Patent ID: 8798011

Claim:
A method implemented in a user equipment configured to be used in a multi-user (MU) multiple-input multiple-output (MIMO) wireless communications system, the method comprising: transmitting to a base station a first channel state information (CSI) report determined according to a single-user (SU) MIMO rule; transmitting to the base station a second CSI report determined according to an MU-MIMO rule; assuming a particular number of columns in U 1 ; and assuming either a substantially equal power per scheduled stream or a non-uniform power allocation in which a first fraction of energy per resource element (EPRE) is shared substantially equally among one or more columns of U 1 with a second fraction of the EPRE being shared substantially equally among one or more columns in U 1 , where U 1 and U 1 represent precoding matrices used by the base station to transmit data to the user equipment and a co-scheduled user equipment, respectively.