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1. A random access method performed by an apparatus in a wireless network environment, comprising: selecting a given preamble in response to receiving a synchronization signal block from a base station; transmitting, to the base station, a first message including the selected given preamble by using sequential beam-sweeping; transmitting a third message for a connection request for uplink data transmission in response to receiving, from the base station, a second message responding to the transmitted first message, wherein the third message is transmitted using beam-switching; and completing a random access channel operation in response to receiving a fourth message responding to the transmitted third message, wherein transmitting the third message includes: determining a random beam sequence in response to receiving the second message from the base station, and transmitting, to the base station, the third message for a connection request for the uplink data transmission by using beam-switching using the determined random beam sequence.
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