Question: When a UE connected to E-UTRA/5GC undergoes inter-system fallback towards E-UTRAN due to unsupported services by the 5GC, what are the possible outcomes based on factors like CN interface availability and radio conditions?
Option 1: Only RRC IDLE state mobility (redirection) is triggered.
Option 2: Only RRC CONNECTED state mobility (handover procedure) is triggered.
Option 3: The UE switches to a different frequency band within the same network.
Option 4: Either RRC CONNECTED state mobility (handover procedure) or RRC IDLE state mobility (redirection) may result.
Explanation: According to telecom concepts related to mobility procedures in E-UTRA connected to 5GC, inter-system fallback towards E-UTRAN can lead to different outcomes based on network and radio conditions. These outcomes include both RRC CONNECTED state mobility (handover procedure) and RRC IDLE state mobility (redirection), highlighting the network's flexibility in managing UE connectivity under varying circumstances.