Group communication session inactivity notification
A session management function (SMF) sends, to a user plane function (UPF), a session configuration message comprising a packet detection rule (PDR) for a group communication session, wherein the PDR comprises a multicast address mapped to a plurality of wireless devices associated with the group communication session, and a forwarding rule associated with the multicast address. The SMF receives, from the UPF, a notification of inactivity for the group communication session associated with the multicast address. The SMF sends, to the UPF and after receiving the notification of inactivity, a session modification request comprising a downlink tunnel configuration for the multicast data.
1. A session management function (SMF) comprising:
one or more processors; and
memory storing instructions that, when executed by the one or more processors, cause the SMF to:
send, to a user plane function (UPF), a session configuration message comprising a packet detection rule (PDR) for a group communication session, wherein the PDR comprises:
a multicast address mapped to a plurality of wireless devices associated with the group communication session; and
a forwarding rule associated with the multicast address;
receive, from the UPF, a notification of inactivity for the group communication session associated with the multicast address; and
send, to the UPF and after receiving the notification of inactivity, a session modification request comprising a downlink tunnel configuration for multicast data.
2. The SMF of claim 1 , wherein the session modification request comprises a buffering configuration for the multicast data.
3. The SMF of claim 1 , wherein the notification of inactivity comprises an N4 session identifier of a PDU session associated with the group communication session.
4. The SMF of claim 1 , wherein the instructions further cause the SMF to determine a corresponding group based the notification of inactivity.
5. The SMF of claim 1 , wherein the SMF deactivates the group communication session based on the notification of inactivity.
6. The SMF of claim 1 , wherein the instructions further cause the SMF to initiate an N4 session release procedure.
7. The SMF of claim 6 , wherein the N4 session release procedure is to deactivate a user plane connection.
8. The SMF of claim 1 , wherein the downlink tunnel configuration is for disabling a tunnel associated with the group communication session.
9. The SMF of claim 1 , wherein the notification of inactivity comprises the multicast address.
10. The SMF of claim 1 , wherein the multicast address comprises:
a multicast IP address; or
a multicast MAC address.
11. A user plane function (UPF) comprising:
one or more processors; and
memory storing instructions that, when executed by the one or more processors, cause the UPF to:
receive, from a session management function (SMF), a session configuration message comprising a packet detection rule (PDR) for a group communication session, wherein the PDR comprises:
a multicast address mapped to a plurality of wireless devices associated with the group communication session; and
a forwarding rule associated with the multicast address;
send, to the SMF, a notification of inactivity for the group communication session associated with the multicast address; and
receive, from the SMF and after sending the notification of inactivity, a session modification request comprising a downlink tunnel configuration for multicast data.
12. The UPF of claim 11 , wherein the sending the notification of inactivity is based on detecting that one or more PDU sessions associated with the group communication session have no data transfer for a period specified by an inactivity timer.
13. The UPF of claim 11 , wherein the session modification request comprises a buffering configuration for the multicast data.
14. The UPF of claim 13 , wherein the instructions further cause the UPF to buffer data packets based on the buffering configuration.
15. The UPF of claim 11 , wherein the notification of inactivity comprises an N4 session identifier of a PDU session associated with the group communication session.
16. The UPF of claim 11 , wherein the SMF deactivates the group communication session based on the notification of inactivity.
17. The UPF of claim 16 , wherein an N4 session release procedure is to deactivate a user plane connection.
18. The UPF of claim 11 , wherein the downlink tunnel configuration is for disabling a tunnel associated with the group communication session.
19. The UPF of claim 11 , wherein the notification of inactivity comprises the multicast address.
20. The UPF of claim 11 , wherein the multicast address comprises:
a multicast IP address; or
a multicast MAC address.