A method for mmWave beam detection and tracking, the method comprising: receiving a set of known reference signals from a base station, over a broadcast channel; detecting a plurality of downlink beams from the base station, each downlink beam comprising a respective reference signal comprising associated time offset information; determining a favorable downlink beam of the plurality of downlink beams and decoding the time offset information embedded within the favorable downlink beam; and transmitting a random access preamble sequence to the base station in a time slot indicated by the time offset information of the favorable downlink beam; wherein a transmit power for transmitting the random access preamble sequence is based on open-loop transmit power control that does not use feedback from the base station; wherein, the method further comprises: detecting feedback from the base station; increasing the transmit power upon no feedback is detected from the base station and the same downlink beams are detected again; and retransmitting the random access preamble sequence to the base station with the increased transmit power; or wherein, the method further comprises: detecting feedback from the base station; retransmitting the random access preamble sequence at the initial transmit power level upon no feedback is detected from the base station and downlink beams which are different from the downlink beams are detected. receiving a set of known reference signals from a base station, over a broadcast channel; detecting a plurality of downlink beams from the base station, each downlink beam comprising a respective reference signal comprising associated time offset information; determining a favorable downlink beam of the plurality of downlink beams and decoding the time offset information embedded within the favorable downlink beam; and transmitting a random access preamble sequence to the base station in a time slot indicated by the time offset information of the favorable downlink beam; wherein a transmit power for transmitting the random access preamble sequence is based on open-loop transmit power control that does not use feedback from the base station; wherein, the method further comprises: detecting feedback from the base station; increasing the transmit power upon no feedback is detected from the base station and the same downlink beams are detected again; and retransmitting the random access preamble sequence to the base station with the increased transmit power; or wherein, the method further comprises: detecting feedback from the base station; retransmitting the random access preamble sequence at the initial transmit power level upon no feedback is detected from the base station and downlink beams which are different from the downlink beams are detected. detecting feedback from the base station; increasing the transmit power upon no feedback is detected from the base station and the same downlink beams are detected again; and retransmitting the random access preamble sequence to the base station with the increased transmit power; or wherein, the method further comprises: detecting feedback from the base station; retransmitting the random access preamble sequence at the initial transmit power level upon no feedback is detected from the base station and downlink beams which are different from the downlink beams are detected. detecting feedback from the base station; retransmitting the random access preamble sequence at the initial transmit power level upon no feedback is detected from the base station and downlink beams which are different from the downlink beams are detected.