[srslte-users] Please share ue.conf example for LimeSDR-USB

[Andre Puschmann]

Hi Marc,

sorry for not getting back to you any earlier. And thanks for your
detailed report in the first post. I went through it again and I guess
the radio parts are fine as far as I can tell.

The issue in the first post is IMHO a timing problem. You're running a
20 MHz cell with means 30.72Msamples/s on the Lime. It can be tricky to
get a stable USB connection at those rates, therefore the lates, etc.

Any chance you can reduce the bandwidth of the cell you are using?

In your recent post, it seems you've been able to connect. I am not sure
what you changed here but please provide full UE logs and also the PCAP.
At least the last errors indicate an radio/USB issue again.

Thanks
Andre




On 6/2/20 20:08, Marc T. wrote:
> Hi all,
> 
> i just wanted to ask in the community if someone could share a
> LimeSDR-USB ue.conf for srsUE with me. I would be really interested in
> the rf, rrc and phy part - and a maybe a short note about the used
> antennas on the board itself and/or how it was connected (over the air
> or directly cabled)… actually all infos to understand why a certain
> parameter was set in the ue.conf .
> 
> After my first post
> (http://www.softwareradiosystems.com/pipermail/srslte-users/2020-January/003311.html)
> was not seen, i was still able to get it up and running with 19.06 and a
> huge effort.
> 19.12 is not working because of some asn1 decoding issues.
> 
> Today i had the first call where i was able to push some traffic, the
> connections duration was 25min before it broke.
> But i still face some lates "[WARNING] L“ 
> and other issues like 
> 
>     "/home/sml/srsLTE/lib/src/phy/mimo/precoding.c.1111: Error
>     predecoding CCD: Invalid combination of ports 2 and rx antennax 1 
>     /home/sml/srsLTE/lib/src/phy/phch/pdsch.c.927: Error predecoding“
> 
> or
> 
>     „Warning PDU queue dispatched 25 packets“
> 
> or
> 
>     „[ERROR] SetFrequencyCGEN(1.92 MHz) - cannot deliver requested frequency
>     LSet master clock rate to 491.52 MHz
>     [WARNING] Rx LPF min bandwidth is 4MHz when TIA gain is set to -12 dB
>     [INFO] RX LPF configured
>     Set Rx bandwidth to 2.50 MHz
>     [ERROR] Rx calibration: MCU error 5 (Loopback signal weak: not
>     connected/insufficient gain?)
>     [INFO] Filter calibrated. Filter order-4th, filter bandwidth set to
>     5 MHz.Real pole 1st order filter set to 2.5 MHz. Preemphasis filter
>     not active
>     [INFO] TX LPF configured
>     Set Tx bandwidth to 5.00 MHz
>     [WARNING] popping from TX, samples popped 593/1020
>     [INFO] Tx calibration finished
>     Setting manual TX/RX offset to 57 samples
>     .SoapySDRDevice_readStream returned -6: TIME_ERROR“
> 
> —> then the connection broke…
> 
> So my intention is if there are some parameter which i could improve in
> the ue.conf.
> 
> Thank you in advance,
> Marc
> 
> 
> 
> Mit freundlichen Grüßen, 
> Best regards,
> 
> Marc Triefelder
> 
> E-Mail:m.triefelder at gmail.com <mailto:m.triefelder at gmail.com> 
> 
> 
> 
> 
> 
> 
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