Feature #2722
document RACH tuning parameters more thoroughly, give explanations
Start date:
12/08/2017
Due date:
% Done:
100%
Spec Reference:
Description
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.
See also:- 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.
Related issues
History
#1 Updated by laforge almost 3 years ago
- Related to Feature #2591: ramp up cell slowly based on access control class to avoid severe RACH/SDCCH overload added
#2 Updated by laforge almost 3 years ago
- Related to Feature #1611: be more efficient in batching IMMEDIATE ASSIGN REJECT messages added
#3 Updated by laforge almost 3 years ago
- Related to Feature #2592: Use "waiting time" of IMMEDIATE ASSIGN REJECT added
#4 Updated by laforge over 2 years ago
- Related to Feature #2893: automatic simulator for large LU load added
#5 Updated by laforge over 2 years ago
- Assignee changed from sysmocom to daniel
#6 Updated by daniel about 2 years ago
- Priority changed from Normal to High
