Question: In a conformance testing setup for an NB-IoT UE, as per the specified initial conditions, what is the required state of the NB-IoT User Equipment (UE) during the procedure under ideal radio conditions?
Option 1: Idle State (ECM-Idle)
Option 2: Connected mode (State 2A-NB), specifically in NB-IoT UE Attach
Option 3: Detached State, awaiting initial attach
Option 4: In Service Request procedure, transitioning to Connected mode
Explanation: The correct answer is Option 2 because, according to the specified initial conditions for conformance testing of an NB-IoT UE, the device must be in a state that allows for immediate data or signaling exchange without needing to establish a connection first. State 2A-NB, Connected mode with NB-IoT UE Attach, ensures the UE is already attached and connected, facilitating the test procedure under ideal radio conditions as defined. This state is crucial for testing the UE's behavior in an active, connected scenario, which is a key aspect of conformance testing.