A method performed by a server which is part of an operations support system, OSS, for a self-organizing network, SON, the method comprising: receiving, by the server, signal quality data for user devices of the SON that each communicate wirelessly with at least one base station in a set of base stations of the SON, the signal quality data indicating signal reception quality levels for the user devices for a plurality of times, the signal quality data comprising signal quality reports that indicate signal-to-interference-plus-noise ratio, SINR, information; receiving, by the server, transmission power data indicating transmission power levels of the base stations at the plurality of times; based on the signal quality data and the transmission power data, determining, by the server, observations for the user devices for different times corresponding to different combinations of the transmission power levels and SINR information; estimating, by the server, channel attenuation levels for wireless communication channels between the user devices and the base stations based on different combinations of transmission power levels of the base stations and SINR information of the user devices in the observations, wherein estimating the channel attenuation levels comprises: generating, for a first user device of the user devices, a first matrix indicating relationships between SINR information of the first user device and the different combinations of transmission power levels of the base stations over a particular time period; and using the first matrix to estimate values of a second matrix, wherein the values represent path losses indicating channel attenuation of the first user device with respect to different base stations in the set of base stations; and providing, by the server, operating parameters to one or more of the base stations based on the estimated channel attenuation levels. receiving, by the server, signal quality data for user devices of the SON that each communicate wirelessly with at least one base station in a set of base stations of the SON, the signal quality data indicating signal reception quality levels for the user devices for a plurality of times, the signal quality data comprising signal quality reports that indicate signal-to-interference-plus-noise ratio, SINR, information; receiving, by the server, transmission power data indicating transmission power levels of the base stations at the plurality of times; based on the signal quality data and the transmission power data, determining, by the server, observations for the user devices for different times corresponding to different combinations of the transmission power levels and SINR information; estimating, by the server, channel attenuation levels for wireless communication channels between the user devices and the base stations based on different combinations of transmission power levels of the base stations and SINR information of the user devices in the observations, wherein estimating the channel attenuation levels comprises: generating, for a first user device of the user devices, a first matrix indicating relationships between SINR information of the first user device and the different combinations of transmission power levels of the base stations over a particular time period; and using the first matrix to estimate values of a second matrix, wherein the values represent path losses indicating channel attenuation of the first user device with respect to different base stations in the set of base stations; and generating, for a first user device of the user devices, a first matrix indicating relationships between SINR information of the first user device and the different combinations of transmission power levels of the base stations over a particular time period; and using the first matrix to estimate values of a second matrix, wherein the values represent path losses indicating channel attenuation of the first user device with respect to different base stations in the set of base stations; and providing, by the server, operating parameters to one or more of the base stations based on the estimated channel attenuation levels.