[PATCH] osmo-bsc[master]: Reduce T3109 from 19s to 5s

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Harald Welte gerrit-no-reply at lists.osmocom.org
Mon Dec 11 15:21:15 UTC 2017


Review at  https://gerrit.osmocom.org/5283

Reduce T3109 from 19s to 5s

T3109 is started when the BSS sends a RR CHAN REL to the MS and stops
downlink SACCH generation. Stopped when the MS successfully releases the
LAPDm link. After stop or timeout, the radio channel is released using
RSL RF CHAN REL.

Recommended values in literature are 1-2s + RadioLinkTimeout*0.48s or
5s, while we had the absurdly high 19s timeout.  This means we occupy
the radio channel way longer than needed in situations where the MS is
no longer able to properly release Layer2 (LAPDm DISC) due to loss of
signal or the like.

See also: https://osmocom.org/projects/osmobsc/wiki/Timers

Change-Id: I7416b4118e5b73c6ffb98e3546bc62a36c7a967a
Closes: OS#2734
---
M include/osmocom/bsc/gsm_data.h
1 file changed, 1 insertion(+), 1 deletion(-)


  git pull ssh://gerrit.osmocom.org:29418/osmo-bsc refs/changes/83/5283/1

diff --git a/include/osmocom/bsc/gsm_data.h b/include/osmocom/bsc/gsm_data.h
index a6c8198..ba3b217 100644
--- a/include/osmocom/bsc/gsm_data.h
+++ b/include/osmocom/bsc/gsm_data.h
@@ -266,7 +266,7 @@
 #define GSM_T3103_DEFAULT 5	/* s */
 #define GSM_T3105_DEFAULT 100	/* ms */
 #define GSM_T3107_DEFAULT 5	/* s */
-#define GSM_T3109_DEFAULT 19	/* s, must be 2s + radio_link_timeout*0.48 */
+#define GSM_T3109_DEFAULT 5	/* s, must be 2s + radio_link_timeout*0.48 */
 #define GSM_T3111_DEFAULT 2	/* s */
 #define GSM_T3113_DEFAULT 60
 #define GSM_T3115_DEFAULT 10

-- 
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Gerrit-MessageType: newchange
Gerrit-Change-Id: I7416b4118e5b73c6ffb98e3546bc62a36c7a967a
Gerrit-PatchSet: 1
Gerrit-Project: osmo-bsc
Gerrit-Branch: master
Gerrit-Owner: Harald Welte <laforge at gnumonks.org>



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