A terminal for FD-MIMO wireless communication system, the terminal comprising: at least one transceiver; and at least one processor coupled to the at least one transceiver, wherein the at least one transceiver is configured to: receive, via a radio resource control, RRC, signaling, information regarding a configuration comprising a type of channel state information, CSI,-reference signal, RS, in a set of subframes wherein the type of CSI-RS is one of a beamformed CSI-RS in a second set of subframes and a non-precoded CSI-RS in a first set of subframes; and transmit a CSI report on an uplink channel based on the type of CSI-RS, wherein the CSI report includes one precoding matrix indicator, PMI, value indicating one of a plurality of precoders in a codebook, in case that the type of CSI-RS is the beamformed CSI-RS in the second set of subframes, and wherein each of the plurality of precoders in the codebook represents a pair of antenna ports and a co-phasing between the antenna ports, and wherein the CSI report includes two first codebook indices corresponding to a first precoding stage and one second codebook index corresponding to a second precoding stage, in case that the type of CSI-RS is the non-precoded CSI-RS in the first set of subframes. at least one transceiver; and at least one processor coupled to the at least one transceiver, wherein the at least one transceiver is configured to: receive, via a radio resource control, RRC, signaling, information regarding a configuration comprising a type of channel state information, CSI,-reference signal, RS, in a set of subframes wherein the type of CSI-RS is one of a beamformed CSI-RS in a second set of subframes and a non-precoded CSI-RS in a first set of subframes; and transmit a CSI report on an uplink channel based on the type of CSI-RS, wherein the CSI report includes one precoding matrix indicator, PMI, value indicating one of a plurality of precoders in a codebook, in case that the type of CSI-RS is the beamformed CSI-RS in the second set of subframes, and wherein each of the plurality of precoders in the codebook represents a pair of antenna ports and a co-phasing between the antenna ports, and wherein the CSI report includes two first codebook indices corresponding to a first precoding stage and one second codebook index corresponding to a second precoding stage, in case that the type of CSI-RS is the non-precoded CSI-RS in the first set of subframes. receive, via a radio resource control, RRC, signaling, information regarding a configuration comprising a type of channel state information, CSI,-reference signal, RS, in a set of subframes wherein the type of CSI-RS is one of a beamformed CSI-RS in a second set of subframes and a non-precoded CSI-RS in a first set of subframes; and transmit a CSI report on an uplink channel based on the type of CSI-RS, wherein the CSI report includes one precoding matrix indicator, PMI, value indicating one of a plurality of precoders in a codebook, in case that the type of CSI-RS is the beamformed CSI-RS in the second set of subframes, and wherein each of the plurality of precoders in the codebook represents a pair of antenna ports and a co-phasing between the antenna ports, and wherein the CSI report includes two first codebook indices corresponding to a first precoding stage and one second codebook index corresponding to a second precoding stage, in case that the type of CSI-RS is the non-precoded CSI-RS in the first set of subframes. <EOS>