Abstract: Method and device for controlling a system state of a stationary system affected by delays as a function of a variable geoposition of a person, wherein the system is to have reached a predefined presence state when the person arrives at the location of the system. The method comprises: determining the geoposition of the person; estimating the time period needed by the person from the determined geoposition until arrival at the location of the system; and specifying a reference state for changing the current system state, wherein the reference state for reaching the presence state within the estimated time period is determined as a function of the predefined presence state, the performance capability of the system and the estimated time period. The device comprises similarly designed means for determining the geoposition, estimating the time period and specifying the reference state.