Abase station for receiving channel state information, CSI, in a communication system, the base station comprising: a transceiver; and a controller connected with the transceiver and configured to: transmit, to a terminal via the transceiver, CSI configuration information including configuration on a first channel state information reference signal, CSI-RS, and a second CSI-RS and configuration for CSI feedback associated with the first CSI-RS and the second CSI-RS; transmit, to the terminal, the first CSI-RS and the second CSI-RS; and receive, from the terminal, the CSI including a rank indicator, RI, a precoding matrix indicator, PMI, and a channel quality indicator, CQI, wherein the CSI is defined for a first dimension and a second dimension, wherein the first CSI-RS and the second CSI-RS are non-zero power CSI-RSs, and are associated with the received CSI, wherein the CSI configuration information includes information on RI restriction for the first dimension and the second dimension, wherein a maximum RI value allowed to be reported is defined by the information on RI restriction, and wherein the PMI for the first dimension and the second dimension is based on the received RI, the received RI is based on the information on RI restriction. a transceiver; and a controller connected with the transceiver and configured to: transmit, to a terminal via the transceiver, CSI configuration information including configuration on a first channel state information reference signal, CSI-RS, and a second CSI-RS and configuration for CSI feedback associated with the first CSI-RS and the second CSI-RS; transmit, to the terminal, the first CSI-RS and the second CSI-RS; and receive, from the terminal, the CSI including a rank indicator, RI, a precoding matrix indicator, PMI, and a channel quality indicator, CQI, wherein the CSI is defined for a first dimension and a second dimension, wherein the first CSI-RS and the second CSI-RS are non-zero power CSI-RSs, and are associated with the received CSI, wherein the CSI configuration information includes information on RI restriction for the first dimension and the second dimension, wherein a maximum RI value allowed to be reported is defined by the information on RI restriction, and wherein the PMI for the first dimension and the second dimension is based on the received RI, the received RI is based on the information on RI restriction. transmit, to a terminal via the transceiver, CSI configuration information including configuration on a first channel state information reference signal, CSI-RS, and a second CSI-RS and configuration for CSI feedback associated with the first CSI-RS and the second CSI-RS; transmit, to the terminal, the first CSI-RS and the second CSI-RS; and receive, from the terminal, the CSI including a rank indicator, RI, a precoding matrix indicator, PMI, and a channel quality indicator, CQI, wherein the CSI is defined for a first dimension and a second dimension, wherein the first CSI-RS and the second CSI-RS are non-zero power CSI-RSs, and are associated with the received CSI, wherein the CSI configuration information includes information on RI restriction for the first dimension and the second dimension, wherein a maximum RI value allowed to be reported is defined by the information on RI restriction, and wherein the PMI for the first dimension and the second dimension is based on the received RI, the received RI is based on the information on RI restriction. <EOS>