Cellular Network Infrastructure » Radio Access Network » OsmoBSC

Like any GSM network, we do have parameters such as rach max retransmission and rach tx integer that influence the RACH load (and RACH/IMM-ASS delay).

Users on lightly loaded networks with few users need different defaults than users o highly [over]loaded cells.

• http://gsm-optimization.blogspot.de/2012/04/tx-integer.html for some general recommendations + rationale
• http://lists.osmocom.org/pipermail/openbsc/2009-December/002366.html for the OsmoBSC defaults + rationale
• GSM TS 04.08 section 3.3.1.1.2 and 10.5.2.29

• higher tx-integer will be better for high-load, but will increase the delay of a MS getting any channel
• higher max-retransmissions means higher rach-load on the cell as the MS will make more re-tries. However, higher chance that it will get through, even in adverse radio conditions.

Let's make sure we give proper advice to our users.