Accurate position capability can be quickly provided using a Wireless Local Area Network (WLAN). When associated with a WLAN, a wireless device can quickly determine its relative and/or coordinate position based on information provided by an access point in the WLAN. Before a wireless device disassociates with the access point, the WLAN can periodically provide time, location, and decoded GPS data to the wireless device. In this manner, the wireless device can significantly reduce the time to acquire the necessary GPS satellite data (i.e. on the order if seconds instead of minutes) to determine its coordinate position.

The present invention relates to devices and methods for determining a position of a mobile terminal with assistance from a wireless communication system. The mobile terminal is configured to receive a reference signal from a reference point of the wireless communication system, to receive positioning assistance information related to the reference point, and to determine its position based on the positioning assistance information and the reference signal.

Disclosed is a technology for increasing a positioning success rate and reducing a positioning error with high reliability by proposing an improved positioning scheme based on virtual satellites capable of improving DOP and removing an error in a satellite measurement value when a location of a terminal in an inadequate environment such as downtown/indoors near a window is measured.

Implementations relate to systems and methods for location assistance using devices (104) in a personal area network (PAN). In one scenario, a user may use two separate location-enabled devices, such as a wearable personal device (102) and a cellular telephone device (104). In cases, one of those devices may have reached a higher or farther-developed state in terms of generating or storing location information (108) for the user's current position, as compared to the opposite device. This can take place, for instance, when the first (e.g. wearable) device (102) is first turned on. The two devices use platforms and techniques to exchange location information and carry out GPS or other operations to furnish the device that is lagging in position processing progress with assistance which will speed up or otherwise enhance the position fix for that device.

A position detection system includes a GNSS sensor terminal that receives a satellite signal from a GNSS satellite as a snapshot, at least one relay device that receives the snapshot GNSS signal transmitted by the GNSS sensor terminal, and a calculation device that measures a position of the GNSS sensor terminal by using a code phase and a Doppler frequency of the GNSS satellite obtained from the snapshot GNSS signal, wherein the calculation device estimates an initial position of the GNSS sensor terminal by using position information of the relay device that has received the snapshot GNSS signal transmitted by the GNSS sensor terminal.

Accurate position capability can be quickly provided using a Wireless Local Area Network (WLAN). When associated with a WLAN, a wireless device can quickly determine its relative and/or coordinate position based on information provided by an access point in the WLAN. Before a wireless device disassociates with the access point, the WLAN can periodically provide time, location, and decoded GPS data to the wireless device. In this manner, the wireless device can significantly reduce the time to acquire the necessary GPS satellite data (i.e. on the order if seconds instead of minutes) to determine its coordinate position.

Disclosed are a system, apparatus, and method for estimating an absolute time. A mobile device receives a first timing signal of a terrestrial base station. The mobile device obtains a first timing offset, wherein the first timing offset is a transmit time bias between the first timing signal and an absolute Global Navigation Satellite System (GNSS) time, and the mobile device receives a maximum serving distance of the terrestrial base station. The mobile device estimates the absolute GNSS time based on the first timing signal, the first timing offset, and the maximum serving distance of the terrestrial base station.

A system includes a memory and a processor. The memory is configured to store map data indicating positions of landmarks. The processor is configured to receive image data from an image sensor. The processor is also configured to determine, based on the image data, a first estimate of a position, relative to the image sensor, of a landmark identified in the map data. The processor is configured to determine orientation of the image sensor based on inertial measurement unit measurements. The processor is also configured to determine, based on position information, the orientation, and the map data, a second estimate of the position of the landmark. The processor is configured to determine position offset data based on a comparison of the first estimate and the second estimate. The processor is also configured to generate, based on the position offset data and the position information, an output indicating an adjusted position.

Disclosed are a system, apparatus, and method for optimizing GNSS search. A first radio signal is received from a terrestrial base station and a coarse location of the mobile device is estimated. A first time offset of the terrestrial base station to a timing signal of a target satellite is determined for locating a position of the target satellite. A distance from the position of the target satellite to the estimated coarse location of the mobile device is determined. A GNSS search is performed based on the distance from the target satellite and the first time offset of the first radio signal from the first terrestrial base station.

Positioning assistance data (PAD) may be partitioned into positioning System Information Blocks (posSIBs) and periodically broadcast by a base station. A posSIB or scheduling information for a posSIB may include a validity time and a validity tag that indicates whether the PAD for a posSIB has changed. A user equipment (UE) may receive a posSIB comprising PAD and the validity time and the validity tag for the posSIB. The UE may then wait until the validity time expires and/or the validity tag in the scheduling information indicates a change of PAD before receiving a new instance of the posSIB. The validity time and validity tag may both be included in the posSIB, in which case the UE may receive the posSIB and then look at the validity tag to determine whether to decode and process the PAD.