A method comprising: acquiring, in a terminal device, a resource budget for transmittal of a channel measurement report to an access node; and performing, in the terminal device, channel measurements of a radio channel, characterized in that the resource budget defines a plurality of candidate transmission formats for the channel measurement report, wherein the plurality of candidate transmission formats differ from one another in at least one of the following characteristics: amount of transmission resources for reporting time domain characteristics of the radio channel, amount of transmission resources for reporting frequency domain characteristics of the radio channel, amount of transmission resources for reporting spatial domain characteristics of the radio channel, and a number of bits for quantizing contents of the channel measurement report, and characterized in that it further comprises: selecting, in the terminal device, a feedback scheme of the channel measurement report on the basis of a result of the channel measurements such that the channel measurement report complies with the resource budget, wherein selecting the feedback scheme comprises selecting for the content of the channel measurement report based on the result of the channel measurements at least one of: feedback granularity for reporting frequency domain characteristics of the radio channel, feedback granularity for reporting time domain characteristics of the radio channel, feedback granularity for reporting spatial domain characteristics of the radio channel, and feedback granularity for quantizing the content of the channel measurement report, and wherein selecting the feedback scheme comprises selecting a transmission format for the channel measurement report amongst the plurality of candidate transmission formats; and causing transmission of the channel measurement report according to the selected feedback scheme. acquiring, in a terminal device, a resource budget for transmittal of a channel measurement report to an access node; and performing, in the terminal device, channel measurements of a radio channel, characterized in that the resource budget defines a plurality of candidate transmission formats for the channel measurement report, wherein the plurality of candidate transmission formats differ from one another in at least one of the following characteristics: amount of transmission resources for reporting time domain characteristics of the radio channel, amount of transmission resources for reporting frequency domain characteristics of the radio channel, amount of transmission resources for reporting spatial domain characteristics of the radio channel, and a number of bits for quantizing contents of the channel measurement report, and characterized in that it further comprises: selecting, in the terminal device, a feedback scheme of the channel measurement report on the basis of a result of the channel measurements such that the channel measurement report complies with the resource budget, wherein selecting the feedback scheme comprises selecting for the content of the channel measurement report based on the result of the channel measurements at least one of: feedback granularity for reporting frequency domain characteristics of the radio channel, feedback granularity for reporting time domain characteristics of the radio channel, feedback granularity for reporting spatial domain characteristics of the radio channel, and feedback granularity for quantizing the content of the channel measurement report, and wherein selecting the feedback scheme comprises selecting a transmission format for the channel measurement report amongst the plurality of candidate transmission formats; and causing transmission of the channel measurement report according to the selected feedback scheme. feedback granularity for reporting frequency domain characteristics of the radio channel, feedback granularity for reporting time domain characteristics of the radio channel, feedback granularity for reporting spatial domain characteristics of the radio channel, and feedback granularity for quantizing the content of the channel measurement report, and wherein selecting the feedback scheme comprises selecting a transmission format for the channel measurement report amongst the plurality of candidate transmission formats; and causing transmission of the channel measurement report according to the selected feedback scheme.