tbf: Set MS timeout

This commit sets the MS timeout when the MS object is created. The
value is taken from the ms_idle_sec field in gprs_rlcmac_bts which
can be changed by the VTY commands shown below.

The following VTY commands are added to the config-pcu node:

- ms-idle-time <1-7200>      Set the timeout in seconds
- no ms-idle-time            Disable the timeout

Another timer that is related is T3314 (Ready Timer, default 44s, GSM
24.008, 11.2.2) which requires the SGSN to use paging after its
expiry. Longer timeouts can help if adaptive coding scheme selection
is used (not yet implemented). On the other hand, measurement values
(TA, signal quality) can get invalid after some time, especially with
a moving MS. So a value slightly above T3314 is probably a good value
to start with.

Sponsored-by: On-Waves ehf

1 files changed, 3 insertions, 1 deletions

diff --git a/src/tbf.cpp b/src/tbf.cpp
index 53f1ae13..8501b161 100644
--- a/src/tbf.cpp
+++ b/src/tbf.cpp
@@ -126,8 +126,10 @@ void gprs_rlcmac_tbf::update_ms(uint32_t tlli, enum gprs_rlcmac_tbf_direction di
 {
 	if (!ms()) {
 		GprsMs *new_ms = bts->ms_store().get_ms(tlli);
-		if (!new_ms)
+		if (!new_ms) {
 			new_ms = bts->ms_store().create_ms(tlli, dir);
+			new_ms->set_timeout(bts->bts_data()->ms_idle_sec);
+		}
 
 		if (dir == GPRS_RLCMAC_UL_TBF)
 			new_ms->set_ta(m_ta);