[srsran-users] (no subject)

[Brendan McAuliffe]

Hi Jon,

Could you please send the config files, logs, and console output for your
set-up? If you can, run the tests again with the logs set to debug mode.

Using ZMQ this way is likely introducing a delay between the UE and eNB
communications, which is, in turn, causing sync issues.

Best regards,
Brendan

On Wed, 3 Aug 2022 at 10:12, Jon Backman <backmanjo908 at gmail.com> wrote:

> *Issue Description*
> Hello! We are trying to use GNU Radio and srsRAN to create a flow chart
> where a UE receives and sends its signals through ZMQ source and sink
> blocks.
>
> *Setup Details*
> Two Linux Computers that run on Ubuntu 22.04
> GNU Radio v 3.9
> Two B200mini USRPs
> We are doing over the air transmission
>
> *Expected Behavior*
> We want the UE and the eNodeB connect normally with the broker acting in
> between so we can easily see and modify the IQ values coming into the
> system.
> Actual Behaviour
>
> We have been able to successfully have a UE and eNodeB connect across
> these two computers and USRPs without GNU radio. When we try to run it with
> our flow graph, it cannot connect successfully. The UE can find cells, but
> after it tries to synchronize with random access transmission it never
> connects.
> Steps to reproduce the problem
>
> We have been doing everything on the command file using these commands:
> sudo ./srsRAN/build/srsepc/src/srsepc
> sudo srsenb
> sudo .srsRAN/build/srsue/src/srsue --rf.device_name=zmq
> --rf.device_args="tx_port=tcp://*:2001,rx_port=tcp://localhost:2000,id=ue,base_srate=11.52e6"
>
> *Additional Information*
> Here is an example of the output on the terminal
> Found Cell: Mode=FDD, PCI=1, PRB=50, Ports=1, CP=Normal, CFO=-0.8 KHz
> Current sample rate is 11.52 MHz with a base rate of 11.52 MHz (x1
> decimation) Samp Rate : 11.520000 Current sample rate is 11.52 MHz with a
> base rate of 11.52 MHz (x1 decimation) Found PLMN: Id=00101, TAC=7 Random
> Access Transmission: seq=11, tti=3701, ra-rnti=0x2 Random Access
> Transmission: seq=13, tti=3721, ra-rnti=0x2 Random Access Transmission:
> seq=27, tti=3741, ra-rnti=0x2 Random Access Transmission: seq=26, tti=3761,
> ra-rnti=0x2 Random Access Transmission: seq=49, tti=3781, ra-rnti=0x2
> Random Access Transmission: seq=4, tti=3801, ra-rnti=0x2 Random Access
> Transmission: seq=33, tti=3821, ra-rnti=0x2 Random Access Transmission:
> seq=17, tti=3841, ra-rnti=0x2 Random Access Transmission: seq=35, tti=3861,
> ra-rnti=0x2 Random Access Transmission: seq=31, tti=3881, ra-rnti=0x2 [zmq]
> Error: tx time is 0.136 ms in the past (51497403 < 51498964) [zmq] Error:
> tx time is 0.078 ms in the past (103677117 < 103678011) [zmq] Error: tx
> time is 0.227 ms in the past (125524338 < 125526956)
>
> Here is what is found in our log files for the UE
> 2022-08-01T21:23:52.722879 [PHY ] [W] [ 5695] SFN not yet synchronized,
> sending out-of-sync 2022-08-01T21:23:52.722962 [PHY ] [W] [ 5695] SNR=1.4
> dB RSRP=-46.7 dBm, sync=out-of-sync from channel estimator
> 2022-08-01T21:23:52.724029 [PHY ] [W] [ 5696] SFN not yet synchronized,
> sending out-of-sync 2022-08-01T21:23:52.724169 [PHY ] [W] [ 5696] SNR=1.5
> dB RSRP=-46.7 dBm, sync=out-of-sync from channel estimator
> 2022-08-01T21:23:52.725131 [PHY ] [W] [ 5697] SFN not yet synchronized,
> sending out-of-sync 2022-08-01T21:23:52.725229 [PHY ] [W] [ 5697] SNR=1.8
> dB RSRP=-47.1 dBm, sync=out-of-sync from channel estimator
> 2022-08-01T21:23:52.726227 [PHY ] [W] [ 5698] SFN not yet synchronized,
> sending out-of-sync 2022-08-01T21:23:52.726307 [PHY ] [W] [ 5698] SNR=1.7
> dB RSRP=-47.9 dBm, sync=out-of-sync from channel estimator
> 2022-08-01T21:23:52.727317 [PHY ] [W] [ 5699] SFN not yet synchronized,
> sending out-of-sync 2022-08-01T21:23:52.727408 [PHY ] [W] [ 5699] SNR=1.5
> dB RSRP=-48.6 dBm, sync=out-of-sync from channel estimator
>
> I attached a picture of our flowgraph in the email.
>
> Any and all help would be greatly appreciated.
> Thank you!
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