Question: Upon receiving a NACK on the Acquisition Indication Channel (AICH), what is the expected behavior of the User Equipment (UE) regarding preamble transmission and backoff timer TB01?
Option 1: Immediately restart preamble transmission after receiving the NACK, without waiting for the expiration of TB01.
Option 2: Stop transmitting preambles, wait for the expiration of TB01, and then repeat the ramping procedure, starting from the first preamble in the cycle.
Option 3: Transmit an additional set of preambles within 100 ms after receiving the NACK before considering the backoff timer TB01.
Option 4: Ignore the NACK and continue with the current transmission sequence without interruption.
Explanation: This option correctly reflects the specified behavior for a UE upon receiving a NACK on the AICH. The UE must cease preamble transmissions, await the expiration of the backoff timer TB01, and then initiate another ramping cycle. This process ensures orderly reattempt at connection setup while preventing immediate congestion.