US 9,813,871 B2
Positioning of mobile device
Mao Cai, Chengdu (CN)
Assigned to NOKIA SOLUTIONS AND NETWORKS OY, Espoo (FI)
Filed by NOKIA SOLUTIONS AND NETWORKS OY, Espoo (FI)
Filed on Dec. 15, 2016, as Appl. No. 15/380,075.
Claims priority of application No. 20155949 (FI), filed on Dec. 15, 2015.
Prior Publication US 2017/0171714 A1, Jun. 15, 2017
Int. Cl. H04W 4/02 (2009.01); H04W 64/00 (2009.01); H04W 88/02 (2009.01); H04W 88/18 (2009.01)
CPC H04W 4/025 (2013.01) [H04W 64/006 (2013.01); H04W 88/02 (2013.01); H04W 88/18 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A method comprising:
determining, by an apparatus, locations of a plurality of fixed positioning nodes;
receiving, by the apparatus, a measurement report from a mobile device, the measurement report comprising a plurality of measurement values measured by the mobile device, wherein each measurement value comprises a reference signal time difference indicating a radio propagation time difference between the mobile device and two different positioning nodes;
determining, on the basis of threshold comparison carried out by the location computer apparatus, that at least one of the plurality of measurement values is associated with an inaccurate measurement;
modifying, autonomously by the apparatus, said at least one of the plurality of measurement values; and
computing, by the apparatus, a location of the mobile device on the basis of a plurality of measurement values resulting from said modifying,
wherein said threshold comparison comprises:
determining an initial coverage area;
forming a grid of sub-areas within the initial coverage area;
computing a curve of possible locations of the mobile device in the initial coverage area from each measurement value;
determining, for each sub-area, a number of said computed curves crossing the sub-area;
determining a threshold and comparing said determined number of curves crossing the sub-area with the threshold;
removing from further analysis a sub-area crossed by a number of computed curves below the threshold and proceeding to further analysis a sub-area crossed by a number of computed curves above the threshold; and
said modifying comprises removing from further analysis one or more measurement values associated with a curve or curves that do not cross said one or more sub-areas proceeding to the further analysis.