[srslte-users] B210 Sample Errors

[john wu]

Hi Matthew,
virtual machine often have problem for running usrp application. especially for the  wideband application.
you can try on a real pc to see if the problem disappear.



www.zhixun-wireless.top<http://www.zhixun-wireless.top/>
provide SDR PA LNA duplexer

Best Regards

________________________________
From: srslte-users <srslte-users-bounces at lists.softwareradiosystems.com> on behalf of MATTHEW SUMMERS <matt_s at btopenworld.com>
Sent: Friday, September 6, 2019 18:29
To: srslte-users at lists.softwareradiosystems.com <srslte-users at lists.softwareradiosystems.com>
Subject: [srslte-users] B210 Sample Errors

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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