Patent ID: 8884817
Filing Date: 2014-11-11
Classification: G01S

Abstract:
1. A method for updating location data of a first mobile Satellite Positioning System (SPS) enabled device comprising: determining a need for updating stored location data for the first mobile SPS enabled device based on an age of the stored location data; establishing an ad-hoc short range wireless network with other mobile SPS enabled devices; receiving an age of more recent location data in at least one of the other mobile SPS enabled devices using a connection between the first mobile SPS enabled device and the at least one other mobile SPS enabled device in the ad-hoc short range wireless network; determining a difference between the age of the stored location data in the first mobile SPS enabled device with the age of more recent location data in the at least one of the other mobile SPS enabled devices; comparing the difference to a predetermined threshold value; further comparing both the age of the location data for the at least one other mobile SPS enabled device and the age of the stored location data for the first mobile SPS enabled device to a predetermined age threshold value; and after performing the comparing and further comparing steps, receiving the more recent location data from the at least one other mobile SPS enabled device to update the stored location data of the first mobile SPS enabled device by replacing it with the more recent location data only if the difference exceeds the predetermined threshold value and further depending on the results of the further comparison to the predetermined age threshold value.