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

[Gunnar Kulbotten]

Thanks!
Two antennas helped... I can now connect the UE to srsENB, if I first start
srsEPC, then srsENB, and lastly the  UE. I can ping the UE from the PC
running enb and epc. I never get "Connected" to the UE in Windows PC, that
is connected to the UE.  The signal bars in the Windows cellular setup page
shows full signal. I`ve setup APN in the Windows PC, and also masquerading
in the EPC/ENB-PC  to try to connect the UE to the internet. In the
testsoftware for the UE it connects to the network, and everything seems ok.

If I stop pinging, and try to ping some time later the UE often
disconnects, and won`t reconnect. I usually have to restart everything.
The SNR-column always show 0.100, except on the firs row, where the SNR
have a normal value of eg. 15.

lør. 18. apr. 2020 kl. 12:17 skrev Gunnar Kulbotten <gkulbotten at gmail.com>:

> Hi!
> Using srsUE seems to work fine. Also connecting a Samsung S4 seems to work
> as it should, I can ping the phone from the PC running srsENB and srsEPC.
> Im̀ setting up this srsLTE network to do some testing of a Quectel EG25
> commercial UE collocated with some other transmitting equipment.
>
> The Quectel modem sometimes connect to to the LTE network, and I can ping
> it from the PC, as with the phone. But usually I get a lot of messages
> after a short while that suggest that the conenction is lost. A lot of
> these from srsENB, and some other messages from the srsEPC.
>
> RACH:  tti=1341, preamble=3, offset=0, temp_crnti=0xeb
> Disconnecting rnti=0xeb
>
> Is this a sync problem?
>
> Im using the Ettus B210 SDR. I dont have a GPS.
>
> A (maybe stupid..) question regarding the B210: For Transmission Modus 1,
> am I supposed to use one or two antennas? There are two LEDs lit on RF-A,
> the red is for TX/RX, and the green for RX2.
> The Quectel modem came with only one antenna, connected to a port named
> "Main" It also has a unused port named "D" It also has a port for GPS,
> which is connected to a GPS-antenna.
>
> I`ve read a lot of threads from this mailing list, and it seems that many
> have trouble using commercial UEs with srsLTE. I find a few pieces of
> information here and there
> , but it is a very steep learning curve, and much of it is way over my
> head..
> Any advice on how to troubleshoot is appreciated :-)
>
>
>
>
>
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