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Reduce T3109 default 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
This commit is contained in:
Harald Welte 2017-12-10 19:58:16 +01:00
parent f93b31a5a7
commit ed23c1d83d
1 changed files with 1 additions and 1 deletions
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2
include/osmocom/bsc/gsm_data.h
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@ -197,7 +197,7 @@ static const struct rate_ctr_group_desc bsc_ctrg_desc = {
#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 10 /* s */
#define GSM_T3115_DEFAULT 10