Described is a method that includes taking radio measurements of radio node signals observable at a mobile device; obtaining motion measurement data indicative of motion of the mobile device; determining, based on the motion measurement data, a motion state of the mobile device; and providing the radio measurements taken or information representative thereof and the motion state or information representative thereof. Described is also a method that includes obtaining radio measurements of radio node signals observable at a mobile device or information representative thereof obtaining a motion state of the mobile device, the motion state having been determined based on motion measurement data indicative of motion of the mobile device, or information representative thereof determining a position estimate of the mobile device at least based on at least some radio measurements or information representative thereof and the obtained motion state of the mobile device or the information representative thereof.