HL8548-G How to Assisted GPS ?

IoT Modules Legacy HL Series
1

Hi,

I tried to Assisted-GPS function.
(use Development kit)

But looks like it isn’t working.
(positioning time is not much difference between the used A-GPS and the not used A-GPS.)

What is wrong in my AT-commands?

My AT-commands:

AT&K3
OK

AT+CPIN="XXXX"
OK
+CREG: 2
+PBREADY
+CREG: 1,"XXXX","XXXXXXXX",6
+CGREG: 4
+CGREG: 1,"XXXX","XXXXXXXX",6,"XX"
+CTZV: +36,"16/01/28,18:00:31"
+XNITZINFO: "GMT+09:00","16/01/28,18:00:31"
+CREG: 1,"XXXX","XXXXXXXX",2

AT+KCNXCFG=1,"GPRS","XXXXXXXX","XXXXXXXXX","XXXXXXXX"
OK

AT+KCNXTIMER=1,60,2,70
OK

AT+KCNXPROFILE=1
OK

AT+CGATT=1
OK

AT+GPSSUPLCFG?
+GPSSUPLCFG: 0,"supl.google.com",7276,2,0
+GPSSUPLCFG: 1,-1,1,1
OK

AT+CMOLR=2,1,1,122,1,1,100,,1,,5,64,0,""
OK

AT+CMOLR?
+CMOLR: 2,1,1,122,1,1,100,0,1,,5,64,0
OK

AT+CMTLR=3
OK

AT+CMTLR?
+CMTLR : 3
OK

AT+CMTLRA?
+CMTLRA : 0, 0
OK

AT+GPSPVT=1,1
OK

AT+GPSSTART=3
OK
+GPSEVSTART: 1

Other functions (phone, ftp and http) are normally operations.

Thanks,
kobayashi

2

I didn’t understand why you are using CMOLR…

Did you check the examples mentioned in the AT command guide?
It’s like for the very first time, there won’t be much difference as the SUPL data is not yet used…

-Alex

3

Thank you for your replay.

I checked and tried to the examples mentioned, with exactly the same result.
※AT_Commands_Interface_Guide_Rev12_0, p626~675
I think if A-GPS works, the determine position takes about 10 seconds, right??
But my result is 30 to 80 seconds.

=========== Testing environment ===========
-> Open Sky
-> HL Dev Kit SKU#6000620
-> GPS ANTENNA … GC431
-> GSM ANTENNA … unknown attached
-> Hot start … Positioning time within 5 seconds
-> Cold start … 30 to 80 seconds

Could you let me know any idea about my AT-Command ??
Or show me your AT-Command sequence when you tested the products ??

best regards,
kobayashi