[srsran-users] srsUE not attaching to real eNB - bladeRF 2.0 micro xA5

[Cagalli Athha]

Can you try to set different channels? Try to set Earfcn in enb.conf to be
a channel frequency that is in round number. I have to same problem too. It
seems that in some Earfcns frequency is off a bit and UE cannot connect. I
use those  Earfcns in B210 and it seems to be ok. The problem is only for
Bladerf. I guess it is a driver problem.

On Sat, Nov 5, 2022 at 11:06 PM Antonio Albanese <
antonioalbanese15 at gmail.com> wrote:

> Hey fellas,
>
> I am having quite some trouble connecting to a real eNB using a bladeRF
> 2.0 micro xA5.
>
> *Disclaimer*: when I use a USRP B210 with exactly the same ue.conf file,
> srsue decodes MIB and SIBs, and attempts to attach. At the moment the
> authentication fails but that is intended as I am using a random IMSI
> (including the correct PLMN digits for my *desired* operator).
>
> On the other hand, whenever I use a bladeRF I cannot get any attach
> attempt.
>
> I thought about clock instability issues, so I am using an external GPSDO
> applied to the REFIN U.FL connector of the bladeRF. I checked and I can
> successfully get the PLL to lock, so the VCTCXO should be super stable at
> this point.
>
> I tried using both bladerf and soapy drivers. WIth the bladerf driver,
> srsue reaches SYNC state CAMPING but then it detects a radio overflow and
> tries to resync SFN in an infinite loop.
> With soapy drivers, I have even worse luck since srsue never synchronizes
> (this might be due to a missing setting for soapy indicating that the
> bladeRF should use the REFIN clock signal, I have not looked into that yet).
>
> If the USRP did not work, I would think of some CPU bottleneck, which
> would generate RF overflows. However, the USRP works perfectly and all my
> problems appear only with the bladeRF.
>
> I am attaching here both debug logs, with soapy and bladerf drivers.
>
> Any suggestion is highly appreciated and would save a fellow srsRAN user
> from desperation.
>
> Thank you so much!
> Bye!
> ᐧ
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