A method for determining a configuration of a wireless telecommunications network, the configuration aiming at increasing a quality of signals received by a destination device of the wireless telecommunications network, the signals resulting from a plurality of complex modulation symbols transmitted on a same resource by respective source devices (101, 102, 103, 104) of the wireless telecommunications network, the method comprising the following steps: - a first obtaining step of obtaining an information identifying source devices for which a relay device of the wireless telecommunications network has to apply a pre-coding to respective complex modulation symbols or for which the relay device has to apply the pre-coding to respective estimates of said complex modulation symbols; - a second obtaining step of obtaining a first channel matrix G representing a transmission channel between the source devices and the destination device and a second channel matrix F representing a transmission channel between the relay device and the destination device; characterized in that it comprises: - a determining step of determining a pre-coding matrix PΔ r aiming at being used by the relay device for applying the pre-coding to be able to transmit pre-coded complex modulation symbols, on the same resource as the complex modulation symbols transmitted by the source devices, in order to increase the quality of signals received by the destination device, the pre-coding matrix being determined on the basis of the obtained information identifying source devices, of the first and second channel matrices and of a transmission power constraint applicable to the relay device, such that the destination device is able to determine estimates X̃ of the complex modulation symbols from complex modulation symbols Y received by the destination device as follows: X ̃ = G + FP Δ r † G + FP Δ r + 2 N 0 I N − 1 G + FP Δ r † Y wherein Δ r is a diagonal matrix with ones at positions corresponding to the obtained information identifying source devices and with zeros elsewhere, I N is an identity matrix, and N 0 is the variance of an additive white Gaussian noise; and in that said same resource is a same time and frequency resource and in that the information identifying source devices is obtained from the relay device and is an information identifying the source devices for which the relay device is able to decode said complex modulation symbols. - a first obtaining step of obtaining an information identifying source devices for which a relay device of the wireless telecommunications network has to apply a pre-coding to respective complex modulation symbols or for which the relay device has to apply the pre-coding to respective estimates of said complex modulation symbols; - a second obtaining step of obtaining a first channel matrix G representing a transmission channel between the source devices and the destination device and a second channel matrix F representing a transmission channel between the relay device and the destination device; - a determining step of determining a pre-coding matrix PΔ r aiming at being used by the relay device for applying the pre-coding to be able to transmit pre-coded complex modulation symbols, on the same resource as the complex modulation symbols transmitted by the source devices, in order to increase the quality of signals received by the destination device,