User plane function selection for isolated network slice
Systems, apparatuses, and methods are described for wireless communications. A session request for a wireless device may comprise a network slice isolation information parameter. A user plane function may be selected, based on the network slice isolation information parameter, to provide the requested session for the wireless device.
1. A method comprising:
receiving, by a session management function (SMF) from an access and mobility management function (AMF), a first message indicating a request to establish a packet data unit (PDU) session and comprising a network slice isolation information parameter;
sending, to a network repository function (NRF) and based on a determination that a user plane function (UPF) is required for the PDU session, a second message comprising:
the network slice isolation information parameter; and
a network slice identifier of the PDU session;
receiving, from the NRF and based on the second message, a third message comprising an identifier of a selected UPF, wherein the selected UPF is associated with the network slice identifier of the PDU session; and
sending, to the selected UPF, a fourth message comprising a request to establish the PDU session.
2. The method of claim 1 , further comprising, receiving from the selected UPF, a fifth message comprising a response to the request to establish the PDU session.
3. The method of claim 1 , wherein the first message further comprises:
an identifier of the PDU session;
an identifier of a wireless device associated with the PDU session; and
the network slice identifier of the PDU session.
4. The method of claim 1 , wherein the fourth message comprises an N4 PDU session establishment request.
5. The method of claim 1 , further comprising determining, based on the network slice isolation information parameter, a UPF selection rule.
6. The method of claim 5 , wherein the UPF selection rule comprises an isolation policy comprising at least one of:
a logical full isolation of network slices;
a physical full isolation of the network slices; or
network functions that are allowed to be shared among the network slices.
7. The method of claim 5 , wherein the UPF selection rule is based on a network slice coexistence constraint.
8. A method comprising:
receiving, by a session management function (SMF) from an access and mobility management function (AMF), a first message indicating a request to establish a packet data unit (PDU) session and comprising a network slice isolation information parameter;
sending, to a unified data management (UDM) and based on a determination that a user plane function (UPF) is required for the PDU session, a second message comprising:
the network slice isolation information parameter; and
a network slice identifier of the PDU session;
receiving, from the UDM and based on the second message, a third message comprising subscriber data for a wireless device associated with the PDU session;
selecting, based on the subscriber data, a first UPF for the PDU session and associated with the network slice identifier of the PDU session; and
sending, to the first UPF, a fourth message comprising a request to establish the PDU session.
9. The method of claim 8 , further comprising, receiving from the first UPF, a fifth message comprising a response to the request to establish the PDU session.
10. The method of claim 8 , wherein the first message further comprises:
an identifier of the PDU session;
an identifier of the wireless device associated with the PDU session; and
the network slice identifier of the PDU session.
11. The method of claim 8 , wherein the fourth message comprises an N4 PDU session establishment request.
12. The method of claim 8 , further comprising determining, based on the network slice isolation information parameter, a UPF selection rule.
13. The method of claim 12 , wherein the UPF selection rule comprises an isolation policy comprising at least one of:
a logical full isolation of network slices;
a physical full isolation of the network slices; or
network functions that are allowed to be shared among the network slices.
14. The method of claim 12 , wherein the UPF selection rule is based on a network slice coexistence constraint.
15. A method comprising:
receiving, by a network repository function (NRF) from a session management function (SMF), a first message indicating that a user plane function (UPF) is required for a packet data unit (PDU) session and comprising:
a network slice isolation information parameter; and
a network slice identifier of the PDU session;
selecting, based on the network slice isolation information parameter and the network slice identifier of the PDU session, a first UPF; and
sending, to the session management function, a second message comprising an identifier of the first UPF.
16. The method of claim 15 , further comprising receiving, from a unified data management (UDM), the network slice isolation information parameter.
17. The method of claim 15 , further comprising:
receiving, from the first UPF, a registration request message comprising:
a single network slice selection assistance information (S-NSSAI) associated with the first UPF; and
the identifier of the first UPF.
18. The method of claim 15 , further comprising:
receiving, from the first UPF:
a domain name of the first UPF;
a data network name; or
an address of the first UPF.
19. The method of claim 15 , further comprising:
sending, to a unified data management (UDM), a third message comprising:
the network slice isolation information parameter; and
the network slice identifier of the PDU session; and
receiving, from the UDM and based on the third message, a fourth message comprising subscriber data for a wireless device.
20. The method of claim 19 , wherein the selecting the first UPF comprises:
determining, based on the subscriber data for the wireless device, the first UPF for the PDU session.
21. An apparatus comprising:
one or more processors; and
memory storing instructions that, when executed by the one or more processors, cause the apparatus to:
receive, from an access and mobility management function (AMF), a first message indicating a request to establish a packet data unit (PDU) session and comprising a network slice isolation information parameter;
send, to a network repository function (NRF) and based on a determination that a user plane function (UPF) is required for the PDU session, a second message comprising:
the network slice isolation information parameter; and
a network slice identifier of the PDU session;
receive, from the NRF and based on the second message, a third message comprising an identifier of a selected UPF, wherein the selected UPF is associated with the network slice identifier of the PDU session; and
send, to the selected UPF, a fourth message comprising a request to establish the PDU session.
22. The apparatus of claim 21 , wherein the instructions, when executed by the one or more processors, further cause the apparatus to receive from the selected UPF, a fifth message comprising a response to the request to establish the PDU session.
23. The apparatus of claim 21 , wherein the first message further comprises:
an identifier of the PDU session;
an identifier of a wireless device associated with the PDU session; and
the network slice identifier of the PDU session.
24. The apparatus of claim 21 , wherein the fourth message comprises an N4 PDU session establishment request.
25. The apparatus of claim 21 , wherein the instructions, when executed by the one or more processors, further cause the apparatus to determine, based on the network slice isolation information parameter, a UPF selection rule.
26. The apparatus of claim 25 , wherein the UPF selection rule comprises an isolation policy comprising at least one of:
a logical full isolation of network slices;
a physical full isolation of the network slices; or
network functions that are allowed to be shared among the network slices.
27. The apparatus of claim 25 , wherein the UPF selection rule is based on a network slice coexistence constraint.