The present invention related to a method and an arrangement for selecting an enhanced transport format combination used for maximizing power utilization efficiency and power limitation avoidance in a communication network system comprising a communication network entity communicating with a plurality of user equipments on uplink and downlink channels over a radio interface. A power consumption for an acknowledgement/negative acknowledgement transmission and a channel quality indicator transmission is determined on an uplink channel during an enhanced dedicated channel transmission. Thereby, a transport format combination is selected based on said determined power consumption.