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Bug #1622
closedOsmoBTS power control incompliant to TS 05.08 and TS 08.58
Start date:
02/23/2016
Due date:
% Done:
100%
Spec Reference:
Description
The way how OsmoBTS interprets the A-bis RSL information elements regarding MS and BS power control is wrong.
For a description of the current behavior, see http://openbsc.osmocom.org/trac/wiki/GsmPowerControl
Furthermore, even the actual power control loop is completely simplistic, results in oscillations and doesn't implement any of the configurable averaging as specified in TS 05.08.
What needs to be done is:
correctly parse and interpret the various MS / BS power related IEs on RSL
implement Annex A of TS 05.08 (measurement averaging, MS power control)
Checklist
- fix behavior on BSC side (always send MS power parameters in RSL CHAN ACT)
- fix behavior on BTS side: autonomous UL power control ony if MS power parametrs IE was sent
- TTCN3 tests for static MS power level in RSL CHAN ACT
- TTCN3 tests for static MS power level in MS POWER CONTROL
- TTCN3 test for autonomous MS power control after RSL CHAN ACT
- TTCN3 test for autonomous MS power control after MS POWER CONTROL
- Ensure the ms power level is actually interpreted as the maximum allowable power level if a ms power parameters IE is present
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