[srslte-users] Commercial eNodeB

Fri Aug 30 13:51:00 UTC 2019

I've been playing with the gain, and I'm still having no luck decoding the
PDSCH.  I'm going to try some other locations, tomorrow, but here are the
results of my latest attempt:

I attached ue.log, and here is the console output:
Reading configuration file lime.conf...

Built in Release mode using commit 5343b33f on branch master.

---  Software Radio Systems LTE UE  ---

Opening 1 RF devices with 1 RF channels...
[INFO] [UHD] linux; GNU C++ version 7.4.0; Boost_106501;
UHD_3.15.0.git-58-gea06c70f
[INFO] [LOGGING] Fastpath logging disabled at runtime.
Warning: Failed to create thread with real-time priority. Creating it with
normal priority: Success
Warning: Failed to create thread with real-time priority. Creating it with
normal priority: Success
Warning: Failed to create thread with real-time priority. Creating it with
normal priority: Success
Warning: Failed to create thread with real-time priority. Creating it with
normal priority: Success
Opening USRP with args:
Error opening UHD: code 11
Soapy has found device #0: addr=24607:1027, driver=lime, label=LimeSDR Mini
[USB 3.0] 1D4C463E946EFC, media=USB 3.0, module=FT601, name=LimeSDR Mini,
serial=1D4C463E946EFC,
[INFO] Make connection: 'LimeSDR Mini [USB 3.0] 1D4C463E946EFC'
[INFO] Reference clock 40.00 MHz
[INFO] Device name: LimeSDR-Mini
[INFO] Reference: 40 MHz
[INFO] LMS7002M calibration values caching Disable
Setting up Rx stream with 1 channel(s)
Setting up Tx stream with 1 channel(s)
[INFO] RX LPF configured
Set Rx bandwidth to 2.50 MHz
[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
Available device sensors:
 - clock_locked
 - lms7_temp
Available sensors for Rx channel 0:
 - lo_locked
[ERROR] Tx Calibration: MCU error 4 (SXT tune failed)
[INFO] Rx calibration finished
State of gain elements for Rx channel 0 (AGC not supported):
 - TIA: 0.00 dB
 - LNA: 30.00 dB
 - PGA: -12.00 dB
State of gain elements for Tx channel 0 (AGC not supported):
 - TIA: 0.00 dB
 - LNA: 30.00 dB
 - PGA: -12.00 dB
Rx antenna set to LNAH
Tx antenna set to BAND1

Warning burst preamble is not calibrated for device lime_mini. Set a value
manually

Waiting PHY to initialize...
...
Attaching UE...
Searching cell in DL EARFCN=5110, f_dl=739.0 MHz, f_ul=709.0 MHz
[INFO] Selected RX path: LNAW
[INFO] Selected TX path: Band 2
[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
[INFO] Rx calibration finished
[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
[INFO] Tx calibration finished

Warning TX/RX time offset has not been calibrated for device lime_mini. Set
a value manually

.
Found Cell:  Mode=FDD, PCI=371, PRB=50, Ports=2, CFO=-0.6 KHz
Set master clock rate to 11.52 MHz
[INFO] RX LPF configured
Set Rx bandwidth to 8.64 MHz
SoapySDRDevice_readStream returned -6: TIME_ERROR
SYNC:  Receiving from radio while in IDLE_RX
[INFO] Rx calibration finished
[INFO] Filter calibrated. Filter order-4th, filter bandwidth set to 8.64
MHz.Real pole 1st order filter set to 2.5 MHz. Preemphasis filter not active
[INFO] TX LPF configured
Set Tx bandwidth to 8.64 MHz
[INFO] Tx calibration finished

Warning TX/RX time offset has not been calibrated for device lime_mini. Set
a value manually

Invalid inputs rv_idx=-1, cb_idx=30
Invalid inputs rv_idx=-1, cb_idx=30
Invalid inputs rv_idx=-1, cb_idx=30
Invalid inputs rv_idx=-1, cb_idx=30
Invalid inputs rv_idx=-1, cb_idx=30
Invalid inputs rv_idx=-1, cb_idx=30
Invalid inputs rv_idx=-1, cb_idx=30
Invalid inputs rv_idx=-1, cb_idx=30
Invalid inputs rv_idx=-1, cb_idx=30
Invalid inputs rv_idx=-1, cb_idx=30
Invalid inputs rv_idx=-1, cb_idx=30
Invalid inputs rv_idx=-1, cb_idx=30
Invalid inputs rv_idx=-1, cb_idx=30
Invalid inputs rv_idx=-1, cb_idx=30
Invalid inputs rv_idx=-1, cb_idx=30
Invalid inputs rv_idx=-1, cb_idx=30
Invalid inputs rv_idx=-1, cb_idx=30
Invalid inputs rv_idx=-1, cb_idx=30
Invalid inputs rv_idx=-1, cb_idx=30
Invalid inputs rv_idx=-1, cb_idx=30
Invalid inputs rv_idx=-1, cb_idx=30
Invalid inputs rv_idx=-1, cb_idx=30
Invalid inputs rv_idx=-1, cb_idx=30
Invalid inputs rv_idx=-1, cb_idx=30
Invalid inputs rv_idx=-1, cb_idx=30
Invalid inputs rv_idx=-1, cb_idx=30
Invalid inputs rv_idx=-1, cb_idx=30
Invalid inputs rv_idx=-1, cb_idx=30s

... REPEATS ...

On Wed, Aug 28, 2019 at 3:35 PM Andre Puschmann <
andre.puschmann at softwareradiosystems.com> wrote:

> Mark,
>
> we haven't tested the Lime Mini ourselves but have heard good stories
> from other users. We've tested with the normal Lime and this works fine.
> In general, the Lime works better in the sub GHz frequencies. Using the
> default LTE rates is a good idea. Lime calibration is done automatically
> in the newer LimeSuite versions.
>
> You are likely having gain issues. Try to play with the Rx gain settings
> in your case and send a log and/or console trace if it still doesn't
> pick up the cell.
>
> Cheers
> Andre
>
>
>
> On 16/8/19 19:50, Mark S wrote:
> > I am trying to use a low-cost SDR to attach (legitimately) to a
> > commercial eNodeB.  I don't care about speed or throughput, I just want
> > to reliably attach.
> >
> > My low-cost SDR of choice is the LimeSDR Mini.  As far as I can tell,
> > the Lime Mini is designed for LTE, with its 30.72 MHz sample rate, and
> > high-precision TCVCXO, and I was expecting pdsch_ue and srsue to work
> > out-of-the-box.  However, pdsch_ue has an enormous miss rate, and srsue
> > isn't even getting past the SIB decode stage.
> >
> > Am I entirely off-base for believing that srsLTE + Lime Mini can support
> > this function?  Do you guys have any tips or notes on a viable Lime MIni
> > setup?
> >
> > Thank you,
> >
> > Mark
> >
> >
> > _______________________________________________
> > srslte-users mailing list
> > srslte-users at lists.softwareradiosystems.com
> > http://www.softwareradiosystems.com/mailman/listinfo/srslte-users
> >
>
>
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