A method performed by a wireless device for applying a Channel State Information, CSI, filtering in a wireless communication network, the method comprising: - determining (502, 503), a recommended CSI filtering based on measurements of one or more received reference signals from a radio network node, and an update rate of a CSI reporting to the radio network node; - transmitting (504, 505), to the radio network node, a first indication of the determined recommended CSI filtering, and a second indication of the determined update rate; - receiving, from the radio network node or another radio network node, a first configuration of CSI filtering; and - using, the received first configuration for applying CSI filtering, characterized in that: determining (502, 503) the recommended CSI filtering and the update rate comprises determining the update rate of the CSI reporting to a maximal value such that a performance loss sum is less or equal to what is achieved with a minimum update rate plus an offset, for a time-filtering parameter α = 0, and then determining the recommended CSI filtering to a time filtering that minimizes the performance loss sum assuming the maximal value of the determined update rate, and wherein the performance loss sum between time t i and time t j is defined by a sum of a measure of performance losses at times t k by using a DL beamforming matrix at the radio network node obtained at time t i from a time-filtering of channel covariance matrices up to time t i using a time-filtering parameter value α, where t i ≤ t k ≤ t j for i < j and t j ≥ t i plus the update rate. - determining (502, 503), a recommended CSI filtering based on measurements of one or more received reference signals from a radio network node, and an update rate of a CSI reporting to the radio network node; - transmitting (504, 505), to the radio network node, a first indication of the determined recommended CSI filtering, and a second indication of the determined update rate; - receiving, from the radio network node or another radio network node, a first configuration of CSI filtering; and - using, the received first configuration for applying CSI filtering, characterized in that: determining (502, 503) the recommended CSI filtering and the update rate comprises determining the update rate of the CSI reporting to a maximal value such that a performance loss sum is less or equal to what is achieved with a minimum update rate plus an offset, for a time-filtering parameter α = 0, and then determining the recommended CSI filtering to a time filtering that minimizes the performance loss sum assuming the maximal value of the determined update rate, and wherein the performance loss sum between time t i and time t j is defined by a sum of a measure of performance losses at times t k by using a DL beamforming matrix at the radio network node obtained at time t i from a time-filtering of channel covariance matrices up to time t i using a time-filtering parameter value α, where t i ≤ t k ≤ t j for i < j and t j ≥ t i plus the update rate. determining (502, 503) the recommended CSI filtering and the update rate comprises determining the update rate of the CSI reporting to a maximal value such that a performance loss sum is less or equal to what is achieved with a minimum update rate plus an offset, for a time-filtering parameter α = 0, and then determining the recommended CSI filtering to a time filtering that minimizes the performance loss sum assuming the maximal value of the determined update rate, and wherein the performance loss sum between time t i and time t j is defined by a sum of a measure of performance losses at times t k by using a DL beamforming matrix at the radio network node obtained at time t i from a time-filtering of channel covariance matrices up to time t i using a time-filtering parameter value α, where t i ≤ t k ≤ t j for i < j and t j ≥ t i plus the update rate.