CPC G01S 5/013 (2020.05) [G01S 5/011 (2020.05); G01S 5/012 (2020.05); G01S 5/02521 (2020.05); G01S 5/02523 (2020.05); G01S 5/02526 (2020.05); G01S 19/17 (2013.01)] | 20 Claims |
1. A method comprising:
receiving, by at least one positioning server from a plurality of mobile devices, information indicating a plurality of Global Navigation Satellite System (GNSS) rescue areas, wherein each respective GNSS rescue area of the plurality of GNSS rescue areas corresponds to a respective geographic area visited by a respective one of the plurality of mobile devices in which (i) at least one GNSS-based position estimate is or was unavailable and (ii) the respective mobile device had demand for positioning data of at least a pre-defined accuracy level;
generating, by the at least one positioning server, a GNSS rescue map representing radio data for the plurality of GNSS rescue areas; and
transmitting, by the at least one positioning server to a first mobile device, an offline radio map representing a subset of the GNSS rescue map, to provide radio data for at least one of the plurality of GNSS rescue areas or portion thereof in accordance with the subset.
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