Using broadcast position and transmit power from access points to form assistance data

摘要

Systems, apparatus and methods for preparing assistance data in a location server from coverage report messages of one or more access points from a plurality of mobile devices are presented. Several mobile devices each collect information from and about one or more access points. This crowd-sourced information is sent from a mobile device to a location server and may include ranging information (such as RSSI or RTT) and/or broadcast information (such as broadcast position and/or transmit power level) and/or computed information (such as path loss). Using this crowd-sourced information, the location server may form assistance data for an assistance data database, which may later be tailored for and send to a specific mobile device.

主权项

1. A method in a location server for preparing assistance data,
the method comprising: computing a crowd-sourced position from a crowd-sourced database for an access point, wherein the crowd-sourced database for the access point comprises ranging information for the access point measured by a plurality of mobile devices and a location of each mobile device in the plurality of mobile devices, wherein the crowd-sourced position is computed based on the ranging information measured by the plurality of mobile devices and the location of each mobile device; determining that the access point is broadcasting a broadcast position of the access point; setting a position of the access point based on information of the crowd-sourced position computed by the location server and the broadcast position broadcasted by the access point; saving the position of the access point to an assistance data database.