Editing Assisted GNSS (section)

=== SUPL ===
The SUPL (Secure User Plane Location) protocol, unlike its control-plane equivalents restricted to mobile networks, runs on the [[Internet]]'s [[TCP/IP]] infrastructure. Consequently, its application extends beyond the original intended use of mobile devices and may be used by general-purpose computers.<ref>{{cite web |last1=Fernández-Prades |first1=Carles |title=Global receiver parameters |url=https://gnss-sdr.org/docs/sp-blocks/global-parameters/ |website=GNSS-SDR |date=17 July 2022 |language=en}}</ref> SUPL 3.0 legitimizes such use by adding admission for WLAN and broadband connections.<ref name=supl3>{{cite web |title=Secure User Plane Location Architecture - Candidate Version 3.0 [OMA-AD-SUPL-V3_0-20110920-C] |url=http://www.openmobilealliance.org/release/supl/V3_0-20110920-C/OMA-AD-SUPL-V3_0-20110920-C.pdf |website=Open Mobile Alliance |date=20 Sep 2011}} ([https://www.openmobilealliance.org/release/SUPL/V3_0-20181213-C/ suite of all standards])</ref>

Actions defined by SUPL 3.0 include a wide range of services like [[geofencing]] and billing. The A-GNSS functions are defined in the SUPL Positioning Functional Group. It includes:<ref name=supl3/>
* SUPL Assistance Delivery Function (SADF), which provides the basic information sent to the device in both A-GNSS modes.
* SUPL Reference Retrieval Function (SRRF), which tells the server to prepare the information mentioned above by receiving from the satellites.
* SUPL Position Calculation Function (SPCF), which lets the client or the server ask for the client's location. The server-generated location may result from MSA or from mobile cell. If a MSB (SET based) mode is used, the client reports its location to the server instead.

The specifics of communication is defined in the ULP (Userplane Location Protocol) substandard of SUPL suite. As of December 2018, GNSS systems supported include GPS, Galileo, GLONASS, and BeiDou.<ref name=supl3/>