Patent ID: 7590424

Claim:
A method of measuring a position of a mobile communication terminal within an area accommodated by a mobile communication network, comprising: obtaining, from the mobile communication network, a position registration area identifier, wherein the position registration area identifier depends upon a location of the mobile communication terminal within the area accommodated by the mobile communication network; storing the position registration area identifier in a memory of the mobile communication terminal; monitoring a number of changes in the position registration area identifier; detecting that the number of changes in the position registration area identifier since a precise position of the mobile communication terminal was calculated exceeds a threshold; in response to each detection that the number of changes in the position registration area identifier since the precise position of the mobile communication terminal was calculated exceeds the threshold, determining the precise position of the mobile communication terminal, wherein determination of the precise position of the mobile communication terminal comprises: retrieving, from the memory, the position registration area identifier; sending, through the mobile communication network, a request for position measurement assist data to a position assistance server, wherein the request for position measurement assist data includes the position registration area identifier; in response to receipt of the position measurement assist data, obtaining, at the mobile communication terminal, location data from a satellite; and in response to obtaining the location data, sending a request for calculation of the precise position of the mobile communication terminal to the position assistance server, wherein the request includes the location data; and receiving the precise position of the mobile communication terminal at the mobile communication terminal from the position assistance server.