Patent ID: 8559351

Claim:
A method performed by a first base station for using a dedicated reference signal for supporting Coordinated MultiPoint transmission, comprising: communicating with a second base station to coordinate a data transmission to a first user device from the first base station and the second base station; applying a cluster-specific scrambling to a first data modulation symbol and to a first pilot modulation symbol; transmitting, in a first direction, the scrambled first data modulation symbol of the data transmission from the first base station such that transmission of the scrambled first data modulation symbol is coordinated with a transmission of the scrambled first data modulation symbol by the second base station in a second direction; and transmitting, in the first direction, the scrambled first pilot modulation symbol from the first base station such that transmission of the scrambled first pilot modulation symbol is coordinated with a transmission of the scrambled first pilot modulation symbol by the second base station in the second direction.