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Bug #3474

SDCCH not released if Radio Link Failure / Sending Connection Failure: cause = 0x001 Experienced in osmo-bsc and osmo-bts-trx

Added by ron.menez@entropysolution.com about 1 year ago.

Status:
New
Priority:
Normal
Assignee:
-
Category:
-
Target version:
-
Start date:
08/20/2018
Due date:
% Done:

0%

Spec Reference:

Description

Encountered an issue regarding the SDCCH channel not being released immediately after a "Radio Link Failure" is detected in osmo-bsc and an equivalent error of "Sending Connection Failure: cause = 0x01" in osmo-bts-trx.

Error in osmo-bts-trx:
<0000> rsl.c:797 (bts=0,trx=0,ts=0,ss=0) Sending Connection Failure: cause = 0x01

Error in osmo-bsc:
<0003> abis_rsl.c:1372 (bts=0,trx=0,ts=0,ss=0) CONNECTION FAIL in state ACTIVE CAUSE=0x01(Radio Link Failure)

With this issue, the SDCCH channel will then be exhausted and no other subscriber can attach and do any services (call and SMS).

Below are the versions of OSMO-BSC, OSMO-BTS-TRX, OSMO-TRX, and OSMO-MSC.

OsmoBSC# show version
OsmoBSC 1.2.1.91-3ff7 (OsmoBSC).
Copyright (C) 2008-2018 Harald Welte, Holger Freyther
Contributions by Daniel Willmann, Jan Lübbe, Stefan Schmidt
Dieter Spaar, Andreas Eversberg, Sylvain Munaut, Neels Hofmeyr

License AGPLv3+: GNU AGPL version 3 or later <http://gnu.org/licenses/agpl-3.0.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

===============================================

OsmoBTS# show version
OsmoBTS 0.8.1.35-6575f0 (OsmoBTS).
Copyright (C) 2010, 2011 by Harald Welte, Andreas Eversberg and On-Waves
License AGPLv3+: GNU AGPL version 3 or later <http://gnu.org/licenses/agpl-3.0.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

===============================================

OsmoTRX# show version
OsmoTRX 0.4.0 (OsmoTRX).
Copyright (C) 2007-2014 Free Software Foundation, Inc.
Copyright (C) 2013 Thomas Tsou <>
Copyright (C) 2015 Ettus Research LLC
Copyright (C) 2017-2018 by sysmocom s.f.m.c. GmbH <>
License AGPLv3+: GNU AGPL version 3 or later <http://gnu.org/licenses/agpl-3.0.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

===============================================

OsmoMSC# show version
OsmoMSC 1.2.0.20-2798 (OsmoMSC).
OsmoMSC - Osmocom Circuit-Switched Core Network implementation
Copyright (C) 2016 by sysmocom s.f.m.c. GmbH <>
Based on OsmoNITB:
(C) 2008-2010 by Harald Welte <>
(C) 2009-2012 by Holger Hans Peter Freyther <>
Contributions by Daniel Willmann, Jan Lübbe, Stefan Schmidt
Dieter Spaar, Andreas Eversberg, Sylvain Munaut, Neels Hofmeyr

License AGPLv3+: GNU AGPL version 3 or later <http://gnu.org/licenses/agpl-3.0.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

OS used: UBUNTU 16.04.

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