Method for generating downlink frame, and method for searching cell

A method for searching a cell in a terminal, comprising:

• receiving a downlink frame including a primary synchronization signal and a secondary synchronization signal;
• and
• determining a cell group to which a terminal belongs, by using the secondary synchronization signal,
• wherein in the secondary synchronization signal, a first sequence scrambled with a first scrambling sequence and a second sequence scrambled with a second scrambling sequence are mapped to a frequency domain, and
• the first scrambling sequence and the second scrambling sequence are mapped to a sequence number of the primary synchronization signal.

An apparatus for searching a cell, comprising:

• a receiving antenna that receives a downlink frame including a primary synchronization signal and a secondary synchronization signal;
• and
• a cell searcher that identifies a cell group to which the terminal belongs, from the secondary synchronization signal,
• wherein in the secondary synchronization signal, a first sequence scrambled with a first scrambling sequence and a second sequence scrambled with a second scrambling sequence are mapped to a frequency domain, and
• the first scrambling sequence and the second scrambling sequence are mapped to a sequence number of the primary synchronization signal.