A method for execution in a processor of a mobile communication device of a wireless communication network for improving a current position of the mobile communication device determined in the mobile communication device by means of a GPS receiver, comprising the following steps: a0) estimating, based on an accuracy included in a position information provided for a second communication device and an accuracy included in a position information provided for at least one further communication device, whether the current position of a first mobile communication device can be improved, a1) determining, for a specific validity time point, an observation value defining the relative location between the first mobile communication device (10; 190) and the second mobile communication device (20; 200), a2) determining for the specific validity time point a further observation value defining the relative location between the first mobile communication device (10; 190) and the at least one further mobile communication device (30, 40, 190, 210-250), and/or determining for the specific validity time point a further observation value defining the relative location between the second mobile communication device (20; 200) and the at least one further mobile communication device; b) providing a position information which specifies the position of the second communication device at the determined validity time point, the position information including information about the position coordinates and the accuracy thereof, and providing for the at least one further communication device (30, 40, 190, 210-250) a position information which specifies the position of the at least one further communication device (30, 40, 190, 210-250) for the specific validity time point, the position information including information about the position coordinates and the accuracy thereof; c) executing an optimization algorithm for estimating the position coordinates of the first mobile communication device and the accuracy of the position coordinates depending on the observation value determined in step a1), on the at least one further observation value determined in step a2), on the position information of the second communication device provided in step b) and on the position information of the at least one further communication device (30, 40, 190, 210-250) provided in step b), wherein the optimization algorithm is based on a free network adjustment, and performing a coordinate system transformation of the estimated position coordinates into another predefined target coordinate system, wherein the first, mobile communication device, the second communication device and the at least one further communication device (30, 40, 190, 210-250) form a temporary geometric location network. a0) estimating, based on an accuracy included in a position information provided for a second communication device and an accuracy included in a position information provided for at least one further communication device, whether the current position of a first mobile communication device can be improved, a1) determining, for a specific validity time point, an observation value defining the relative location between the first mobile communication device (10; 190) and the second mobile communication device (20; 200), a2) determining for the specific validity time point a further observation value defining the relative location between the first mobile communication device (10; 190) and the at least one further mobile communication device (30, 40, 190, 210-250), and/or determining for the specific validity time point a further observation value defining the relative location between the second mobile communication device (20; 200) and the at least one further mobile communication device; b) providing a position information which specifies the position of the second communication device at the determined validity time point, the position information including information about the position coordinates and the accuracy thereof, and providing for the at least one further communication device (30, 40, 190, 210-250) a position information which specifies the position of the at least one further communication device (30, 40, 190, 210-250) for the specific validity time point, the position information including information about the position coordinates and the accuracy thereof; c) executing an optimization algorithm for estimating the position coordinates of the first mobile communication device and the accuracy of the position coordinates depending on the observation value determined in step a1), on the at least one further observation value determined in step a2), on the position information of the second communication device provided in step b) and on the position information of the at least one further communication device (30, 40, 190, 210-250) provided in step b), wherein the optimization algorithm is based on a free network adjustment, and performing a coordinate system transformation of the estimated position coordinates into another predefined target coordinate system, wherein the first, mobile communication device, the second communication device and the at least one further communication device (30, 40, 190, 210-250) form a temporary geometric location network.