Always-on packet data unit session indication
A session management function (SMF) receives, from a wireless device, an indication that an always-on packet data unit (PDU) session is requested. The SMF determines to establish the PDU session as an always-on PDU session based on: the indication that the always-on PDU session is requested; and the PDU session being for an ultra-reliable low-latency communication (URLLC) service. The SMF sends, to the wireless device, an indication that the PDU session is to be established as the always-on PDU session.
1. A method comprising:
receiving, by a session management function (SMF) from a wireless device, a packet data unit (PDU) session establishment request message comprising:
an indication that an always-on PDU session is requested; and
an indication that the always-on PDU session is for an ultra-reliable low-latency communication (URLLC) service;
determining, by the SMF, to establish the PDU session as an always-on PDU session based on:
the indication that the always-on PDU session is requested; and
the PDU session being for the URLLC service; and
sending, by the SMF to the wireless device, a PDU session establishment accept message comprising an indication that the PDU session is to be established as the always-on PDU session.
2. The method of claim 1 , wherein the determining is based on the URLLC service being on a list of services for which the always-on PDU session is allowed.
3. The method of claim 2 , wherein the list of services for which the always-on PDU session is allowed indicates at least one of:
the URLLC service;
emergency service;
vehicle-to-everything (V2X) service;
internet of things (IoT) service; and
voice over long term evolution (LTE) service.
4. The method of claim 2 , wherein the list of services for which the always-on PDU session is allowed is received from a unified data management (UDM).
5. The method of claim 4 , further comprising sending, by the SMF to the UDM, a subscription retrieval request indicating that the list of services is requested.
6. The method of claim 1 , wherein the PDU session establishment request message comprises a PDU session identifier of the PDU session.
7. The method of claim 1 , wherein the PDU session establishment request message comprises an information element indicating that the always-on PDU session is requested.
8. The method of claim 1 , wherein the PDU session establishment accept message indicates successful establishment of the PDU session.
9. The method of claim 1 , wherein the PDU session establishment accept message comprises an information element indicating that the PDU session is an always-on PDU session.
10. A method comprising:
determining, by a wireless device, that data packets are for an ultra-reliable low-latency communication (URLLC) service;
sending, by the wireless device to a session management function (SMF), a packet data unit (PDU) session establishment request message comprising:
an indication that an always-on PDU session for the URLLC service is requested; and
an indication that the always-on PDU session is for an ultra-reliable low-latency communication (URLLC) service;
receiving, by the wireless device from the SMF and based on the PDU session establishment request message, a PDU session establishment accept message comprising an indication that the PDU session is to be established as the always-on PDU session.
11. The method of claim 10 , wherein the PDU session establishment request message comprises a PDU session identifier of the PDU session.
12. The method of claim 10 , wherein the PDU session establishment request message comprises an information element indicating that the always-on PDU session is requested.
13. The method of claim 10 , wherein the PDU session establishment accept message indicates successful establishment of the PDU session.
14. The method of claim 10 , wherein the PDU session establishment accept message comprises an information element indicating that the PDU session is an always-on PDU session.
15. A system comprising:
a wireless device comprising: one or more processors; and memory storing instructions that, when executed by the one or more processors, cause the wireless device to:
determine that data packets are for an ultra-reliable low-latency communication (URLLC) service;
send, to a session management function (SMF), a packet data unit (PDU) session establishment request message comprising:
an indication that an always-on PDU session for the URLLC service is requested; and
an indication that the always-on PDU session is for an ultra-reliable low-latency communication (URLLC) service;
receive, from the SMF, a PDU session establishment accept message comprising an indication that the PDU session is to be established as the always-on PDU session; and
the SMF, wherein the SMF comprises: one or more processors; and memory storing instructions that, when executed by the one or more processors, cause the SMF to:
receive, from the wireless device, the PDU session establishment request message comprising the indication that the always-on PDU session is requested;
determine to establish the PDU session as an always-on PDU session based on:
the indication that the always-on PDU session is requested; and
the PDU session being for the URLLC service; and
send, to the wireless device, the PDU session establishment accept message comprising the indication that the PDU session is to be established as the always-on PDU session.