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LTE Location Based Services Technology Introduction - White Paper
Location Based Services (LBS) involves the process of determining where a device is located. Global Navigation Satellite System (GNSS) based solutions are highly accurate and the technology of choice for absolute position accuracy, providing the device has a good line-of-sight, but this is not always the case. A device can be in a highly dense urban environment with reduced satellite visibility or indoors with very low signal levels; these limitations of GNSS systems have meant that LTE cellular based alternatives have been developed within 3GPP Release 9 and are described in this white paper.