[srslte-users] Trying to connect the UE with the programmable USIM card to connect to the 4G network

[Nehemiah Chan]

Hi everyone,

Currently, just a small update, I have managed to connect to the network
(still having issues surfing the net). Aside from that, by changing the
protocols (like s1ap and mac-lte), I noticed that i will be to sniff key
information for M-TMSI/IMSI/TAC etc from the configurations in the enb/epc
files. If it is possible to get more important information using wireshark,
I will appreciate it if you can guide me along the way.

Besides that, is it possible for the base station to send commands to
control the UE if it is (not) connected to the network? I do understand the
question is slightly off topic from the subject of the question.

Thanks in advance.

Best Regards,
Nehemiah

On Tue, Jun 18, 2019 at 5:53 PM Nehemiah Chan <nehemiahchan1999 at gmail.com>
wrote:

> Hi everyone,
>
> I am currently trying to troubleshoot for errors as I am currently trying
> to connect the network but I am totally not sure what went wrong. I have
> configured the USIM parameters such as OPC/K/IMSI to be the same as the
> user_db.csv.example. The MCC/MNC it is set as 001/01. When the phone search
> automatically while I run the sudo srsepc/ sudo srsenb commands. It takes a
> while for the phone to connect to the network, when it does connnect, the
> network it shows that I am connected to is Software Radio Systems Limited.
>
> Well, it does show the 4G network icon on the phone, when I tried to surf
> the net/ go to google play store it does tell me that the the phone is not
> connected to the 4G network. Even the phone may be connected to the
> "network", it does disconnect after a while. I have tried to set the
> computer on performance mode and masquerade the interface when surfing the
> net. Any help would be greatly appreciated here. I will upload the
> epc/ue/enb configuration files with the pcap files .
>
> Goal: Currently, my goal is for the phone (as the UE) to connect to the 4G
> network.
> Next, I would like to sniff for the broadcast messages as the UE surfs the
> net. I have also read on other post "Trying to pickup broadcast
> messages[2]". While my goal is similar to his, I will appreciate if you can
> guide me step by step, as I am not knowledgeable in the LTE as well as the
> linux commands. I have a few questions to ask if I do change the ue tx
> gain, do I need to change any other configuration like the enb tx gain? I
> also did a few tests on the n_prb=25/15/50. Ideally should the n_prb be
> somewhere 15/25?
>
> Besides that, when I start up wireshark, I also countered this issue, I am
> not sure if I should be worried it.
> $ wireshark
> void DBusMenuExporterPrivate::addAction(QAction*, int): Already tracking
> action "" under id 195
> void DBusMenuExporterPrivate::addAction(QAction*, int): Already tracking
> action "" under id 196
> 16:58:19.713     Main Warn QVariantMap
> DBusMenuExporterDBus::getProperties(int, const QStringList&) const:
> Condition failed: action
>
> The current setup is B210, Ubuntu 16.04, uhd 3.9.7. USIM card is from
> sysmocom. I tried using on Samsung s6 and Samsung s8 so far.
>
> Once again, I will greatly appreciate for any help provided. Thanks in
> advance.
>
> Best Regards,
> Nehemiah
>
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