Method and apparatus for detecting physical random access channel in communication system

A communication node comprising:

• a processor;
• an interconnection controller;
• a reference sequence generator;
• a reconfiguration interconnection module;
• and
• physical random access channel (PRACH) detection units (PDUs), wherein the processor causes the communication node to perform:
• assigning preambles to a plurality of frequency domain occasions (FDOs), respectively;
• generating reconfiguration information including information on the preambles assigned to each of the plurality of FDOs;
• assigning a physical random access channel (PRACH) detection unit (PDU) to each preamble among the assigned preambles based on the reconfiguration information;
• generating a reference sequence for each of the assigned preambles based on information on the preambles assigned to each of the plurality of FDOs;
• generating matching information between each preamble index of the preambles assigned to each of the plurality of FDOs and a PDU index of a PDU assigned to each preamble corresponding to each preamble index, based on the reconfiguration information;
• and
• detecting a preamble assigned to each PDU from a fast Fourier transform (FFT) signal using the reference sequence and each PDU according to the matching information,
• wherein the reconfiguration information includes an FDO index for each FDO of the plurality of FDOs and preamble indexes of the preambles assigned to the each FDO.