Assisted GPS (AGPS) on SIM7600 module does not work

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I recently got a SIM7600G breakout board and wanted to use it with the CGPS functionality for A-GPS. It works with connecting with my SIM to the Internet and all, but when I try to use AT+CGPS=1,3 (UE-assisted mode), I receive the following in response to my setup:

OK
+CGPS: 0

I interpret this as the GPS being turned off in response to this mode being selected.

I am currently interacting with the board via USB and with the “AT Command Tester For Simcom Modules”, so I don’t think it’s a voltage issue as the other final post indicated. My current setup is as follows, all “OK” in response and no errors:

AT+CGSOCKCONT=1,"IP","APN_HERE"
AT+CGPSURL="supl.google.com:7276"
AT+CGPSSSL=0
AT+CGPS=?
AT+CGPS?
AT+CGPS=0
AT+CGPS=1,3

While mode 2 does work (UE-based), this is extremely inaccurate and defeats the purpose of my project. Has anyone ever gotten UE-assisted (A-GPS) mode to work on the SIM7600, let alone any Simcom module? If so, how did you get it to work? Is it a SUPL server issue? Firmware?

Any help would be greatly appreciated!embeddedmobilesimsimcomShareCiteEditFollowFlagasked 2 hours agouser19955651111 bronze badge

• Just a quick comment. (1) As you said, your test setup, including Mode 2, are all OK except coming to Mode 3 (AT+CGPS=1,3), my first wild guess is that it is not USB/UART problem, because it is all simple serial UART interface, at which level only the level at AT commands are interpreted. (2) If I was doing troubleshooting, I would try the following: (a) Use Windows 7/10 USB to serial adaptor cable, and not Widnows USB to SIM7600 USB, because SIM firmware might not entertain all USB to SUB stuff, / to continue, … – tlfong01 28 mins ago   
• (b) If you are using Rpi python, you might like to compare and contrast my basic SIM7600 test program with sample outputs: (3) Reference: Rpi3B+ Python … SIM7600 Problem, Asked 1 year, 5 months ago, Viewed 642 times: raspberrypi.stackexchange.com/questions/113992/…. – tlfong01 28 mins ago    
• (3) Ah, you remind me one thing: I played with Neo-6/7/8 GPS Modules before trying SIM7600 GPS. When I first tried SIM7600 GPS, my first feeling was that its GPS hardware is a bit outdated, comparing to Neo. So I decided to switch back to Neo, with their very user friendly Windows based GUI interface. (4) References: Rpi Neo-6M / Neo-8M GPS Module Setup / Fix / Update Problems (a) electronics.stackexchange.com/questions/557417/… / to continue, … – tlfong01 8 mins ago    
• (b) raspberrypi.stackexchange.com/questions/113544/…. So my suggestion is to separately test Neo6/7/8/9M first, then come back to SIM7600 with integrated GPS hardware. – tlfong01 8 mins ago    
• (4) Ah, I also remember another thing. SIM800 “autobaud” function actually did not work as specified in their user manual. And as the saying goes: “there isn’t only one cockroach in the kitchen”, I am not surprised that your problem is another SIM hardware/firmware bug. – tlfong01 just now   Edit   

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