The article discusses the Emergency Services FallBack (ES-FB) feature in 5G systems. This is a new solution that doesn’t have an equivalent in 4G systems. The User Equipment (UE) uses a service request for emergencies towards the Access and Mobility Management Function (AMF) if the AMF has indicated support for this feature. The AMF then interacts with the gNodeB (gNB) to perform Evolved Packet System (EPS) Fallback.
The article further explains that if the 5G Core (5GC) has indicated ES-FB support for the Tracking Area (TA) and Radio Access Technology (RAT) where the UE is currently camping, and if the UE supports emergency services fallback, the UE will initiate the ES-FB procedure.
The article also provides a detailed step-by-step explanation of the ES-FB procedure, including the registration procedure and call flow for emergency service fallback. It also discusses what happens when ES-FB occurs during Quality of Service (QoS) Flow establishment.
The article concludes with a list of references that provide more information on the topic, including various technical specifications and guidelines from the 3rd Generation Partnership Project (3GPP) and the GSM Association (GSMA).
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