A configuration to enable a UE to transmit an enhanced preamble to initiate a RACH procedure to improve coverage of PRACH without an excessive increase in usage of PRACH resources. The apparatus transmits, to a base station, a preamble to initiate a RACH procedure. The apparatus monitors for at least one RAR, from the base station, during a RAR window in response to the transmitted preamble. The apparatus transmits, to the base station, an enhanced preamble to initiate the RACH procedure if the at least one RAR is not received during the RAR window.