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Bug #3653

FACCH/H sometimes not received by BTS with osmocomBB+motorolaCXX

Added by pespin about 1 month ago. Updated 24 days ago.

Status:
New
Priority:
Normal
Assignee:
-
Category:
OsmocomBB HW Drivers
Target version:
-
Start date:
10/15/2018
Due date:
% Done:

0%

Resolution:
Spec Reference:

Description

While working on support to run TTCN3 BTS_Tests with real HW (motorola phone + osmo-bts-trx + osmo-trx + B200) (#3155), it was spotted that several tests (a51 and a52 for f_TC_encr_cmd and f_TC_chan_act_encr) fail while trying to send some UNIT DATA (MS->BTS) using a configured FACCH/H channel. Test fails most of the time but not always.

Those tests actually run same procedures several times but with a different set of channel configs (f_testmatrix_each_chan). It first runs using TCH/H (FACCH/F) and that one is successful, but then during second round, where it uses TCH/H (FACCH/H) it fails most of the times.

Same test running in virtual TTCN3 setup with TRXCON seems to be passing always fine.

09:43:01.047017 450 BTS_Tests.ttcn:3793 Timeout T: 3 s
09:43:01.047367 450 BTS_Tests.ttcn:3794 setverdict(fail): pass -> fail reason: "Timeout waiting for DATA_IND", new component reason: "Timeout waiting for DATA_IND" 

See https://osmocom.org/issues/3155#note-55 (55 to 59) for more information.

History

#1 Updated by pespin 24 days ago

For now I'll disable FACCH/H related testing when using real HW (no trxcon):
https://gerrit.osmocom.org/#/c/osmo-ttcn3-hacks/+/11428 bts: Disable testing FACCH/H with real HW

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