Disclosed are methods and apparatuses for improving location estimation. The method receives LCI updates from an LCI disambiguation engine. The method determines that a trigger threshold is reached, wherein the trigger threshold is based on proximity to a poor location estimation region. The method requests enhanced assistance data, wherein the assistance data includes at least one AP associated with a second LCI that is different than a first LCI, the first LCI being associated with a present position of the apparatus. The method receives position updates from a Position Engine using the enhanced assistance data.