Question: What happens when a Downlink (DL) data frame arrives after the specified ToAWE (Window Endpoint) in a UTRAN Iur interface, relative to the Latest Time of Arrival (LtoA)?
Option 1: The receiving node sends an acknowledgement (ACK) for the DL data frame immediately.
Option 2: The system adjusts the LtoA value to accommodate the late-arriving DL data frame.
Option 3: The UTRAN initiates a handover procedure due to perceived timing issues.
Option 4: A Timing Adjustment Control frame response is triggered in response to the late arrival.
Explanation: According to the specified behavior for ToAWE, if a DL data frame arrives after this defined window endpoint (relative to LtoA), the system responds with a Timing Adjustment Control frame. This mechanism ensures synchronization and timing adjustments are made when data frames do not meet the expected arrival time, maintaining network efficiency and reducing potential errors or packet loss.