network cells reported by active device
offline assistance position data validity period
online assistance, compute the first fix
GNSS users expect instant position information. With standard positioning this is often not possible because at least four satellites must be identified, and their complete data received. Under adverse signal conditions, data downloads from the satellites to the receiver can take minutes, hours, or even fail altogether. Performance can be improved by complementing the GNSS receiver data with information from mobile network cells that can benefit numerous applications.