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A-GPS positioning technology is a combination of terrestrial network resources and traditional satellite navigation. Using cellular network base station and transmitting the auxiliary information to shorten time to first fix of the receiver and reduce the user's dependence on the satellite. In the study of A-GPS receiver assisted positioning technology process. Focuses on how A-GPS information assist the receiver signal acquisition. Then, using GNSS navigation signal simulator and cellular base station simulator to set up indoor A-GPS simulation tests system and studying on transmitting reference time, Doppler shift predicted values and ephemeris or almanac and other assisted information to the receiver, which implements accessibility for data encoding and transmission of signaling channels.