Bug #4465
closedIncorrect number of SUB measurements detected
100%
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
Updated by laforge about 4 years ago
- Related to Bug #4467: bad voice quality in current osmo-bts-trx master added
Updated by dexter almost 4 years 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
Updated by dexter almost 4 years 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.
Updated by dexter almost 4 years ago
The patch 17929 is still in review. However, there were also problems with the RSSI, which are now fixed, see also #2978
Updated by dexter almost 4 years 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.
