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

[Gunnar Kulbotten]

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?
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.srsran.com/pipermail/srsran-users/attachments/20200423/f47db438/attachment.htm>