Patent ID: 8483165

Claim:
A method for transmitting a reference signal in a wireless communication system, the method comprising: transmitting by a first base station a first reference signal to a user equipment by mapping the first reference signal to a resource region; and transmitting by a second base station a second reference signal to the user equipment by mapping the second reference signal to the resource region, wherein resource elements to which the first reference signal and the second reference signal are mapped in the resource region are determined in accordance with an index on a Latin square matrix occupied by two different elements from among N elements constituting the Latin square matrix with a size of N×N, wherein a frequency index k of a resource element to which the first reference signal or the second reference signal is mapped is determined by: k n m =mod(mod( a m ·b+c,N p )+ d,N ), wherein: m is an index of a cell identifier (ID) or a cell ID index obtained by considering a reuse factor; n is an orthogonal frequency division multiplexing (OFDM) symbol index of a resource element for transmitting the first reference signal or the second reference signal; a m is a function of the index of the cell ID or a function of the reuse factor; b, c, d, and Np are any integers; and mod(x,y) is a remainder obtained by dividing x by y.