Good news is #PRS Positioning Refrence Signal is back from R16.

Just to give you all idea #GPS is not the only Global Navigation Satellite in the world
we have many.
🌞 GPS- Global Positioning System [USA].[Global Coverage]
🌞 GLONASS-GLObalnaya NAvigatsionnaya Sputnikovaya Sistema [Russia]
🌞 GALILEO -[Europe] [Global Coverage]
🌞 QZSS- Quasi-Zenith Satellite System (QZSS) [Regional Coverage]
🌞 BDS- BeiDou Navigation Satellite System [Global Coverage]
🌞 SBAS-Satellite Based Augmentation Systems (SBAS), Including Indian navigation #Gagan 👏

These Satellite Forward their data in form of #Almanac #Ephimeris as Frame information towards the SMLC/LMF Base Stations.

🏠 #PositioningArchitecture :Shared with picture asper 3GPP #38.305

Protocol Used for Positioning are well known by
💡 #NRPP: New Radio Positioning Protocol | As per 3GPP #38.355

#NRPP messages are used not only for positioning with cellular data but also for requesting the mobile device to collect passive or active measurements of RAT-independent infrastructure. The mobile device collects measurements for a given amount of time from Wi-Fi and Bluetooth devices in range operating in Access Point (AP) mode and sends the report to the E-SMLC or LMF.

A typical #NRPP Works on below given Tasks
🌐 Request Capabilities: From Device/UE.
🌐 Provide Capabilities: To Device/UE.
🌐 Request Assistance Data: From Location server.
🌐 Provide Assistance Data: Towards Location server.
🌐 Request Location Information: Measurements/Estimate from Device/UE.
🌐 Provide Location Information: Measurements/Estimate to Device/UE.

The network-assisted GNSS methods rely on signaling between UE GNSS receivers and a continuously operating GNSS reference receiver network, which has clear sky visibility of the same GNSS constellation as the assisted UEs.

Two assisted modes are supported:
👉  #UE-Assisted: The UE performs GNSS measurements (pseudo-ranges, pseudo Doppler, carrier phase ranges, etc.) and sends these measurements to the LMF where the position calculation takes place, possibly using additional measurements from other (non GNSS) sources

👉 #UE-Based: The UE performs GNSS measurements and calculates its own location, possibly using additional measurements from other (non GNSS) sources and assistance data from the LMF.

Overall Data Contains for the Refrence Locations are:
💎 Reference Time Reference Location
💎Ionospheric Models
💎Earth Orientation Parameters
💎GNSS-GNSS Time Offsets
💎Differential GNSS Corrections
💎Ephemeris and Clock Models
💎Real-Time Integrity
💎Data Bit
💎Assistance Acquisition
💎Assistance Almanac
💎UTC Models and much more....


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