[srslte-users] srsue crc ko when decoding PDSCH

[Ismael Gomez]

Hi Cesar,

Apparently it decodes SIB1 successfully but not SIB2. Have you tried with
different system BW? Can you change the SIB2 scheduling? There could be a
bug in how the scheduling (or rv index for instance) is calculated, but I
did the manual calculations and seems ok:

It seems like SIB2 is scheduled with window 20 ms and period 8 frames. It
looks like the eNodeB transmits SIB2 on subframe 15 of the window then
according to 5.3.1 in 36.321 k=15 mod 4 = 1 and rv=ceil(3/2*k) mod 4 = 1.
Am I right?

Can you try with some different parameters and see if it works? Or can you
tell from the eNodeB which is the real SIB2 scheduling and with which rv
idx?

Also, just out of curiosity, what commercial BS you have been able to
connect to? You mean from real LTE commercial networks or in lab
environment?

Thanks and best regards,

Ismael

On Thu, 17 Mar 2016 at 15:08 César Augusto García Pérez <
garciacesaraugusto at lcc.uma.es> wrote:

> Hi,
>
> First of all congratulations and thanks for the project, it is really
> cool.
>
> I'm running some tests with srsUE over an USRP B210 connecting to
> conformance equipment by Keysight
> (
> http://www.keysight.com/en/pd-2219656-pn-T4110S/lte-protocol-test-system?nid=-35141.1039393&cc=ES&lc=eng
> and
> http://www.home.agilent.com/agilent/campaign.jspx?cc=ES&lc=spa&ckey=2421060&id=2421060&cmpid=zzfinduxm)
> but I get an error after receiving the SIB1 message (I have attached the
> traces):
>
> 13:48:50.102 [PHY ] Info    [00175] PDSCH: l_crb= 3, harq=0, tbs=32,
> mcs=8, rv=1, crc=KO, snr=14.1 dB, n_iter=4, dec_time=  25 us
>
> Any hints on what could be the problem? I am also trying with commercial
> BS by operators and it goes further (it get the SIB2 and sometimes reach
> RRC Connected).
>
> Thank you very much, best regards,
> César
>
> --
> César Augusto García Pérez
> Mobile Networks and Software Reliability Lab
> Universidad de Málaga
> http://morse.uma.es
> Tel.: (+34) 9519 52965_______________________________________________
> srslte-users mailing list
> srslte-users at lists.softwareradiosystems.com
> http://www.softwareradiosystems.com/mailman/listinfo/srslte-users
>
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