Question: In a conformance testing scenario for User Equipment (UE) as per 3GPP specifications, what is the required state of the UE before initiating a test case in a basic single cell environment, assuming no specific override is mentioned in the test case?
Option 1: Connected Mode with Dedicated RB Established (State 4)
Option 2: Registered Idle Mode state (State 2) or Generic RB Established (State 3), with no prior Communication with the ProSe Function
Option 3: ECM-Connected State with E-RABs established
Option 4: Registered Idle Mode state (State 2) or in state Generic RB Established (State 3), after initial Communication with the ProSe Function has taken place since UE power-on
Explanation: For conformance testing in a basic single cell environment, as defined by 3GPP, the UE must be in either Registered Idle Mode or have a Generic Radio Bearer (RB) Established. Additionally, to ensure a standardized starting point, initial communication with the Proximity Services (ProSe) Function must have occurred since the UE was last powered on, aligning with the setup for testing scenarios involving network interactions from a known baseline state.