In data transmission between a mobile terminal and a cellular network, a network component, e.g., a base station, establishes a downlink connection from the cellular network to the mobile terminal. The downlink connection uses one or more downlink carriers. Further, the network component identifies multiple uplink carriers which are available for establishing an uplink connection from the mobile terminal to the cellular network. The network component estimates impact of usage of the uplink carriers on power consumption of the mobile terminal. Depending on the estimated impact, the network component selects at least one of the uplink carriers for establishing the uplink connection.