Method of performing cell search in wireless communication system

A device comprising:

• a processor;
• and
• a memory operatively coupled with the processor and storing instructions that when executed by the processor causes the device to:
• receive a primary synchronization code (PSC);
• receive a first secondary synchronization signal comprising a first sequence and a second sequence;
• receive a second secondary synchronization signal comprising the first sequence and the second sequence;
• and
• determine a cell identity based on the PSC, the first secondary synchronization signal and the second secondary synchronization signal,
• wherein the first sequence of the first secondary synchronization signal is scrambled by using a first scrambling code, the second sequence of the first secondary synchronization signal is scrambled by using a second scrambling code, the first sequence of the second secondary synchronization signal is scrambled by using the second scrambling code, and the second sequence of the second secondary synchronization signal is scrambled by using the first scrambling code,
• wherein the first scrambling code and the second scrambling code are associated with the PSC, and
• wherein the first and second scrambling codes are defined by using a first polynomial x5+x3+1 and the first and second sequences are defined by m-sequences generated by using a second polynomial x5+x2+1.

A method for a wireless communication system, performed by a user equipment, the method comprising:

• searching for a primary synchronization code (PSC);
• searching for a first secondary synchronization signal comprising a first sequence and a second sequence;
• searching for a second secondary synchronization signal comprising the first sequence and the second sequence;
• and
• determining a cell identity based on the PSC, the first secondary synchronization signal and the second secondary synchronization signal,
• wherein the first sequence of the first secondary synchronization signal is scrambled by using a first scrambling code, the second sequence of the first secondary synchronization signal is scrambled by using a second scrambling code, the first sequence of the second secondary synchronization signal is scrambled by using the second scrambling code, and the second sequence of the second secondary synchronization signal is scrambled by using the first scrambling code,
• wherein the first scrambling code and the second scrambling code are associated with the PSC, and
• wherein the first and second scrambling codes are defined by using a first polynomial x5+x3+1 and the first and second sequences are defined by m-sequences generated by using a second polynomial x5+x2+1.

A device comprising:

• a processor;
• and
• a memory operatively coupled with the processor and storing instructions that when executed by the processor causes the device to:
• search for a primary synchronization code (PSC);
• search for a first secondary synchronization signal comprising a first sequence and a second sequence;
• search for a second secondary synchronization signal comprising the first sequence and the second sequence;
• and
• determining a cell identity based on the PSC, the first secondary synchronization signal and the second secondary synchronization signal,
• wherein the first sequence of the first secondary synchronization signal is scrambled by using a first scrambling code, the second sequence of the first secondary synchronization signal is scrambled by using a second scrambling code, the first sequence of the second secondary synchronization signal is scrambled by using the second scrambling code, and the second sequence of the second secondary synchronization signal is scrambled by using the first scrambling code,
• wherein the first scrambling code and the second scrambling code are associated with the PSC, and
• wherein the first and second scrambling codes are defined by using a first polynomial x5+x3+1 and the first and second sequences are defined by m-sequences generated by using a second polynomial x5+x2+1.

A method for a wireless communication system, performed by a user equipment, the method comprising:

• searching for a primary synchronization signal comprising a primary synchronization code (PSC);
• searching for a first secondary synchronization signal comprising a first secondary synchronization code (SSC) and a second SSC;
• and
• searching for a second secondary synchronization signal comprising the first SSC and the second SSC,
• wherein the first SSC of the first secondary synchronization signal is scrambled using a first scrambling code, the second SSC of the first secondary synchronization signal is scrambled using a second scrambling code, the first SSC of the second secondary synchronization signal is scrambled using the second scrambling code, and the second SSC of the second synchronization signal is scrambled using the first scrambling code, and
• wherein the first scrambling code and the second scrambling code are associated with the PSC.

A device comprising:

• a processor;
• and
• a memory operatively coupled with the processor and storing instructions that when executed by the processor causes the device to:
• search for a primary synchronization signal comprising a primary synchronization code (PSC);
• search for a first secondary synchronization signal comprising a first secondary synchronization code (SSC) and a second SSC;
• and
• search for a second secondary synchronization signal comprising the first SSC and the second SSC,
• wherein the first SSC of the first secondary synchronization signal is scrambled using a first scrambling code, the second SSC of the first secondary synchronization signal is scrambled using a second scrambling code, the first SSC of the second secondary synchronization signal is scrambled using the second scrambling code, and the second SSC of the second synchronization signal is scrambled using the first scrambling code, and
• wherein the first scrambling code and the second scrambling code are associated with the PSC.