Method and apparatus for determining protocol data unit session service network element
A method and an apparatus for determining a protocol data unit (PDU) session service network element to control an aggregated maximum bit rate (AMBR), where the method includes receiving, by a control plane function network element, a request for establishing a first PDU session from a mobility management device, where the request for establishing the first PDU session includes a first data network name (DNN), determining, by the control plane function network element, that a same control plane function network element and a same user plane function network element need to be selected for a PDU session corresponding to the first DNN, and sending, by the control plane function network element, first indication information to the mobility management device, where the first indication information is used to indicate that a same control plane function network element needs to be selected for the PDU session corresponding to the first DNN.
1. A method for determining a protocol data unit (PDU) session service network element, wherein the method comprises:
receiving, by a first control plane function network element from a first mobility management device, a request for establishing a first PDU session, wherein the request comprises a first data network name (DNN) that the first PDU session is to be connected;
determining, by the first control plane function network element based on the first DNN that the first PDU session is to be connected, to select a first user plane function network element for the first PDU session; and
selecting, by the first control plane function network element for the first PDU session, the first user plane function network element, wherein the first user plane function network element is for serving an established PDU session connected to the first DNN.
2. The method of claim 1 , further comprising:
receiving, by the first mobility management device, the request from a terminal;
determining, by the first mobility management device according to the first DNN, the first control plane function network element; and
sending, by the first mobility management device, the request to the first control plane function network element.
3. The method of claim 2 , further comprising determining, by the first mobility management device, to select a same control plane function network element for PDU sessions with the first DNN.
4. The method of claim 3 , wherein the first control plane function network element is a control plane function network element that serves the established PDU session.
5. The method of claim 1 , wherein the request further comprises first single network slice selection assistance information (S-NSSAI), and wherein the established PDU session is associated with the first DNN and the first S-NSSAI.
6. The method of claim 1 , further comprising determining, by the first control plane function network element, to switch the first PDU session to an Evolved Packet Core (EPC) network.
7. The method of claim 1 , wherein determining to select the first user plane function network element for the first PDU session with the first DNN comprises determining, by the first control plane function network element based on subscription data, to select the first user plane function network element as a same user plane function network element for serving all PDU sessions with the first DNN.
8. The method of claim 7 , wherein the subscription data indicates the first PDU to be switched to an Evolved Packet Core (EPC) network.
9. The method of claim 1 , further comprising:
receiving, by the first mobility management device, the request from a terminal; and
sending, by the first mobility management device, the request for establishing the first PDU session to a first control plane function network element.
10. A communications system comprising:
a mobility management device configured to:
receive a request for establishing a first protocol data unit (PDU) session from a terminal, wherein the request comprises a first data network name (DNN) that the first PDU session is to be connected; and
send the request; and
a first control plane function network element configured to:
receive the request from the mobility management device;
determine, based on the first DNN that the first PDU session is to be connected, to select a first user plane function network element for the first PDU session; and
select, for the first PDU session, the first user plane function network element, wherein the first user plane function network element is for serving an established PDU session connected to the first DNN.
11. The communications system of claim 10 , wherein the mobility management device is further configured to determine to select a same control plane function network element for PDU sessions with the first DNN.
12. The communications system of claim 10 , wherein the first control plane function network element is a control plane function network element that serves the established PDU session.
13. The communications system of claim 10 , wherein the request further comprises first single network slice selection assistance information (S-NSSAI), and wherein the established PDU session is associated with the first DNN and the first S-NSSAI.
14. The communications system of claim 10 , wherein the first control plane function network element is further configured to determine to switch the first PDU session to an Evolved Packet Core (EPC) network.
15. The communications system of claim 10 , wherein the first control plane function network element is further configured to determine, based on subscription data, to select the first user plane function network element as a same user plane function network element for serving all PDU sessions with the first DNN.
16. The communications system of claim 15 , wherein the subscription data indicates the first PDU to be switched to an Evolved Packet Core (EPC) network.
17. An apparatus, comprising:
at least one processor; and
a memory coupled to the at least one processor and having program instructions stored thereon which, when executed by the at least one processor, cause the apparatus to:
receive, from a first mobility management device, a request for establishing a first protocol data unit (PDU) session, wherein the request comprises a first data network name (DNN) that the first PDU session is to be connected;
determine, based on the first DNN that the first PDU session to be connected, to select a first user plane function network element for the first PDU session; and
select, for the first PDU session, the first user plane function network element, wherein the first user plane function network element is for serving an established PDU session connected to the first DNN.
18. The apparatus of claim 17 , wherein the request further comprises first single network slice selection assistance information (S-NSSAI), and wherein the established PDU session is associated with the first DNN and the first S-NSSAI.
19. The apparatus of claim 17 , wherein the program instructions further cause the apparatus to determine, based on subscription data, to select the first user plane function network element as a same user plane function network element for serving all PDU sessions with the first DNN.
20. The apparatus of claim 19 , wherein the subscription data indicates the first PDU to be switched to an Evolved Packet Core (EPC) network.