What is A-GNSS (Assisted global navigation satellite system)?

Assisted GNSS ( Global Navigation Satellite System) is a GNSS Augmentation system that often improves startup performance. A-GNSS works by providing the necessary data to the device via a radio network instead of a satellite link. When GPS is applied with it, it is known as Assisted GPS or Augmented GPS. A-GNSS-enabled devices utilize the mobile network/ internet to provide additional location data which enables the device to provide accurate location information more quickly.