Change in osmo-bts[master]: power_control: tolerate small deviations from 'rx-target'

[fixeria]

Hello Jenkins Builder, laforge, pespin, 

I'd like you to reexamine a change. Please visit

    https://gerrit.osmocom.org/c/osmo-bts/+/20730

to look at the new patch set (#3).

Change subject: power_control: tolerate small deviations from 'rx-target'
......................................................................

power_control: tolerate small deviations from 'rx-target'

Recently we've introduced EWMA based uplink power filtering, that
should reduce Uplink power oscillations.  However, the power loop
is still quite sensitive to small deviations from the target power
level: even such an insignificant deviation like 2-5 dBm triggers
the loop to increase or decrease the MS power level.  Even if the
EWMA based filtering is enabled with 80% smoothing (alpha = 0.2).

This change introduces a new configuration parameter - 'hysteresis':

  uplink-power-target <-110-0> hysteresis <1-25>

that together with the 'uplink-power-target' defines a range:

  [target - hysteresis .. target + hysteresis]

in which the MS power loop would not trigger any power changes.

This feature is now *enabled* by default, so given that:

  - default 'uplink-power-target' is -75 dBm, and
  - default 'hysteresis' is 3 dBm,

the default target Uplink power range is: -78 dBm ... -72 dBm.

Change-Id: Iacedbd4d69d3d74e2499af5622a07a8af0423da0
Related: SYS#4916
---
M include/osmo-bts/bts.h
M src/common/bts.c
M src/common/power_control.c
M src/common/vty.c
M tests/power/power_test.c
M tests/power/power_test.err
M tests/power/power_test.ok
7 files changed, 90 insertions(+), 11 deletions(-)


  git pull ssh://gerrit.osmocom.org:29418/osmo-bts refs/changes/30/20730/3
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Gerrit-Project: osmo-bts
Gerrit-Branch: master
Gerrit-Change-Id: Iacedbd4d69d3d74e2499af5622a07a8af0423da0
Gerrit-Change-Number: 20730
Gerrit-PatchSet: 3
Gerrit-Owner: fixeria <vyanitskiy at sysmocom.de>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: laforge <laforge at osmocom.org>
Gerrit-Reviewer: pespin <pespin at sysmocom.de>
Gerrit-MessageType: newpatchset
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