A method of wireless communication between a scheduling entity and a set of one or more scheduled entities in a wireless communication network, the method comprising, at the scheduling entity: configuring a plurality of channel state information reference signal, CSI-RS, resources , each identifying a set of one more resource elements on which to transmit a CSI-RS and a set of one or more ports from which to transmit the CSI-RS; for each of the plurality of CSI-RS resources, configuring a set of one or more port groups , each identifying a group of ports within the respective set of ports associated with a channel; selecting a CSI-RS resource from the plurality of CSI-RS resources and a port group from the set of one or more port groups of the CSI-RS resource for a scheduled entity of the set of one or more scheduled entities , transmitting an indication of the CSI-RS resource and a port group indication of the port group, wherein the port group comprises X ports and comprises a group of ports K within the set of one or more ports of the CSI-RS resource on which to perform channel estimation of a channel, to the scheduled entity ; transmitting the CSI-RS to the scheduled entity utilizing the set of one or more resource elements and the set of one or more ports associated with the CSI-RS resource ; receiving channel state information, CSI, from the scheduled entity measured on the group of ports comprising the K ports, wherein K < X, indicated by the port group ; and receiving a non-zero-power, NZP, interference measurement from the scheduled entity measured on the remaining (X - K) ports within the set of ports not assigned to the scheduled entity outside of the group of ports . configuring a plurality of channel state information reference signal, CSI-RS, resources , each identifying a set of one more resource elements on which to transmit a CSI-RS and a set of one or more ports from which to transmit the CSI-RS; for each of the plurality of CSI-RS resources, configuring a set of one or more port groups , each identifying a group of ports within the respective set of ports associated with a channel; selecting a CSI-RS resource from the plurality of CSI-RS resources and a port group from the set of one or more port groups of the CSI-RS resource for a scheduled entity of the set of one or more scheduled entities , transmitting an indication of the CSI-RS resource and a port group indication of the port group, wherein the port group comprises X ports and comprises a group of ports K within the set of one or more ports of the CSI-RS resource on which to perform channel estimation of a channel, to the scheduled entity ; transmitting the CSI-RS to the scheduled entity utilizing the set of one or more resource elements and the set of one or more ports associated with the CSI-RS resource ; receiving channel state information, CSI, from the scheduled entity measured on the group of ports comprising the K ports, wherein K < X, indicated by the port group ; and receiving a non-zero-power, NZP, interference measurement from the scheduled entity measured on the remaining (X - K) ports within the set of ports not assigned to the scheduled entity outside of the group of ports . <EOS>