Patent ID: 8619693

Claim:
A method for transmitting, by a base station, a reference signal for channel measurement to at least one user equipment, the method comprising: transmitting, to a user equipment (UE), first resource configuration information indicating a first time-frequency resource for carrying the reference signal in a first subset of a plurality of subframes, first subframe configuration information indicating a transmission period for the first subset of the plurality of subframes, second resource configuration information indicating a second time-frequency resource having zero transmission power in a second subset of the plurality of subframes, and second subframe configuration information indicating a zero transmission power period for the second subset of the plurality of subframes; and transmitting, to the UE, the reference signal in the first time-frequency resource based on the first resource configuration information and the first subframe configuration information and setting power to zero in the second time-frequency resource based on the second resource configuration information and the second subframe configuration information, wherein each subframe of the first subset of the plurality of subframes and the second subset of the plurality of subframes is comprised of two slots identified as slot 0 and slot 1 , each of which includes 7 orthogonal frequency division multiplexing (OFDM) symbols identified as OFDM symbols 0 to 6 , wherein the first time-frequency resource is within two OFDM symbols in the first subset of the plurality of subframes, and wherein the two OFDM symbols are other than OFDM symbols 0 , 1 , 2 and 4 of the slot 0 and OFDM symbols 0 , 1 and 4 of the slot 1 .