Patent ID: 7925276

Claim:
An area-based positioning method for a mobile communications system wherein said system is conformed to the existing Open Mobile Alliance SUPL standard, the method performed by a server and comprising: sending, by the server, a SUPL INIT message to a SET in order to initiate a SUPL procedure for an area event triggered session, based upon a positioning request for the SET, the SUPL INIT message comprising a session-id, an intended positioning method, a proxy/non-proxy mode indicator, and a trigger type indicator; sending a SUPL TRIGGERED RESPONSE message to the SET in response to receiving a SUPL TRIGGERED START message from the SET in order to start an area event triggered session with the SET, wherein the SUPL TRIGGERED START message comprising a session-id, a location-id, and SET capabilities, and the SUPL TRIGGERED RESPONSE message comprises at least one of a session-id, a positioning method, trigger parameters, and location identifiers of an area specified for the area event triggered session; receiving a SUPL POS INIT message from the SET to start the area event triggered session, when a comparison performed by the SET of a current area-id and the location identifiers of the area specified for the area event triggered session indicates that positioning of the SET is to be executed; exchanging position procedure messages with the SET during the positioning session; calculating actual positioning information indicating longitudinal and latitudinal values of the SET that operates in SET-assist mode, whereby the SET does not calculate the actual positioning information; sending a SUPL REPORT message to the SET, the SUPL REPORT message including the session-id and the calculated actual positioning information of the SET, in order to allow the SET, which operates in SET-assist mode, to compare the calculated actual positioning information with the trigger parameters; and receiving a SUPL REPORT message from the SET, the SUPL REPORT message including the session-id and the calculated actual positioning information of the SET, if the calculated actual positioning information indicates that the trigger parameters are satisfied by the SET.