Methods, systems, and devices for configuring channel state information (CSI) reference signals (RS) in mobile communication technology are described. An example method for wireless communication includes transmitting, by a network node to a wireless device, a configuration of at least one CSI-RS and a configuration of a CSI report, transmitting, based on the configuration over one or more CSI-RS resources, the at least one CSI-RS, and receiving, from the wireless device, the CSI report based on the configuration of the CSI report. The configuration of the CSI report may comprise one or more of the following: a number of CSI-RS ports related to a specific number of frequency basis vectors, or an index of a frequency basis vector corresponding to the specific number.