The disclosure relates to a method (200) performed by a control system (2, 3, 4) that controls the usage of a first carrier, which first carrier is divided into transmission segments and each transmission segment consisting of N transmission time intervals, where N is greater than or equal to 2. The method (200) comprises the control system (2, 3, 4): configuring (202) a first wireless communication device UE1 to transmit data on a physical traffic channel using the first carrier by transmitting the data only during a first subset of the N transmission time intervals in each transmission segment, wherein the first subset of the N transmission time intervals consists of n transmission time intervals and n