[srslte-users] Trouble connecting commersial UE (and some basic questions..)

[Gunnar Kulbotten]

The LTE modem is a Quectel  evaluation kit. I can send AT-commands to it. I
tried to do this now, to set APN, IPv4, etc.. the unhandled nas message I
had is now gone it seems, but the modem does not register to the
LTE-network. I set APN in windows too, and I don`t know what is supposed to
be set via AT-commands, and what is set in windows. If you have time to
have a look, I enclose the epc.pcap after setting IPv4 in the modem.
Gunnar

tor. 23. apr. 2020 kl. 18:01 skrev Pedro Alvarez <
pedro.alvarez at softwareradiosystems.com>:

> It seems like your dongle is requesting IPv6 connectivity, but srsEPC
> does not support that at the moment.
> The UE then gets stuck sending PDN connectivity requests just for the
> IPv6 networks.
>
> Can you access the APN settings in the dongle? And in the APN Protocol
> select IPv4, instead of IPv4v6?
>
> On Thu, Apr 23, 2020 at 4:38 PM Gunnar Kulbotten <gkulbotten at gmail.com>
> wrote:
> >
> > Thanks!
> > Here is the epc.pcap file.
> >
> > tor. 23. apr. 2020 kl. 17:18 skrev Pedro Alvarez <
> pedro.alvarez at softwareradiosystems.com>:
> >>
> >> Can you share the epc.pcap please?
> >> It might still be an APN issue, it would be nice to see the actual
> >> messages going around.
> >>
> >> On Thu, Apr 23, 2020 at 12:31 PM Gunnar Kulbotten <gkulbotten at gmail.com>
> wrote:
> >> >
> >> > I got a small step closer to get this working today! One problem is
> that my Quectel LTE modem won`t register to the srsLTE network. It is
> connected to a windows-pc. The modem gets ip 172.16.0.2 from the
> srsLTE-network. I put this address as gateway in the windows-pc network
> properties, and 17.16.0.10 as ip-address. This actually worked for little
> while, and I could ping the enodeb/epc-pc from the windows-pc! Then the
> status in windows chenged to "Disconnected", and the connection was lost.
> It reappeared for a short while, and was lost again.
> >> >
> >> > I got a new error message from the srsepc terminal window:
> >> >
> >> > UL NAS: Received Attach Complete
> >> > Unpacked Attached Complete Message. IMSI 1012345678912
> >> > Unpacked Activate Default EPS Bearer message. EPS Bearer id 5
> >> > Received GTP-C PDU. Message type: GTPC_MSG_TYPE_MODIFY_BEARER_REQUEST
> >> > Sending EMM Information
> >> > Unhandled NAS integrity protected message
> LIBLTE_MME_MSG_TYPE_PDN_CONNECTIVITY_REQUEST
> >> > Unhandled NAS integrity protected message
> LIBLTE_MME_MSG_TYPE_PDN_CONNECTIVITY_REQUEST
> >> > Unhandled NAS integrity protected message
> LIBLTE_MME_MSG_TYPE_PDN_CONNECTIVITY_REQUEST
> >> > And a lot more of these...
> >> >
> >> > I found this information from  the thread "NAS integrity error": "
> >> >
> >> > Seems like the UE is initially requesting the "oai.ipv4" APN. You can
> >> > see this in the ESM information response message in the PCAP. Only
> >> > after the attach is complete it requests the PDN connectivity to the
> >> > "srsapn" PDN."
> >> >
> >> > I thought maybe my problem was the same, but I can`t find any ESM
> information response message
> >> > in  my epc.pcap-file?
> >> >
> >> > From the beginning of epc.log:
> >> >
> >> > Built in Release mode using commit d045213f on branch master.
> >> >
> >> > ---  Software Radio Systems EPC log ---
> >> >
> >> > 10:18:59.364245 [HSS ] [I] Opened DB file: /etc/srslte/user_db.csv
> >> > 10:18:59.364388 [HSS ] [I] HSS Initialized. DB file
> /etc/srslte/user_db.csv, MCC: 61441, MNC: 65281
> >> > 10:18:59.390979 [S1AP] [I] S1-MME Initializing
> >> > 10:18:59.391230 [S1AP] [I] S1AP Initialized
> >> > 10:18:59.391250 [MME GTPC] [I] Initializing MME S11 interface.
> >> > 10:18:59.391272 [MME GTPC] [I] MME S11 Initialized
> >> > 10:18:59.391302 [MME GTPC] [I] MME GTP-C Initialized
> >> > 10:18:59.391313 [S1AP] [I] MME Initialized. MCC: 0xf001, MNC: 0xff01
> >> >
> >> > Is the MCC and MNC correct? Elsewhere they are 001 and 01?
> >> >
> >> > _______________________________________________
> >> > srslte-users mailing list
> >> > srslte-users at lists.softwareradiosystems.com
> >> > http://www.softwareradiosystems.com/mailman/listinfo/srslte-users
>
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