Question: In a conformance testing setup for User Equipment (UE) with ideal radio conditions and default parameters on a single cell, what is the required state of the UE at the commencement of the test procedure?
Option 1: RRC_IDLE (State 1), with an established PDN connection
Option 2: RRC_CONNECTED (State 2), Registered
Option 3: ECM-IDLE (State 3) with a pending bearer activation
Option 4: EMM-REGISTERED, but not yet attached to the network
Explanation: For this test scenario, the UE must be in an active communication state. Being in RRC_CONNECTED (State 2) and Registered ensures the UE is fully connected, allowing for comprehensive testing of its capabilities in an optimal environment, enabling immediate data transfer and signaling crucial for conformance testing.