Question: In a TDD (Time Division Duplexing) scenario, what action is taken by the Signal Source if the User Equipment does not send any decreased E-TFCI within 150ms after receiving a TPC_cmd = +1 command?
Option 1: The Signal Source proceeds to step 5, sending a TPC_cmd = -1 command to the User Equipment.
Option 2: The Signal Source confirms the current E-TFCI as the target and measures the mean power of the User Equipment.
Option 3: The Signal Source goes back to step 3, re-sending power control bits to give another TPC_cmd = +1 command to the User Equipment.
Option 4: The Signal Source fails the User Equipment conformance test due to non-compliance with E-TFCI adjustment.
Explanation: If the User Equipment does not respond with a decreased E-TFCI within the specified timeframe (150ms) after receiving an increment command (TPC_cmd = +1), the Signal Source reiterates the increment command, ensuring the User Equipment's power is appropriately adjusted before proceeding.