[srslte-users] Problems to find SIB messages

[Edward Johnson]

Hi everyone,

first of all, I would like to thanks all of you for the work and support
you provide!
I've a problem that I cannot figure out: I've try to see other SIB messages
broadcasted by a real cell around me. So I started from cell_measurement.c
example and I was able to correctly find and decode (using
https://www.marben-products.com/decoder-asn1-lte/ as someone suggested in
others emails) SIB1. Following the decoded result, I expect the following
SIBs:
<schedulingInfoList>
  <SchedulingInfo>
    <si-Periodicity>
      <rf8/>
    </si-Periodicity>
    <sib-MappingInfo>
      <sibType3/>
    </sib-MappingInfo>
  </SchedulingInfo>
  <SchedulingInfo>
    <si-Periodicity>
      <rf16/>
    </si-Periodicity>
    <sib-MappingInfo>
      <sibType5/>
    </sib-MappingInfo>
  </SchedulingInfo>
  <SchedulingInfo>
    <si-Periodicity>
      <rf64/>
    </si-Periodicity>
    <sib-MappingInfo>
      <sibType6/>
    </sib-MappingInfo>
  </SchedulingInfo>
  <SchedulingInfo>
    <si-Periodicity>
      <rf64/>
    </si-Periodicity>
    <sib-MappingInfo>
      <sibType7/>
    </sib-MappingInfo>
  </SchedulingInfo>
</schedulingInfoList>
<si-WindowLength>
  <ms10/>
</si-WindowLength>

And I easily find SIB2, SIB5, SIB6 and SIB7 but...no SIB3 messages.
What I've do, was a little modification in cell_measurement.c:
Original:

if ((srslte_ue_sync_get_sfidx(&ue_sync) == 5 && (sfn%2)==0)

Modified:

if (srslte_ue_sync_get_sfidx(&ue_sync) == subframe &&
    (sfn % periodicity) == X/10)

where,
X = (sib_searched-1) * window_len;
subframe = X %10;

I've tried to comment the conditional statement and print all messages but
even in that case I didn't find SIB3.
After that, I've tried with another cell and the results were even worse:
from 6 SIB messages (2,3,5,6,7 and 8), I was able to find only 3 of them
(2,3 and 5).
What are my mistakes? What I did not understand?

Thanks in advice,
Edward Johnson
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