[srsran-users] Unable to connect SRS UE to private network

[Liam Fruzyna]

Hi Andre, Robert,

Thanks for the instruction, I have attached a copy of the log file.

We know the setup is sent because the network we are connecting to is
internally developed, so we have full access to its logging and control.

Thanks to the detailed log file from the UE we were able to determine that
the UE is bailing 8 subframes (ms) after sending the connection request.
This is contrary to the logs saying the ContentionResolutionTimer is 64 ms.
We were able to work around the issue by increasing the number of msg3
transmissions from 1 to 6.

Could this be a bug in the UE? Does it expect msg3 retransmissions to be
able to connect?

2022-04-11T13:34:13.140578 [MAC    ] [I] [ 2352] UL 5:  New TX for Msg3,
RV=0, TBS=7
2022-04-11T13:34:13.140605 [MAC    ] [I] [ 2353] RA:    ConRes: Starting
ContentionResolutionTimer=64 ms
2022-04-11T13:34:13.140648 [PHY0   ] [I] [ 2353] PUSCH: cc=0, tti_tx=2357,
rnti=0x3f, rb=(1,3), nof_re=432, tbs=7, mod=2, rv=0
2022-04-11T13:34:13.147709 [RRC    ] [I] MEAS:  New measurement serving
cell: earfcn=0, pci=1, rsrp=-71.81 dBm, cfo=+2380.0 Hz
2022-04-11T13:34:13.148604 [PHY0   ] [I] [ 2361] PHICH: hi=0, corr=0.5,
I_lowest=1, n_dmrs=0, I_phich=0
2022-04-11T13:34:13.148605 [MAC    ] [I] [ 2361] UL 5:  Maximum number of
ReTX reached (1). Discarding TB.
2022-04-11T13:34:13.148648 [MAC    ] [W] [ 2361] RA:    ConRes: Contention
Resolution is considered not successful. Stopping PDCCH Search and going to
Response Error

Thanks,
Liam

On Mon, Apr 11, 2022 at 5:00 AM Andre Puschmann <andre.puschmann at srs.io>
wrote:

> Hi,
>
> perhaps the Tx power is to weak and the Connection request isn't even
> received by the network. How do you know a setup is even sent?
>
> In any case, please attach full UE logs in info level.
>
> Cheers
> Andre
>
> On 5/4/22 21:40, Liam Fruzyna wrote:
> > Hi,
> >
> > I am attempting to connect the SRS UE to a private (non-SRS) network. I
> > am currently using LTE on channel 3350 and while I can attach a normal
> > handset without issue, I cannot attach the SRS UE. When the network
> > replies to the RRC Connection Request with an RRC Connection Setup, no
> > response is received by the network. This is because the UE appears to
> > not to receive the RRC Connection Setup and times out. Are there any
> > logging techniques that can help us confirm if the message is being
> > received at all and where the failure might be? Or any insight into why
> > this problem is occurring?
> >
> > I have attached copies of the RRC Connection Setup message, PCAP file,
> > and console output.
> >
> > I should also note I am primarily using a USRP B200 mini, but have also
> > replicated this result with a B210 and X300.
> >
> > Thanks,
> > Liam
> >
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