Patent ID: 7228140

Claim:
A system comprising: a home positioning node that receives a mobile station's geoposition request from a service application, and generates a home positioning node's positioning request message including a home positioning node identification parameter; an anchor positioning node that receives the home positioning node's positioning request, validates the home positioning node identification parameter, and generates an anchor positioning node's positioning request message including the home positioning node identification parameter; an anchor switching node that receives the anchor positioning node's positioning request, processes the anchor positioning node's positioning request, and forwards the anchor positioning node's positioning request in a forwarded positioning request after the mobile station hands off to another network; a serving switching node that receives the forwarded positioning request, and sends a serving switching node's positioning request including the home positioning node identification parameter; and a serving positioning node that receives the serving switching node's positioning request, and validates the home positioning node identification parameter prior to returning a geographic position of a mobile station.