Patent ID: 11864056
Assignee: T-MOBILE USA, INC.
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 10:
11. A computer system, comprising:
one or more servers that, at least:
receive, from a building footprint database, a developed fingerprint map that includes a plurality of collected reference data points on a navigated path, wherein the reference data points include stored wireless signal measurements and angular features that are associated with corresponding segments on the navigated path;
receive, from a user device, a plurality of wireless signal measurements and an angular feature over multiple time steps;
determine a wireless signal similarity between the received wireless signal measurements and the stored wireless signal measurements;
determine a spatial similarity between the angular feature and the stored angular features;
detect a revisiting of a segment on the navigated path based on the determined wireless signal similarity and spatial similarity; and
identify an indoor location of the user device based on the detected revisited segment.