Fremgangsmåder og apparater til assisterede navigationssystemer

摘要

The invention relates to a navigation systems and elements. A network element (M) comprises a receiver (M.2.2) for forming assistance data relating to at least one navigation system. The network element (M) inserts indication of the navigation system and a selected mode into the assistance data and constructs the assistance data according to the selected mode. The network element (M) has a transmitting element (M.3.1) for transmitting the assistance data via a communications network (P) to a device (R). The device (R) comprises a positioning receiver (R.3) for performing positioning on the basis of one or more signals of said at least one satellite navigation system; a receiver (R.2.2) for receiving the assistance data from the network element (M); and an examining element (R.1.1) adapted to examine the received assistance data. Said assistance data is adapted to be used by the positioning receiver for performing positioning of the device (R).