name: GW
full_form: Gateway
context: last property listed above in access networks that support it. In the case that PCC is used, a GW control session is established between the Trusted Access and the PCRF. This GW control session is identified by the UE ID and the IP address allocated to the UE (i.e. CoA if DSMIPv6 is used). Using the GW control session, the UE is restricted to limited access; in particular, the Trusted Access restricts the forwarding of the packets only to IKEv2 and BU messages until the binding at the PDN GW is established. The Trusted Access knows when the binding is established at the PDN GW because it receives an update of the GW control session. The flows for this control of policy are given in section(s) 6.3 and 6.6.2 of TS 23.402. This prevents a UE that attaches to the Trusted Access from sending non-signalling traffic to the PDN GW until it has completed a BU with the PDN GW and prevents an impersonation attack.
description: A Gateway (GW) is a network function that controls and manages data traffic between different networks or sub-networks. In the context of 3GPP TS 33.402, the GW plays a crucial role in restricting user equipment (UE) access to limited resources until a binding at the PDN GW is established.
explanation: The GW is classified as a Network Function because it acts as an intermediary between different network segments, controlling and directing data traffic based on predetermined policies. The context highlights its role in establishing a control session, restricting UE access, and preventing impersonation attacks.
section_title: 9.2.2.1	General
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