Communication of synchronization signals between base station and terminal

A method for receiving synchronization signals at a terminal, the method comprising:

• receiving a primary synchronization signal at a last symbol of a specific time domain unit from a base station;
• and
• receiving a secondary synchronization signal informing a cell group ID at a second-to-last symbol of the specific time domain unit from the base station,
• wherein the primary synchronization signal is generated using a Constant Amplitude Zero Auto-Correlation (CAZAC) sequence having a root index M and having a length L,
• wherein the root index M is one among a root index set comprising m0 and m1 meeting
• m0+m1=(½*L)*n
• or
• m0−m1=±(½*L)*n, and
• wherein n is an integer greater than 0.

A base station for transmitting synchronization signals, the base station comprising:

• a processor for acquiring a primary synchronization signal generated using a Constant Amplitude Zero Auto-Correlation (CAZAC) sequence having a root index M and having a length L, and a secondary synchronization signal informing a cell group ID,
• a transmitter for transmitting the primary synchronization signal at a last symbol of a specific time domain unit, and the secondary synchronization signal at a second-to-last symbol of the specific time domain unit, to the one or more terminals,
• wherein the root index M is one among a root index set comprising m0 and m1 meeting
• m0+m1=(½*L)*n
• or
• m0−m1=±(½*L)*n, and
• wherein n is an integer greater than 0.

A terminal for receiving synchronization signals, the terminal comprising:

• a receiver for receiving a primary synchronization signal at a last symbol of a specific time domain unit, and a secondary synchronization signal informing a cell group ID at a second-to-last symbol of the specific time domain unit from the base station,
• wherein the primary synchronization signal is generated using a Constant Amplitude Zero Auto-Correlation (CAZAC) sequence having a root index M and having a length L,
• wherein the root index M is one among a root index set comprising m0 and m1 meeting
• m0+m1=(½*L)*n
• or
• m0−m1=±(½*L)*n, and
• wherein n is an integer greater than 0.