Feature #5475
closedSupport configuring counter Ny1
100%
Description
src/osmo-bsc/bts_ipaccess_nanobts_omlattr.c nanobts_attr_bts_get():
/* 10 milliseconds */
msgb_tv_put(msgb, NM_ATT_BTS_AIR_TIMER, osmo_tdef_get(bts->network->T_defs, 3105, OSMO_TDEF_MS, -1)/10);
/* 10 retransmissions of physical config */
msgb_tv_put(msgb, NM_ATT_NY1, 10); //<---- THIS IS RIGHT NOW HARDCODED
Right now, we allow configuring "T3105", but "Ny1" counter is hardcoded to 10. This is bad, because Ny1 needs to be adapted also based on T3105.
T3105 sets how often we reschedule a "Physical Information" message, eg sent BTS->MS during an incoming handover access.
Ny1 sets how many "Physicial information" messages are sent, aka how many times T3105 is rearmed before stopping.
If T3105 is set to low values (meaning it will retransmit quite quickly), the Ny maybe adapter to higher values to keep retrying for the same amount of time.
See some further explanations here: https://pcstelconext.wordpress.com/2011/05/02/2g-timer-explanations/ , grep for "T3105" and "Ny1" (4.10.3 IV. Precautions)
See also 3GPP TS 04.08 section 11.1.2 "Timers on the network side". Specially important when looking for a good T3105 default value candiate:
NOTE 3: This timer may be set to such a low value that the message is in fact continuously transmitted.
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