path: root/openbsc/doc/channel_release.txt
diff options
authorHolger Hans Peter Freyther <zecke@selfish.org>2011-12-28 16:21:05 +0100
committerHolger Hans Peter Freyther <zecke@selfish.org>2012-12-23 20:20:38 +0100
commitb348939d86bbadab2b162dda00246abdfd33055a (patch)
tree4989a09e50b3153cb844552c1ac28b46e977aeaf /openbsc/doc/channel_release.txt
parent638da51a786c279cf7769afbb6fdb56cc4c6c867 (diff)
lchan: Introduce T3109 handling for the release procedure
T3109 is started when the SACCH is deactivated. It is stopped when the phones sends the DISC/UA/UM on LAPDm for the main signalling link. In case of timeout the abnormal release procedure will be initiated. Make sure to not issue the SACCH Deactivate twice to avoid confusing the equipment. This is still not fully spec compliant. In case of a timeout the abnormal release handling will be started which involves starting T3111+2. The error handling should be split out of the rf channel release method, e.g. lchan_release should be called and check if the channel release was already initiated.
Diffstat (limited to 'openbsc/doc/channel_release.txt')
1 files changed, 2 insertions, 1 deletions
diff --git a/openbsc/doc/channel_release.txt b/openbsc/doc/channel_release.txt
index bd707b451..c9cdfebca 100644
--- a/openbsc/doc/channel_release.txt
+++ b/openbsc/doc/channel_release.txt
@@ -61,7 +61,8 @@ chan_alloc.c:lchan_release(chan, sacch_deactivate, reason)
* Release all SAPI's > 0 as local end (The BTS should send a
REL_CONF a message)
* Send SACH Deactivate on SAPI=0 if required.
- * It should start T3109 but it does not.
+ * Start T3109 (stop it when the main signalling link is disconnected)
+ or when the channel released. On timeout start the error handling.
* abis_rsl.c schedules the RSL_MT_RF_CHAN_REL once all SAPI's are
released and after T3111 has timed out or there is an error.