Question: What happens when a Downlink (DL) data frame arrives at the User Equipment (UE) before the specified Time of Arrival Window Startpoint (ToAWS) in a UTRAN Iur interface?
Option 1: The UE processes the DL data frame immediately, as it is within the expected timing range.
Option 2: The UE buffers the DL data frame until ToAWS is reached to ensure synchronized processing.
Option 3: The UE discards the DL data frame due to premature arrival, awaiting frames starting at ToAWS.
Option 4: The UE responds with a Timing Adjustment Control frame to adjust synchronization.
Explanation: If a DL data frame arrives before the specified ToAWS in a UTRAN Iur interface, it indicates a timing mismatch. In response, the UE sends a Timing Adjustment Control frame to correct and synchronize the timing between the UE and the network, ensuring proper data reception and processing.