Section: O.1 A PDU Session with multiple QoS Flows for different groups
Content: In case the UE Application sends individual copies of data to different receivers, 5GS allows UE to simultaneously send data to different groups with different QoS policy via the following: - If different groups (IP or Ethernet multicast groups) are associated to the same DNN and S-NSSAI combination used for a 5G VN group, then different QoS Flows of a single PDU Session may be used to transfer the data copy sent to different groups. Figure O.1-1 shows a PDU Session with multiple QoS Flows for different groups as an example. - Group1 (G1): a group of multicast address 1 with members UE1 and UE2 is associated with 5GVN.A group. The QoS for multicast address 1 is set to QoS1. For G1, its members, multicast address 1 and corresponding QoS1 are provisioned as part of the AF requested QoS information as described in clause 6.1.3.28 of TS 23.503[ Policy and charging control framework for the 5G System (5GS); Stage 2 ]  [45]. - Group2 (G2): a group of multicast address 2 with members UE1 and UE3 is associated with 5GVN.A group. The QoS for multicast address 2 is set to QoS2. For G2, its members, multicast address 2 and corresponding QoS2 are provisioned as part of the AF requested QoS information as described in clause 6.1.3.28 of TS 23.503[ Policy and charging control framework for the 5G System (5GS); Stage 2 ]  [45]. - During establishment or modification procedure for PDU Sessions targeting to DNN and S-NSSAI for 5GVN.A group, or upon detection of the UE joining a multicast address, the SMF and PCF can jointly use the AF requested QoS information for 5GVN.A group to set up the QoS flow in respective member's PDU Session. As a result: - There will have two QoS flows in UE1's PDU Session targeting to DNN and S-NSSAI for 5GVN.A group, one QoS flow (QoS Flow 1.1) is used to carry data destined to multicast address 1 with QoS1, the other one (QoS Flow 1.2) is used to carry data destined to multicast address 2 with QoS2. - There will have one QoS flow (QoS Flow 2) in UE2's PDU Session targeting to DNN and S-NSSAI for 5GVN.A group, this QoS flow is used to carry data destined to multicast address 1 with QoS1. - There will have one QoS flow (QoS Flow 3) in UE3's PDU Session targeting to DNN and S-NSSAI for 5GVN.A group, this QoS flow is used to carry data destined to multicast address 2 with QoS2. - UE1 sends data with multicast address 1 (MA.1) to a UPF via QoS Flow 1.1 of UE1's PDU session for 5GVN.A group. The UPF forwards the packet to UE2 as it is a member of multicast group represented by multicast address 1 via QoS Flow 2 of UE2's PDU Session for 5GVN.A group. - UE1 also sends the same data with multicast address 2 (MA.2) to the UPF via QoS Flow 1.2 of the same PDU Session for 5GVN.A group. The UPF forwards the packet to UE3 as it is a member of multicast group represented by multicast address 2 via QoS Flow 3 of UE3'sPDU Session for 5GVN.A group. Figure O.1-1: A PDU Session with multiple QoS Flows for different groups