-GBR QoS flow in the PDU session.

15. The method of claim 2 , wherein the first information comprises second information, wherein the second information is the DNN.

16. The method of claim 2 , wherein the first information comprises second information, wherein the second information is the S-NASSI.

17. The method of claim 2 , wherein the first information comprises second information, wherein the second information is the service indication information.

18. The method of claim 2 , wherein the first information comprises second information, wherein the second information is the default GBR QoS flow indication.

19. The method of claim 2 , wherein the first information comprises second information, wherein the second information is the QoS index information.

20. The method of claim 2 , wherein the first information comprises second information, wherein the second information is the QoS parameter information.