Crowdsourcing based on base station almanac quality

A method in a mobile device for throttling crowdsourcing data, the method comprising:

• receiving, from a base station almanac server, a base station almanac that is based on a current cell identifier;
• identifying, for each particular base station of at least three base stations, a cellular identifier for the particular base station;
• computing a first position estimate of the mobile device based on locations of the at least three base stations;
• determining a second position estimate of the mobile device, wherein the second position estimate of the mobile device is independent of signals from the at least three base stations;
• determining that a discrepancy exist from a difference of the first position estimate and the second position estimate being greater than a threshold;
• and
• sending crowdsourcing information for the at least three base stations, based on the discrepancy, to the base station almanac server;
• wherein the crowdsourcing information comprises:
• the cellular identifier for each particular base station of the at least three base stations;
• and
• the first position estimate and the second position estimate.