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

Marc T. m.triefelder at gmail.com
Fri Feb 7 21:21:55 UTC 2020 

Hi Andre,

thank you for your reply.

In my first post i made a mistake with the device_args for the LimeSDR; i used rxant=LNAH,txant=BAND2 which was wrong, as i used the physical BAND1 antenna on the LimeSDR Board itself. After i changed from BAND2 -> BAND1 in the ue.conf i was able to send tx so the attach was possible (more or less).

Anyway, In general it would be interesting what other srsUE users set for the following parameters in combination with a LimeSDR-USB.  
Unfortunately there is no best practice available (if i get this stable one day, then i ll write a post which you can publish for the LimeSDR-USB :-) )
[rf]
freq_offset = 0
tx_gain = 70
#rx_gain = 38
#nof_radios = 1
#nof_rx_ant = 2
#nof_rf_channels = 2

device_name = soapy
# LIME SDR
device_args = rxant=LNAH,txant=BAND1
# URSP N210 (not supported)
#device_args = num_recv_frames=64,num_send_frames=64
#time_adv_nsamples = auto
# test value
# 27 was working; 57 also
time_adv_nsamples = 57
#burst_preamble_us = auto
#continuous_tx     = auto

[rrc]
ue_category       = 2
release           = 8

[phy]
—> anything in here?



But as suggested i reduced the bandwidth of the cell, i was able to reduce it to 15MHz (could go lower, but 15MHz is the target to reach for my project).
—> Now i see less lates, no overruns or underruns. 
I also want to mention that i got more stable results with srsUE after i used the ubuntu 18.04. low latency kernel and after disabling all CPU power save options in BIOS or via the cpu govenor (performance) .
This might be helpful for others. 


But i still face some issues, here are three new examples:

A) 2020-02-07_17-10-29_asn1-decoding-failure_*:
	this was a run where i wasn’t able to attach and i got decoding errors for the asn1 - but at that time the cell was still at 20MHz (but it was happen also already for a 15MHz bandwidth)

RRC Connected
Buffer size limit was achieved
The provided enum is not within the range of possible values (48>=8)
[/home/sml/srsLTE/lib/include/srslte/asn1/asn1_utils.h][753] Decoding failure.
[/home/sml/srsLTE/lib/src/asn1/rrc_asn1.cc][75441] Decoding failure.
[/home/sml/srsLTE/lib/src/asn1/rrc_asn1.cc][77974] Decoding failure.
[/home/sml/srsLTE/lib/src/asn1/rrc_asn1.cc][77914] Decoding failure.
[/home/sml/srsLTE/lib/src/asn1/rrc_asn1.cc][77803] Decoding failure.
[/home/sml/srsLTE/lib/src/asn1/rrc_asn1.cc][78664] Decoding failure.
[/home/sml/srsLTE/lib/src/asn1/rrc_asn1.cc][78286] Decoding failure.
[/home/sml/srsLTE/lib/src/asn1/rrc_asn1.cc][78705] Decoding failure.
Received RRC Connection Release

or

Long small integers not supported
The provided enum is not within the range of possible values (8>=8)
[/home/sml/srsLTE/lib/include/srslte/asn1/asn1_utils.h][753] Decoding failure.
[/home/sml/srsLTE/lib/src/asn1/rrc_asn1.cc][75441] Decoding failure.
[/home/sml/srsLTE/lib/src/asn1/rrc_asn1.cc][77974] Decoding failure.
[/home/sml/srsLTE/lib/src/asn1/rrc_asn1.cc][77914] Decoding failure.
[/home/sml/srsLTE/lib/src/asn1/rrc_asn1.cc][77803] Decoding failure.
[/home/sml/srsLTE/lib/src/asn1/rrc_asn1.cc][78664] Decoding failure.
[/home/sml/srsLTE/lib/src/asn1/rrc_asn1.cc][78286] Decoding failure.
[/home/sml/srsLTE/lib/src/asn1/rrc_asn1.cc][78705] Decoding failure.
Received RRC Connection Release
RRC IDLE
or

The condition lb <= n <= ub (0 <= 15 <= 9) was not met
[/home/sml/srsLTE/lib/include/srslte/asn1/asn1_utils.h][753] Decoding failure.
[/home/sml/srsLTE/lib/src/asn1/rrc_asn1.cc][255] Decoding failure.
[/home/sml/srsLTE/lib/src/asn1/rrc_asn1.cc][74093] Decoding failure.


b) 2020-02-07_20-58-28_15MHz-criticalExtensions-invalid-field-access_*
during this run srsUE showed me a successful attach, tun_srsue was created, but traffic was no possible.
…
Network attach successful. IP: 10.20.10.17
SmartMobileLabs (SmartMobileLabs)
Received RRC Connection Release
RRC IDLE
Random Access Transmission: seq=10, ra-rnti=0x2
Random Access Complete.     c-rnti=0xd377, ta=6
RRC Connected
Received RRC Connection Release
RRC IDLE
Random Access Transmission: seq=31, ra-rnti=0x2
Random Access Complete.     c-rnti=0x6f46, ta=6
RRC Connected
Received RRC Connection Release
RRC IDLE
Random Access Transmission: seq=20, ra-rnti=0x2
Random Access Complete.     c-rnti=0xb15, ta=6
RRC Connected
Invalid field access for choice type "criticalExtensions" ("c1"!="criticalExtensionsFuture")
Invalid field access for choice type "criticalExtensions" ("c1"!="criticalExtensionsFuture")

^CStopping srsUE... Press Ctrl+C 9 more times to force stop
Scheduling request failed: releasing RRC connection...
Random Access Transmission: seq=23, ra-rnti=0x2
Random Access Transmission: seq=13, ra-rnti=0x2
Random Access Transmission: seq=25, ra-rnti=0x2
Random Access Transmission: seq=18, ra-rnti=0x2
Random Access Transmission: seq=9, ra-rnti=0x2
Random Access Transmission: seq=12, ra-rnti=0x2
Random Access Transmission: seq=23, ra-rnti=0x2
Random Access Transmission: seq=12, ra-rnti=0x2
Random Access Transmission: seq=7, ra-rnti=0x2
Random Access Transmission: seq=10, ra-rnti=0x2
Warning: Detected Radio-Link Failure
RRC Connection Reestablishment
Random Access Transmission: seq=21, ra-rnti=0x2
Random Access Complete.     c-rnti=0xbcfa, ta=12
Reestablishment Reject
RRC IDLE
Saving MAC PCAP file
Saving NAS PCAP file
[WARNING] popping from TX, samples popped 489/1020
[WARNING] L
[WARNING] popping from TX, samples popped 0/1020
#other_errors=1
---  exiting  ---



c) 2020-02-07_21-04-59_15MHz-successfull-attach-with-trafffic-and-issues_*
this attempt was quite successful but the connected lasted not long.
even though i saw a lot of 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
the connection/attach was working for some min. then the connection dropped.



All the files can be found here; i set the log level to debug so especially the ue.log files grow quite fast. Even compressed the files are too big to send them via E-Mail.
the files ending with *_ue-out.txt is a copy of the stdout from running srsUE. In this shared folder you will also find the complete ue.conf that i use with srsUE19.06.
https://drive.google.com/drive/folders/1HiGOV3mIsaI0eAXbYL9BIIk25XbMFhmA?usp=sharing <https://drive.google.com/drive/folders/1HiGOV3mIsaI0eAXbYL9BIIk25XbMFhmA?usp=sharing> (read only)


Here you will also find the the requested files from the 25min long connection of yesterday; 
files names starting with 2020-02-06_18-21-41_LowLatencyKerner_1st-longrun-w-traffic_*
Still, this test was done with 20MHZ cell bandwidth.

I will appreciate every comment/help to get the srsue a bit more stable/reliable!

Tanke you very much in advance,
Marc


Mit freundlichen Grüßen, 
Best regards,

Marc Triefelder

E-Mail:	m.triefelder at gmail.com 





> Am 06.02.2020 um 21:01 schrieb Andre Puschmann <andre.puschmann at softwareradiosystems.com>:
> 
> 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> 
>> 
>> 
>> 
>> 
>> 
>> 
>> _______________________________________________
>> srslte-users mailing list
>> srslte-users at lists.softwareradiosystems.com
>> http://www.softwareradiosystems.com/mailman/listinfo/srslte-users

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