1. Method 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 comprising: 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, wherein estimating the time period includes: determining whether the determined geoposition of the person coincides with one of a plurality of stored geoposition locations, wherein for a plurality of geoposition locations, at least one leaving time is respectively saved, and for some of the plurality of geoposition locations, a respective plurality of leaving times is saved, wherein for the some of the plurality of geoposition locations, each of the respective plurality of leaving times is a point in time, if the determined geoposition of the person coincides with one of the plurality of stored geoposition locations: calculating a waiting time from a current clock time until a next leaving time stored for the one of the plurality of stored geoposition locations, if the determined geoposition of the person does not coincide with one of the plurality of stored geoposition locations: determining a journey duration between the determined geoposition of the person and the location of the system, wherein the estimation of the journey duration is realised by applying a navigation/routing algorithm, and calculating the time period needed by the person until arrival at the location of the system using the waiting time; 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; setting the system state of the stationary system to the reference state; and controlling the stationary system based on the reference state.