[srsran-users] About the 5GNR cell search

[Johann T.]

Hi Xavier,

Many thanks for your response.
You were right, no cell was found on n78. This was expected as the 3.5 GHz
band is not yet available in NL.

I am using B210 for the test. Here is the console output. Unfortunately I
haven't got the chance to capture the spectrum.

Best regards,
Johann

-----------------------------------------------------------------------------------------------------------------------------

~/Projects/srsRAN_4G/build/srsue/src/phy/test$ ./nr_cell_search_rf --bands
20 --log_level info
Active RF plugins: libsrsran_rf_uhd.so
Inactive RF plugins:
Opening 1 channels in RF device=default with args=default
Supported RF device list: UHD file
Trying to open RF device 'UHD'
[INFO] [UHD] linux; GNU C++ version 9.2.1 20200304; Boost_107100;
UHD_3.15.0.0-2build5
[INFO] [LOGGING] Fastpath logging disabled at runtime.
Opening USRP channels=1, args: type=b200,master_clock_rate=23.04e6
[INFO] [UHD RF] RF UHD Generic instance constructed
[INFO] [B200] Detected Device: B210
[INFO] [B200] Operating over USB 3.
[INFO] [B200] Initialize CODEC control...
[INFO] [B200] Initialize Radio control...
[INFO] [B200] Performing register loopback test...
[INFO] [B200] Register loopback test passed
[INFO] [B200] Performing register loopback test...
[INFO] [B200] Register loopback test passed
[INFO] [B200] Asking for clock rate 23.040000 MHz...
[INFO] [B200] Actually got clock rate 23.040000 MHz.
RF device 'UHD' successfully opened

Warning: TX gain was not set. Using open-loop power control (not working
properly)

~/Projects/srsRAN_4G/lib/src/phy/sync/ssb.c:456: SSB Offset (1250.0 kHz)
error exceeds maximum allowed
2023-05-12T13:41:49.682703 [PHY    ] [I] [    0] Measuring SSB frequency
1.25 MHz, center 0.00 MHz
2023-05-12T13:41:49.682709 [PHY    ] [E] [    0] INTRA-NR-1250: Error
configuring SSB
~/Projects/srsRAN_4G/srsue/src/phy/test/nr_cell_search_rf.cc:258: Assertion
Failure: Fail at "intra_measure.set_config(meas_cfg)"
Aborted (core dumped)


On Fri, May 12, 2023 at 12:55 PM Xavier Arteaga <xavier.arteaga at srs.io>
wrote:

> Hi Johann,
>
> > I tried it on n78 and it ran fine.
>
> I understand that runs but no cell is found.
>
> > When I changed it to n20 (where I know there is a NSA NR cell nearby), I
> got an error (Assertion failure).
>
> Could you provide more details? Program arguments, radio device, and
> console output. Also, it would be nice if you could share a capture of the
> SS/PBCH block spectrum, I recommend using GNU Radio with Fosphor
> <https://projects.osmocom.org/projects/sdr/wiki/Fosphor>.
>
> Regards,
> Xavier
>
>
> On Fri, 12 May 2023 at 11:03, Johann T. <johann.tzt at gmail.com> wrote:
>
>> Hi Xavier,
>>
>> Does the nr_cell_search_rf also work for other bands? I tried it on n78
>> and it ran fine. When I changed it to n20 (where I know there is a NSA NR
>> cell nearby), I got an error (Assertion failure).
>>
>> Thanks in advance.
>>
>> Regards,
>> Johann
>>
>>
>>
>>
>>
>> On Tue, May 9, 2023 at 3:56 PM Xavier Arteaga <xavier.arteaga at srs.io>
>> wrote:
>>
>>> Hi Haoran,
>>> First of all, I would make sure there is an NR cell nearby and that you
>>> know its SS/PBCH center frequency of it.
>>>
>>> Secondly, I would set the center frequency to match the SS/PBCH center
>>> frequency.
>>>
>>> I recommend using nr_cell_search_rf instead of nr_cell_search_test. This
>>> one uses the SS raster for the cell search, however, it has detection
>>> problems for moderate CFO.
>>>
>>> Kind regards,
>>> Xavier
>>>
>>> On Tue, 9 May 2023 at 11:13, HAORAN WAN <wanhr at outlook.com> wrote:
>>>
>>>> Dear Developers,
>>>>
>>>> I am trying to use the srsRAN_4G to do 5gNR cell search, I used the
>>>> test codes in /srsue/phy/test/nr_cell_search_test.cc but I cannot detect
>>>> the 5g cells around me. Can you tell me what I should do?
>>>>
>>>> Best regards,
>>>> Haoran Wan
>>>> _______________________________________________
>>>> srsran-users mailing list
>>>> srsran-users at lists.srsran.com
>>>> https://lists.srsran.com/mailman/listinfo/srsran-users
>>>>
>>> _______________________________________________
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>>>
>>
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