Section: 5.8.2.5 Control of User Plane Forwarding 5.8.2.5.1 General
Content: The SMF controls user-plane packet forwarding for traffic detected by a PDR by providing a FAR with instructions to the UPF, including: - Forwarding operation information; - Forwarding target information. The details of the forwarding target and operation will depend on the scenario and is described below. The following forwarding functionality is required by the UPF: - Apply N3 /N9 tunnel related handling, i.e. encapsulation. - Forward the traffic to/from the SMF, e.g. as described in Table 5.8.2.5.2-1. - Forward the SM PDU DN Request Container from SMF to DN-AAA server - Forward the traffic according to locally configured policy for traffic steering. - Forward the traffic according to N4 rules of a 5G VN group for 5G VN group communication. - Forward the traffic to/from the EASDF. Data forwarding between the SMF and UPF is transmitted on the user plane tunnel established on N4 interface, defined in TS 29.244[ Interface between the Control Plane and the User Plane nodes ]  [65].