Method and device for determining positioning assistance data, method and device for positioning user equipment

The invention relates to a method for determining positioning assistance data on a server, and server equipment. The method comprises the steps of receiving a plurality of messages aiming at first reception equipment from a plurality of user equipment at a plurality of geographic locations; based on the plurality of messages, determining a first polynomial on the basis of the polynomial fitting technique; and at least storing the coefficient of the first polynomial as one part of the positioning assistance data of the first reception equipment in a manner associated with the first reception equipment. The invention also relates to a method for positioning user equipment on the user equipment, and the user equipment. The method comprises the steps of searching a signal from the first reception equipment by the user equipment in a geographical region; determining the strength of the signal from the first reception equipment; acquiring the positioning assistance data stored in the local user equipment; and posit