Terminal and method for performing cell search in wireless communication system

An operating method of a terminal in a wireless communication system including a cell and the terminal, the operating method comprising:

• receiving an external signal from the cell through one selected transmission beam selected from among a plurality of transmission beams, the external signal having a synchronization signal block (SSB) including a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH);
• obtaining a cell identification number of the cell by using the PSS and the SSS;
• selecting a first candidate index among a first plurality of candidate indexes of the SSB as indicating the selected transmission beam based on a first amount of correlation between the external signal and a first internal signal of the terminal;
• and
• performing decoding on the PBCH using the first candidate index.

A terminal for performing communication with a cell, the terminal comprising:

• a plurality of antennas configured to form a plurality of reception beams for receiving an external signal from the cell through one selected transmission beam selected from among a plurality of transmission beams, the external signal having a synchronization signal block (SSB) including a primary synchronization signal (PSS), a secondary synchronization signal (SSS) and a physical broadcast channel (PBCH);
• and
• processing circuitry configured to,
• obtain a cell identification number of the cell by using the PSS and the SSS,
• determine a plurality of decoding priorities of a plurality of candidate indexes of the SSB, and
• perform decoding on the PBCH based on the plurality of decoding priorities.