Patent ID: 9148763
Filing Date: 2015-09-29
Classification: G01C,G01S,H04W

Abstract:
1. A method comprising, at a mobile station: transmitting a request, via a communication network, to a first repository device corresponding to at least a first one of two or more identifiers, the request to indicate at least a portion of a region that includes a rough location estimate of the mobile device and to request a stored description or characterization of an environment comprising the at least a portion of the region; receiving the stored description or characterization of the environment from the first repository in response to the request, the stored description or characterization of the environment indicating one or more locations of one or more wireless transmitters in the environment; generating positioning assistance data at the mobile station for use in providing a location-based service based, at least in part, on the stored description or characterization; transmitting at least a second one of said two or more identifiers to a second repository device over a wireless communication network; and in response to transmission of said at least a second one of said file location identifiers, receiving descriptions of one or more transmitters located in or transmitting into the area including said rough location.