[srslte-users] B210 Sample Errors

[Xavier Arteaga]

Hi,
Have you tried to run benchmark_rate (see
https://kb.ettus.com/Verifying_the_Operation_of_the_USRP_Using_UHD_and_GNU_Radio)
and make sure your system reaches the maximum sampling rate without any
issue?

sudo /usr/local/lib/uhd/examples/benchmark_rate --rx_rate 23.04e6 --tx_rate
23.04e6 --duration 60 --args type=b200

Regards,
Xavier

On Fri, 6 Sep 2019 at 12:40, MATTHEW SUMMERS <matt_s at btopenworld.com> wrote:

> Hi Folks,
>
> I am having problems with both eNB and UE applications interfacing with a
> B210. I cant seem to nail down what is wrong exactly. Sometimes the UE will
> get to RRC Connected but invariably I get UHD sample errors, see below,
> which may or may not be fixed with a reboot of PC/URSP. I cannot get srsenb
> working at all.
>
> To date I have trawled the mailing list and beyond looking for a solution
> and nothing has stood out.
>
> -- srsue Errors --
>
> Attaching UE...
> /home/matt/Documents/build/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.845: Error
> timed out while receiving samples from UHD.
> SYNC:  Receiving from radio while in IDLE_RX
> Searching cell in DL EARFCN=6400, f_dl=816.0 MHz, f_ul=857.0 MHz
> /home/matt/Documents/build/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.845: Error
> timed out while receiving samples from UHD.
> SYNC:  Receiving from radio while in IDLE_RX
> ./home/matt/Documents/build/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.845: Error
> timed out while receiving samples from UHD.
> /home/matt/Documents/build/srsLTE/lib/src/phy/ue/ue_sync.c.727: Error
> receiving samples
> /home/matt/Documents/build/srsLTE/lib/src/phy/ue/ue_cell_search.c.309:
> Error calling srslte_ue_sync_work()
> /home/matt/Documents/build/srsLTE/lib/src/phy/ue/ue_cell_search.c.268:
> Error searching cell
> /home/matt/Documents/build/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.845: Error
> timed out while receiving samples from UHD.
> SYNC:  Receiving from radio while in IDLE_RX
> /home/matt/Documents/build/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.845: Error
> timed out while receiving samples from UHD.
> SYNC:  Receiving from radio while in IDLE_RX
> /home/matt/Documents/build/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.845: Error
> timed out while receiving samples from UHD.
> SYNC:  Receiving from radio while in IDLE_RX
> /home/matt/Documents/build/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.845: Error
> timed out while receiving samples from UHD.
> SYNC:  Receiving from radio while in IDLE_RX
>
>
>
> -- srsenb Errors --
>
> [ERROR] [STREAMER] The receive packet handler caught a value exception.
> ValueError: bad vrt header or packet fragment
> /home/matt/Documents/build/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.845: Error
> timed out while receiving samples from UHD.
> /home/matt/Documents/build/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.845: Error
> timed out while receiving samples from UHD.
> /home/matt/Documents/build/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.845: Error
> timed out while receiving samples from UHD.
> /home/matt/Documents/build/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.845: Error
> timed out while receiving samples from UHD.
> /home/matt/Documents/build/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.845: Error
> timed out while receiving samples from UHD.
> /home/matt/Documents/build/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.845: Error
> timed out while receiving samples from UHD.
> /home/matt/Documents/build/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.845: Error
> timed out while receiving samples from UHD.
>
>
> First I tried it on the following:
> 1 - Ubuntu 18 in a VM
> 2 - srsLTE 19.06 from source and UHD_3.14.1.0-release
> 3 - B210 connected via USB 3
> 4 - CPU frequency scaling fixed
> 5 - multi-CPU config with 8GB RAM
> 6 - TX set gain to 89
>
> srsue connecting to a real eNB gives sampling errors ~80% of the time.
> srsenb never works.....it just errors
>
> So I tried it again on my NUC which has a lot more grunt (i7, 32GB, SSD).
>
> I built 2 more VMs, one with a vanilla apt-get install of UHD
> (3.14.1.0-release) and srsLTE (19.03) and then I built another from source
> with srsLTE 19.06 from source and UHD_3.14.1.0-release. I get exactly the
> same errors on these installs as well.
>
> Anyone have any pointers on where I can try next?
>
> Thanks in advance,
>
> Matt
>
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