Patent ID: 8085195

Claim:
A method of receiving location based services for a mobile station having a satellite positioning system receiver, comprising: providing a request from the mobile station for assistance data for the satellite positioning system receiver at a global secure user plane location center (G-SLC), where the G-SLC comprises a database of cell identifiers, said database of cell identifiers storing: an identification of a plurality of cell towers in a plurality of networks, wherein at least one of the cell towers in at least a first of the plurality of networks is supported by a first home secure user plane location center (H-SLC) and at least one of the cell towers in at least a second of the plurality of networks is supported by a second home H-SLC; and a location for each of the plurality of cell towers in the plurality of networks; generating assistance data at the G-SLC, where the assistance data corresponds to a position estimate for the mobile station, wherein the mobile station is in radio communication with a particular cell tower, and wherein the position estimate is a location for the particular one of the cell towers in the database of global assistance data if the particular cell tower is one of the plurality of cell towers in the database of cell identifiers; and receiving the assistance data to the mobile station.