Question: In a scenario where a UE does not receive a Random Access Response, what action is taken after the backoff time expires, assuming the UE has already transmitted the preamble 4 times without response?
Option 1: The UE transmits the same preamble with increased power, regardless of its power class.
Option 2: The UE selects a new preamble and transmits it with the minimum required power (14 dBm) for all power classes.
Option 3: The UE waits for an additional backoff period before re-transmitting the same preamble at the previously calculated NPRACH transmission power.
Option 4: The UE re-selects a preamble and transmits it with the calculated NPRACH transmission power, which is based on its specific power class (e.g., 23 dBm for Power Class 3).
Explanation: After not receiving a response and the backoff time expiring, the UE selects a new preamble and transmits it with power calculated based on its power class, reflecting adaptive transmission power management in telecom networks.