Apparatus and method for random access in wireless communication system using beamforming

A terminal in a wireless environment comprising:

• a transceiver configured to:
• receive, from a base station (BS), one or more set of one or more synchronization signal with one or more broadcast signal transmitted via one or more downlink (DL) transmit (Tx) beam, and
• receive, from the BS, configuration information indicating a first configured number of at least one set of at least one synchronization signal with at least one broadcast signal transmitted via at least one DL Tx beam mapped to each random access channel (RACH) opportunity, wherein the configuration information further indicates a second configured number of RACH sequences for each DL Tx beam;
• and
• at least one processor, operably coupled to the transceiver, configured to determine a RACH opportunity corresponding to a set of a synchronization signal with a broadcast signal transmitted via a DL Tx beam from among the one or more set based on the configuration information,
• wherein the transceiver is further configured to transmit, to the BS, a RACH sequence through the determined RACH opportunity.

A base station (BS) in a wireless environment comprising:

• at least one processor;
• and
• a transceiver, operably coupled to the at least one processor, configured to:
• transmit, to a terminal, at least one set of at least one synchronization signal with at least one broadcast signal via at least one downlink (DL) transmit (Tx) beam, and
• receive, from the terminal, a random access channel (RACH) sequence through a RACH opportunity corresponding to a set of a synchronization signal with a broadcast signal,
• wherein the RACH opportunity is determined based on configuration information indicating a first configured number of at least one set of at least one synchronization signal with at least one broadcast signal transmitted via at least one DL Tx beam mapped to each RACH opportunity, wherein the configuration information further indicates a second configured number of RACH sequences for each DL Tx beam, and
• wherein the configuration information is transmitted by the BS through the transceiver to the terminal.