METHODS AND APPARATUS FOR PROVIDING LOCATION DATA WITH VARIABLE VALIDITY AND QUALITY

摘要

Methods, systems and computer program products for broadcasting location information through out of band service mechanism such as SMS are described. Specifically, ephemeris assist information, which may contain a datafile of geographic location(s) over a period of time validity, and which may contain information associated with operational satellites in a ephemeris interval, predicted ephemeris interval or any number of subsequent predicted ephemeris intervals may be used to identify a geographic location of a device. The ephemeris assist information may subsequently be broadcast to the device using one or more messages.