A communication system for air traffic control is described. The communication system includes a cloud based server structure, at least one controller working position as well as at least one radio ground station for transmitting radio signals to an aircraft and/or receiving radio signals from an aircraft. The at least one radio ground station and the at least one controller working position are connected to the cloud based server structure by means of an internet protocol infrastructure. The cloud based server structure is configured to process signals for air-ground communication and/or ground-ground communication. Furthermore, a method of controlling air traffic of an airspace is described.