Control apparatus and method for controlling data traffic in a vehicle, and vehicle system

A control apparatus (100) for controlling data traffic, which is generated by functional units (105, 110) of a vehicle (115), via a radio device (120) comprises a functional interface (125) for connecting the control apparatus (100) to functional units (105, 110) and for reading in requirement signals (130, 135) representing requirements of the functional units (105, 110) in terms of a capacity required in future for the data traffic for transmitting functional data. The control apparatus (100) also comprises a transmission interface (140) for connecting the control apparatus (100) to the radio device (120) and a determination device (160) which is designed to use a route signal (145), a network signal (150) and the requirement signals (130, 135) to determine capacity signals (165, 170) representing partial capacities available in future for the functional units (105, 110).