[srslte-users] Prach UE in srsLTE

[Ismael Gomez]

Thank you German, using that equipment will be very useful.

On Mon, 5 Oct 2015 at 10:37 Germán Corrales Madueño <gco at es.aau.dk> wrote:

> Hi Ismael,
>
> Thanks for the quick update.  I will more than happy to give feedback
> about srsLTE and Open Air.
> FYI: I might have access to a R&S®CMW500 LTE eNodeB emulator, which
> includes RF Measurements tests.
> For example for the PRACH:
> http://cdn.rohde-schwarz.com/pws/dl_downloads/dl_application/application_notes/1cm94/1CM94_5e_LTE_UE_RF_Meas_TS36121-1.pdf
> (Section 2.9.1).
>
> We are planning to use srsLTE to validate some of our algorithms for the
> access reservation procedure. It would be great if you can release the
> Preamble + RAR as soon as it is ready :)
>
> Thanks,
> Germán
>
> 2015-10-05 9:34 GMT+02:00 Ismael Gomez <
> ismael.gomez at softwareradiosystems.com>:
>
>> Hi German,
>>
>> Unfortunately the prach_ue example is not working properly and is not
>> being currently maintained. I will remove it from the current master
>> branch.
>>
>> In a few weeks we will release a complete UE (srsUE) capable to attach
>> and register an eNodeB and establish an IP session.
>>
>> We do our internal tests with the Amarisoft LTE eNodeB only, thus we'd
>> love to have your feedback if you can test it with the Eurecom Open Air
>> eNodeB.
>>
>> Thanks for your valuable contribution,
>> Ismael
>>
>> On Fri, 2 Oct 2015 at 17:35 Germán Corrales Madueño <gco at es.aau.dk>
>> wrote:
>>
>>> Hello,
>>>
>>> I'm running OpenAirInterface LTE eNodeB at 2.66GHz with 25RBs and the
>>> following PRACH Configuration:
>>>
>>>         prach_root                                = 0;
>>>>         prach_config_index                        = 0;
>>>>         prach_high_speed                          = "DISABLE";
>>>>         prach_zero_correlation                    = 1;
>>>>         prach_freq_offset                         = 2;
>>>>
>>>> Meaning that preamble format used is 0 (0.9 ms). If I try to use
>>> prach_ue example with:
>>>
>>> $  sudo ./prach_ue -f 2660000000 -F 2540000000 -p 2 -v
>>>>
>>>
>>>
>>> the cell is detected and preamble is transmitted:
>>>
>>>  Setting sampling rate 5.76 MHz
>>>>  - Cell ID:         0     1.8, FrameCnt: 0, State: 1
>>>>  - Nof ports:       1
>>>>  - CP:              Normal
>>>>  - PRB:             25
>>>>  - PHICH Length:    Normal
>>>>  - PHICH Resources: 1/6
>>>>  - SFN:             84
>>>> Decoded MIB. SFN: 84, offset: 1
>>>> Send prach sfn: 85. Last frame time = 11.728130, send prach time =
>>>> 11.738130
>>>> Looking for RAR in sfn: 86 sf_idx: 4
>>>>
>>>>
>>> However no RAR is received, which is to be expected since the eNB does
>>> not detect preamble activity. When I looked into the output signal of the
>>> UE (srsLTE) in the spectrum analyzer, I could see the envelope spanning for
>>> almost 8ms (8x times longer than expected). Image below...
>>>
>>> [image: Imágenes integradas 1]
>>> Envelope View: http://pasteboard.co/14TY5GgX.png
>>> Spectrum View: http://pasteboard.co/14TO4mot.png
>>>
>>> Next week I will look into the code, but I would be nice to know if
>>> prach_ue is operational.
>>>
>>> Thanks,
>>> Germán
>>> _______________________________________________
>>> srslte-users mailing list
>>> srslte-users at lists.softwareradiosystems.com
>>> http://www.softwareradiosystems.com/mailman/listinfo/srslte-users
>>>
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.srsran.com/pipermail/srsran-users/attachments/20151006/e967b230/attachment.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: srsLTE_Preamble.PNG
Type: image/png
Size: 19698 bytes
Desc: not available
URL: <https://lists.srsran.com/pipermail/srsran-users/attachments/20151006/e967b230/attachment.png>