Method and mobile terminal for performing random access

A mobile terminal comprising:

• communication circuitry;
• and
• processing circuitry is configured to perform a first random access channel (RACH) procedure using the communications circuitry including:
• transmitting to a network a first RACH message including a first type of random access preamble selected by the mobile terminal from a set of random access preambles;
• receiving a second RACH message including a random access response from the network in response to the first RACH message;
• transmitting data to the network using a third RACH message;
• starting a contention resolution timer;
• monitoring a Physical Downlink Control Channel (PDCCH) for a fourth RACH message;
• determining that the first RACH procedure failed when the contention resolution timer expires;
• and
• observing a back-off time period,
• wherein the processing circuitry is configured to not monitor the PDCCH during the back-off time period, and
• wherein the processing circuitry is configured to perform a second RACH procedure using the communications circuitry after the back-off time period concludes.