AF initiated always-on PDU session

1. A method comprising:

receiving, by a policy control function (PCF) from an application function (AF), a first message comprising:

an always-on packet data unit (PDU) session requested indication;

an identity of a wireless device; and

application service information;

mapping, by the PCF based on the first message, the application service information to an always-on PDU session for the wireless device; and

sending, by the PCF to a session management function (SMF), at least one policy and charging rule for the always-on PDU session.

2. The method of claim 1 , further comprising mapping, by the PCF, the application service information to the always-on PDU session based on a quality of service (QoS) of the application service information from the AF or a QoS supported by the always-on PDU session.

3. The method of claim 2 , further comprising mapping, by the PCF, the application service information to the always-on PDU session if the QoS of the application service information is supported by an always-on PDU session.

4. The method of claim 1 , further comprising mapping, by the PCF, the application service information to the always-on PDU session based on network slice information, wherein the network slice information comprises single network slice selection assistance information (S-NSSAI) or a S-NSSAI associated network slice instance identifier.

5. The method of claim 1 , further comprising mapping, by the PCF, the application service information to the always-on PDU session based on the identity of the wireless device, wherein the identity of the wireless device comprises subscriber permanent identifier.

6. The method of claim 1 , further comprising mapping, by the PCF, the application service information to the always-on PDU session based on a UE IP address, wherein the UE IP address comprises UE IPv4 address or UE IPv6 network prefix.

7. The method of claim 1 , further comprising mapping, by the PCF, the application service information to the always-on PDU session based on a data network name (DNN).

8. The method of claim 1 , further comprising mapping, by the PCF, the application service information to the always-on PDU session based on internet protocol (IP) filter information.

9. The method of claim 1 , wherein the first message further comprises a data network name (DNN).

10. The method of claim 1 , wherein the first message further comprises at least one single network slice selection assistance information (S-NSSAI) or at least one S-NSSAI associated network slice instance identifier.

11. The method of claim 1 , wherein the application service information comprises an information element indicating internet protocol (IP) filter information to identify a service data flow.

12. The method of claim 1 , wherein the application service information comprises an information element indicating a media type.

13. The method of claim 1 , wherein the application service information comprises an information element indicating a media or an application bandwidth requirement for quality of service (QoS) control.

14. The method of claim 1 , wherein the application service information comprises an information element indicating an application identifier to identify an application or service.

15. The method of claim 1 , wherein the identity of the wireless device comprises at least one of:

a subscription permanent identifier (SUPI);

a permanent equipment identifier (PEI); or

a generic public subscription identifier (GPSI).

16. The method of claim 1 , further comprising receiving, by the PCF from the SMF, a third message comprising the always-on PDU session requested indication for at least one PDU session.

17. The method of claim 16 , further comprising determining, by the PCF based on the always-on PDU session requested indication, an always-on PDU session granted indication indicating at least one PDU session to be the always-on PDU session.

18. The method of claim 17 , further comprising sending, by the PCF to the SMF, a fourth message comprising the always-on PDU session granted indication.

19. A method comprising:

receiving, by a policy control function (PCF) from an application function (AF), a first message comprising:

an always-on packet data unit (PDU) session requested indication;

an identity of a wireless device; and

application service information;

mapping, by the PCF based on the first message, the application service information to an always-on PDU session for the wireless device;

determining, by the PCF based on the application service information, at least one policy and charging rule for the always-on PDU session; and

sending, by the PCF to a session management function (SMF), a second message comprising the at least one policy and charging rule.

20. A method comprising:

receiving, by a session management function (SMF) from a policy control function (PCF), a first message comprising:

an always-on packet data unit (PDU) session request indication;

an identity of a wireless device; and

at least one policy and charging rule;

determining, by the SMF, creation of an always-on PDU session based on the first message;

sending, by the SMF to the wireless device via an access and mobility management function (AMF), a second message requesting establishment of the always-on PDU session, the second message comprising the always-on PDU session request indication and the identity of the wireless device; and

receiving, by the SMF from the wireless device, a third message requesting establishment of the always-on PDU session.