Patent ID: 8649347

Claim:
A method of arranging demodulation reference signals in a radio communication system that communicates according to a coordinated scheme, the demodulation reference signals and data being transmitted to a receiving terminal through time/frequency resources of the radio communication system using a resource block as a base unit, the method comprising: a step of arranging at least two orthogonal demodulation reference signals in two edge orthogonal frequency division multiplexing symbols located on one side of a time domain and the other side of the time domain respectively in data regions of resource blocks of respective cells, a frequency offset existing between cells at positions of the orthogonal demodulation reference signals in the edge orthogonal frequency division multiplexing symbols, and performing puncturing at positions corresponding to the orthogonal demodulation reference signals of the other cells in the edge orthogonal frequency division multiplexing symbols of the respective cells; and a step of arranging superimposing demodulation reference signals in the two edge orthogonal frequency division multiplexing symbols in a resource block of one cell and arranging the superimposing demodulation reference signals at positions corresponding to the resource blocks of the other cells, wherein: positions of the superimposing demodulation reference signals are set between the positions of the orthogonal demodulation reference signals in the respective edge orthogonal frequency division multiplexing symbols.