Change in osmo-bts[master]: osmo-bts-trx: implement BCCH carrier power reduction mode

[fixeria]

Hello Jenkins Builder, pespin, 

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

    https://gerrit.osmocom.org/c/osmo-bts/+/24776

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

Change subject: osmo-bts-trx: implement BCCH carrier power reduction mode
......................................................................

osmo-bts-trx: implement BCCH carrier power reduction mode

The BCCH carrier (sometimes called C0) of a BTS shall maintain
discontinuous Downlink transmission at full power in order to
stay 'visible' to the mobile stations.  Because of that, early
versions of 3GPP TS 45.008 prohibited BS power reduction on C0.

However, in the recent 3GPP TS 45.008 there is a feature called
'BCCH carrier power reduction operation'.  This is a special
mode of operation, where the variation of RF level for some
timeslots is relaxed for the purpose of energy saving.

In BCCH carrier power reduction operation, for timeslots on the
C0 carrier, except timeslots carrying BCCH/CCCH, the output power
may be lower than the output power used for timeslots carrying
BCCH/CCCH.  In this case the maximum allowed difference in output
power actually transmitted by the BTS is 6 dB.

The power reduction operation can be controlled by the BSC by
sending BS POWER CONTROL on the A-bis/RSL with the Channel Number
IE set to 0x80 (RSL_CHAN_BCCH).  This makes osmo-bts reduce the
transmission power on inactive timeslots of the BCCH carrier.

This is a non-standard, Osmocom specific extension, so indicate
support of this feature to the BSC in the feature vector.

For more details, see 3GPP TS 45.008, section 7.1.

Change-Id: I3dcee6e910ccc61c5c63c728db9ea04327e2fc98
Depends: I69283b3f35988fc7a1a1dcf1a1ad3b67f08ec716
Related: SYS#4919
---
M include/osmo-bts/gsm_data.h
M src/common/rsl.c
M src/common/scheduler.c
M src/common/vty.c
M src/osmo-bts-trx/main.c
M src/osmo-bts-trx/scheduler_trx.c
6 files changed, 69 insertions(+), 0 deletions(-)


  git pull ssh://gerrit.osmocom.org:29418/osmo-bts refs/changes/76/24776/3
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Gerrit-Project: osmo-bts
Gerrit-Branch: master
Gerrit-Change-Id: I3dcee6e910ccc61c5c63c728db9ea04327e2fc98
Gerrit-Change-Number: 24776
Gerrit-PatchSet: 3
Gerrit-Owner: fixeria <vyanitskiy at sysmocom.de>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: pespin <pespin at sysmocom.de>
Gerrit-MessageType: newpatchset
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