[srslte-users] Prach UE in srsLTE

[Germán Corrales Madueño]

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
>>
>
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