Method for configuring a cellular network comprising a plurality of network cells, the method comprising: - monitoring, during a monitoring time period, a performance indicator of each network cell for each one of a plurality of monitoring time intervals of said monitoring time period; - determining a plurality of sets of measured signal levels, wherein each set of measured signal levels is associated with a respective territorial portion of a geographic area covered by the cellular network, and wherein each measured signal level of each set of measured signal levels is associated with a respective measured network cell, among the plurality of network cells, at least partially within that territorial portion, with a respective cell configuration of said measured network cell, and with a respective monitoring time interval, and - determining, for each measured network cell, a simulated signal level being indicative of an expected signal level for that measured network cell in the respective cell configuration, characterized by further comprising - determining, for each measured network cell and for each monitoring time interval, a signal level deviation as a difference between the respective measured signal level and the respective simulated signal level; - for a reference network configuration, RNC1, including, for each measured network cell, a respective reference cell configuration taken by that measured network cell after the monitoring time period: i) determining, for each measured network cell, a reference simulated signal level indicative of an expected signal level for that measured network cell in the reference cell configuration; ii) updating, for each monitoring time interval, each measured signal level according to the respective simulated signal level and to the respective signal level deviation; iii) determining, for each measured network cell and for each monitoring time interval, an estimated performance indicator based on the respective performance indicator, on a number of sets of measured signal levels having at least one measured signal level associated with said measured network cell, and on the respective updated measured signal level, and - configuring the cellular network according to the estimated performance indicators determined for the measured network cells. - monitoring, during a monitoring time period, a performance indicator of each network cell for each one of a plurality of monitoring time intervals of said monitoring time period; - determining a plurality of sets of measured signal levels, wherein each set of measured signal levels is associated with a respective territorial portion of a geographic area covered by the cellular network, and wherein each measured signal level of each set of measured signal levels is associated with a respective measured network cell, among the plurality of network cells, at least partially within that territorial portion, with a respective cell configuration of said measured network cell, and with a respective monitoring time interval, and - determining, for each measured network cell, a simulated signal level being indicative of an expected signal level for that measured network cell in the respective cell configuration, characterized by further comprising - determining, for each measured network cell and for each monitoring time interval, a signal level deviation as a difference between the respective measured signal level and the respective simulated signal level; - for a reference network configuration, RNC1, including, for each measured network cell, a respective reference cell configuration taken by that measured network cell after the monitoring time period: i) determining, for each measured network cell, a reference simulated signal level indicative of an expected signal level for that measured network cell in the reference cell configuration; ii) updating, for each monitoring time interval, each measured signal level according to the respective simulated signal level and to the respective signal level deviation; iii) determining, for each measured network cell and for each monitoring time interval, an estimated performance indicator based on the respective performance indicator, on a number of sets of measured signal levels having at least one measured signal level associated with said measured network cell, and on the respective updated measured signal level, and i) determining, for each measured network cell, a reference simulated signal level indicative of an expected signal level for that measured network cell in the reference cell configuration; ii) updating, for each monitoring time interval, each measured signal level according to the respective simulated signal level and to the respective signal level deviation; iii) determining, for each measured network cell and for each monitoring time interval, an estimated performance indicator based on the respective performance indicator, on a number of sets of measured signal levels having at least one measured signal level associated with said measured network cell, and on the respective updated measured signal level, and - configuring the cellular network according to the estimated performance indicators determined for the measured network cells.