A system and method in which the position update rate is adaptively
modified, based on previous position measurements. By adjusting the
update rate based on velocity predictions from two or more position
fixes, a lower update rate may be used without exceeding the maximum
error. Lowering the update rate reduces power consumption in the UE,
providing longer battery operation. The updating method may comprise
periodically repeating the velocity prediction and periodically adjusting
the update rate responsive thereto. The update rate may be adjusted using
additional information such as an acceleration prediction, a minimum
update rate, or a preferred error. In some embodiments a model for user
movement may be used to provide more accurate predictions, for example,
stationary, walking, jogging, city driving, and freeway driving. The
updating method may comprise receiving user input regarding the maximum
position error.