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Jun 05 04:48:34 <pabs3> https://blog.ubports.com/2017/06/01/community-update.html
Jun 05 13:09:48 <DocScrutinizer05> HMMPH, https://blog.ubports.com/2017/06/01/community-update.html "AGPS Mozilla Location Service" - *NO* this is *NOT* AGPS
Jun 05 13:10:21 <DocScrutinizer05> AGPS is about SUPL
Jun 05 13:11:32 <DocScrutinizer05> SUPL *may* involve RRLP which in turn is about U-TDOA which is "trilateration" but on WWAN level
Jun 05 13:13:17 <DocScrutinizer05> https://location.services.mozilla.com/ clearly isn't about trilateration, and I don't think they have SUPL at all involved
Jun 05 13:15:12 <DocScrutinizer05> https://www.google.de/search?q=site:https://location.services.mozilla.com+supl
Jun 05 13:18:49 <DocScrutinizer05> https://en.wikipedia.org/wiki/Mozilla_Location_Service
Jun 05 13:20:08 * DocScrutinizer05 wishes somebody would set up a decent SUPL server open for public use
Jun 05 13:21:07 <DocScrutinizer05> https://en.wikipedia.org/wiki/Assisted_GPS
Jun 05 13:21:35 <DocScrutinizer05> Secure User Plane Location
Jun 05 13:22:56 <DocScrutinizer05> on a sidenote: you CANNOT do trilateration (often incorrectly called triangulation) on standard WiFi or BT APs
Jun 05 13:23:58 <DocScrutinizer05> what mozolla does a simple signal fingerprinting, see http://lists.openmoko.org/pipermail/openmoko-kernel/2008-April/002434.html
Jun 05 13:28:12 <DocScrutinizer05> while http://lists.openmoko.org/pipermail/openmoko-kernel/2008-June/002987.html is about trilateration, though https://en.wikipedia.org/wiki/E-OTD based
Jun 05 13:28:27 <DocScrutinizer05> still no AGPS
Jun 05 13:30:01 <DocScrutinizer05> for doing either U-TDOA or E-OTD on WiFi etc, the whole system lacks a common high-accuracy timebase to allow determining the distance of device to any such AP
Jun 05 13:32:21 <DocScrutinizer05> SUPL is about providing a guess of current position **and according GPS almanac and particularly ephemeral** to the device, via internet, so the device doesn't need to download the data from sat
Jun 05 13:32:48 <DocScrutinizer05> and that's what AGPS is all about
Jun 05 13:34:23 <DocScrutinizer05> https://en.wikipedia.org/wiki/Assisted_GPS#Basic_concepts
Jun 05 13:39:50 <DocScrutinizer05> so in https://blog.ubports.com/2017/06/01/community-update.html they mix ~gsm-agps aka RRLP with SUPL aka AGPS and location signal fingerprinting ala https://en.wikipedia.org/wiki/Skyhook_Wireless resp http://lists.openmoko.org/pipermail/openmoko-kernel/2008-April/002434.html
Jun 05 13:40:04 <DocScrutinizer05> ~gsm-agps
Jun 05 13:40:04 <apt> RRLP is the Radio Resource LCS (Location Service) Protocol as specified first in GSM TS 04.31, or http://osmocom.org/projects/security/wiki/RRLP
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