LOCATION METHOD AND SYSTEM AND LOCATABLE PORTABLE DEVICE

摘要

Location method for locating a portable device (1) from a server (2) configured to communicate with said portable device (1) through a wireless communications network (3), in which said portable device (1) comprises a transmission/receiving module (12), an A-GPS positioning module (11) and a microprocessor (15) configured to manage said modules (11, 12), in which the method comprises the steps of: sending GPS assistance information from the server (2) to the portable device (1) through said wireless communications network (3); obtaining in an A-GPS positioning module (11) of the portable device (1) a GPS signal (4) from a satellite system (8); calculating in said portable device (1) a location of the device (1) itself from said GPS signal (4) and from the GPS assistance information sent by the server (2); sending said location to the server (2) from the transmission/receiving module (12) through said wireless communications network (3). It also comprises the steps of: when the portable device is stopped, hibernating the A-GPS positioning module and the microprocessor, maintaining the transmission/receiving module turned on; and when the portable device is in an area in which it is receiving service from said wireless communications network from a cell recognized by said device and stored in a memory thereof, turning off the A-GPS positioning module, such that the server can provide position information associated to said area without having to interrogate the device, thus saving the battery and increasing the autonomy of the portable device.