A method performed by a serving network node (300, 400) for determining a transmission parameter to be used for a transmission to a wireless device, the method comprising: - obtaining path gain information relating to the wireless device, or downlink received power relating to at least one Cell-specific Reference Signal, CRS, transmitted by at least the serving network node (300, 400), wherein obtaining the path gain information comprises receiving power measurements made in respective network nodes on an uplink Sounding Reference Signal, SRS, transmitted from the wireless device, wherein network nodes having the measured power above a threshold are interferers to the wireless device, - obtaining load information of the network nodes having the measured power above the threshold that are interferers to the wireless device, - receiving a Channel State Information, CSI, report from the wireless device, - determining a Channel Quality Indicator, CQI, offset based on the obtained path gain information or the downlink received power; and the obtained load information of the interferers to the wireless device, wherein the CQI offset is determined as the difference between a Signal to Interference and Noise Ratio, SINR, for a data signal and an SINR for a CRS, and wherein the SINR for the data signal, and the SINR for the CRS are determined based on the obtained downlink received power, and - determining the transmission parameter to be used for the transmission to the wireless device based on the reported CSI and determined CQI offset. - obtaining path gain information relating to the wireless device, or downlink received power relating to at least one Cell-specific Reference Signal, CRS, transmitted by at least the serving network node (300, 400), wherein obtaining the path gain information comprises receiving power measurements made in respective network nodes on an uplink Sounding Reference Signal, SRS, transmitted from the wireless device, wherein network nodes having the measured power above a threshold are interferers to the wireless device, - obtaining load information of the network nodes having the measured power above the threshold that are interferers to the wireless device, - receiving a Channel State Information, CSI, report from the wireless device, - determining a Channel Quality Indicator, CQI, offset based on the obtained path gain information or the downlink received power; and the obtained load information of the interferers to the wireless device, wherein the CQI offset is determined as the difference between a Signal to Interference and Noise Ratio, SINR, for a data signal and an SINR for a CRS, and wherein the SINR for the data signal, and the SINR for the CRS are determined based on the obtained downlink received power, and wherein the CQI offset is determined as the difference between a Signal to Interference and Noise Ratio, SINR, for a data signal and an SINR for a CRS, and wherein the SINR for the data signal, and the SINR for the CRS are determined based on the obtained downlink received power, and - determining the transmission parameter to be used for the transmission to the wireless device based on the reported CSI and determined CQI offset.