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Bug #4465

Incorrect number of SUB measurements detected

Added by laforge 7 months ago. Updated 5 months ago.

Status:
Resolved
Priority:
Normal
Assignee:
Category:
osmo-bts-trx
Target version:
-
Start date:
03/20/2020
Due date:
% Done:

100%

Spec Reference:

Description

When running current osmo-trx + osmo-bts-trx I every so often get:

ERROR <0004> measurement.c:645 (bts=0,trx=0,ts=1,ss=0) Incorrect number of SUB measurements detected! (4 vs exp 3)
ERROR <0004> measurement.c:645 (bts=0,trx=0,ts=1,ss=0) Incorrect number of SUB measurements detected! (4 vs exp 3)
ERROR <0004> measurement.c:645 (bts=0,trx=0,ts=2,ss=0) Incorrect number of SUB measurements detected! (4 vs exp 3)

I was under the impression that after a lor of related effort we meanwhile do everything correctly in terms of measurement processing? The message doesn't make me very confident.


Related issues

Related to OsmoBTS - Bug #4467: bad voice quality in current osmo-bts-trx masterIn Progress03/20/2020

History

#1 Updated by laforge 7 months ago

  • Related to Bug #4467: bad voice quality in current osmo-bts-trx master added

#2 Updated by dexter 6 months ago

  • % Done changed from 0 to 80

I have checked the problem with current master. The checks of the sub frames for AMR were indeed problematic. There we would expect at least 1 SUB frame (SACCH), the remaining frames would be the result of DTX periods, which are negotiated dynamically.

However, what confuses me a bit is that the error says "(4 vs exp 3)". At least for AMR the current master currently does not implement the SUB frame tagging, so I would expect (1 vs exp 0) as error here. It would be good to know with which codec the problem occurrs and if DTX was used or not.

See also:
https://gerrit.osmocom.org/c/osmo-bts/+/17928 measurement: remove unecessary is_amr_sid_update parameter
https://gerrit.osmocom.org/c/osmo-bts/+/17929 measurement: expect at least 1 SUB frame for AMR

#3 Updated by dexter 6 months ago

  • Status changed from New to In Progress

#4 Updated by dexter 6 months ago

  • % Done changed from 80 to 90

I have now checked this more thoroughly, the SUB frames that are comming in when AMR-DTX is enabled are counted correctly. The number matches up, number of SID-FRAMES + 1 SACCH.

#5 Updated by dexter 6 months ago

The patch 17929 is still in review. However, there were also problems with the RSSI, which are now fixed, see also #2978

#6 Updated by dexter 5 months ago

  • Status changed from In Progress to Resolved
  • % Done changed from 90 to 100

17929 got merged, so the number of sub frames should now be correct.

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