[srsran-users] 5G SA connection problem with Quectel (RM500Q-GL)

[Cedric Roux]

maybe have a look at:
https://gitlab.eurecom.fr/oai/openairinterface5g/-/wikis/ci/quectel-at-commands

On 1/12/23 03:56, Cagalli Athha wrote:
> Hi, I have a trouble when I try to use Quectel (RM500Q-GL) to connect to 
> gNB. The configuration is in the following.
> 5GC : Open5GS
> SDR: Ettus B210
> 
> I follow the tutorial in srsran document. 
> https://docs.srsran.com/en/latest/app_notes/source/5g_sa_COTS/source/index.html <https://docs.srsran.com/en/latest/app_notes/source/5g_sa_COTS/source/index.html>
> 
> Quectel (RM500Q-GL) can be configured using AT commands and I configure 
> in 5G-SA mode. I can list all the cell sites and see my cell site.
> 
> AT+COPS=?
> 
> +COPS: (1,"999 70","999 70","99970",12)
> 
> 
> The last value ,12, means NG-RAN. I then try to connect using
> 
> 
> AT+QCFG="usbnet",1
> 
> AT+CGDCONT=1,"IPV4V6","internet"
> 
> AT+CFUN=1,1
> 
> 
> But when I check the connection status I got
> 
> 
> AT+QENG="servingcell"
> 
> +QENG: "servingcell","LIMSRV","NR5G-SA","FDD", 
> 999,70,19B01,500,7,368410,3,1,-70,-15,20,0,7680
> 
> According to the manual "LIMSRV" means
> 
> 
> "LIMSRV" UE is camping on a cell but has not registered on the network.
> 
> 
> I checked the signal level and It seems to be ok. But, somehow, Quectel 
> (RM500Q-GL) cannot register to the network. Any idea what the 
> problem is? I also want to make sure that the problem is not from the 
> SIM card.
> 
> I am using the SIM Card from
> 
> https://shop.sysmocom.de/sysmoISIM-SJA2-SIM-USIM-ISIM-Card-10-pack-with-ADM-keys/sysmoISIM-SJA2-10p-adm <https://shop.sysmocom.de/sysmoISIM-SJA2-SIM-USIM-ISIM-Card-10-pack-with-ADM-keys/sysmoISIM-SJA2-10p-adm>
> 
> 
> I try to configure SIM card as stated in the manual.
> 
> 
> ./pySim-shell.py -p0 --script ./scripts/deactivate-5g.script
> 
> 
> This seems to deactivate 5G since the script file disables all 5G 
> fields. Now, I am confused.
> 
> 
> Then, I follow this guide from the link in the document with a new SIM card
> 
> 
> https://gist.github.com/mrlnc/01d6300f1904f154d969ff205136b753 
> <https://gist.github.com/mrlnc/01d6300f1904f154d969ff205136b753>
> 
> 
> It still does not work.   In the guide above I dont even know what the 
> value of
> 
> Routing Indicator shoud be. Can I just set to 0x0
> 
> 
> "The Routing Indicator is a four-byte file but the actual Routing 
> Indicator goes into bytes 0 and 1 (the other bytes are reserved). To set 
> the Routing Indicator to 0x71:
> 
> |pySIM-shell (MF/ADF.USIM/DF.5GS/EF.Routing_Indicator)> update_binary 
> 0071ffff |
> 
> (the encoding might be different, seethis comment 
> <https://gist.github.com/mrlnc/01d6300f1904f154d969ff205136b753?permalink_comment_id=4050795#gistcomment-4050795>) You can also set the routing indicator to0x0, which is/valid/and means "routing indicator not specified", leaving it to the modem. "
> 
> I did not change PLMN. It is till 999 70 from the factory. What is the 
> exact way to set the SIM card from sysmocom? I checked the mailing list 
> and saw that Quectel (RM500Q-AE) can be used with srsran 5G. I am not 
> sure what I miss in the configuration.
> 
> 
> Thank you very much
> 
> 
> Apichart
> 
> 
> 
> 
> 
> 
> 
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