[srsran-users] Samsung A22 can see the 5G network but cant connect to it

[Chris Newman]

Hi joe joe,

 >I am trying to connect a carrier unlocked Samsung Galaxy A22 to the 5G 
SA network following the application 
note(https://docs.srslte.com/en/latest/app_notes/source/5g_sa_COTS/source/index.html), 
but I haven't been able to successfully connect it. The COTS UE can see 
the network since the test PLMN(99970) shows up, but when the network is 
selected the phone never attempts a rach connection.

I get the same behaviour using an (Exynos) S22. I have a b205mini-i with 
an external GPSDO (which I note needs longer than 300ms to lock).

I see that your conf enables the on board GPSDO:

device_args = clock = gpsdo

I had thought that having the on-board GPSDO 
<https://www.ettus.com/all-products/gpsdo-mini/> vs the external GPSDO 
may help with some of the devices that can't RACH.

Can you confirm the GPSDO signal is being picked up? I only get 
confirmation when it doesn't work though the b205mini-i has (on the 
board, see through a gap) green LED indicators as well:

/home/chris/dev/sdr/srsran/22.10/srsRAN/lib/src/phy/rf/rf_uhd_imp.cc:833: 
Could not lock reference clock source 3000. Sensor: ref_locked=false

I also note that when the GPSDO is connected that doesn't necessarily 
mean the signal itself is locked. I have a Leo Bodnar GPSDO which has 
LED indicators that turn red when it is locked on to enough satellites. 
Though perhaps the UHD driver is better able to determine this for the 
on board one.




On 17/02/2023 10:09, srsran-users-request at lists.srsran.com wrote:
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>     1. Samsung A22 can see the 5G network but cant connect to it
>        (joe joe)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 16 Feb 2023 14:41:08 -0500
> From: joe joe<ettus.project.5g at gmail.com>
> To:srsran-users at lists.srsran.com
> Subject: [srsran-users] Samsung A22 can see the 5G network but cant
> 	connect to it
> Message-ID:
> 	<CA+iWUGs1FAUF6LovQw3k63GOtq-2doaqhhwua-MaxtfhACwFaQ at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Hello all,
>
> I am trying to connect a carrier unlocked Samsung Galaxy A22 to the 5G SA
> network following the application note(
> https://docs.srslte.com/en/latest/app_notes/source/5g_sa_COTS/source/index.html),
> but I haven't been able to successfully connect it. The COTS UE can see the
> network since the test PLMN(99970) shows up, but when the network is
> selected the phone never attempts a rach connection.
>
> Here's my setup:
> Ubuntu 20.04
> Samsung Galaxy A22 build # RP1A.200720.012.A226RBU3AVB1
> Ettus B200
> Cabled Connection
> open5GS core network
>
>
> I've tried modifying the TX and RX gain along with lowering the pdsch and
> pusch values but that hasn't caused any change in connectivity success.
> This doesn't seem to be a SIM card authentication issue either since it
> cant establish a RACH connection.
>
> Attached is the config and log file for the enbUHD.
>
> Any and all help would be greatly appreciated.
>
> Thanks,
> Joe
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