Change in ...osmo-bts[master]: Clarify and refactor link quality (C/I) handling

fixeria gerrit-no-reply at lists.osmocom.org
Fri Jul 19 15:58:24 UTC 2019


Hello pespin, ipse, laforge, Jenkins Builder, 

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

    https://gerrit.osmocom.org/c/osmo-bts/+/14686

to look at the new patch set (#6).

Change subject: Clarify and refactor link quality (C/I) handling
......................................................................

Clarify and refactor link quality (C/I) handling

The radio link quality is defined by C/I (Carrier-to-Interference
ratio), which is computed from the training sequence of each
received burst, by comparing the "ideal" training sequence with
the actual (received) one.

Link quality measurements are used by L1SAP to filter out "ghost"
Access Bursts, and by the link quality adaptation algorithms. One
can define minimum link quality values using the VTY interface.

On the VTY interface we expect integer C/I values in centiBels
(cB, 10e-2 B), while the internal structures are using float
values in deciBels (dB, 10e-1 B). Some PHYs (sysmo, octphy,
oc2g, and litecell15) expose C/I measurements in deciBels,
while on the L1SAP interface we finally send then in centiBels.

Let's avoid this confusion and stick to a single format, that
will be used by the internal logic of OsmoBTS - integer values
(int16_t) in centiBels. This will give us the range of:

  -32768  .. 32767  centiBels, or
  -3276.8 .. 3276.7 deciBels,

which is certainly sufficient.

Change-Id: If624d6fdc0270e6813af8700d95f1345903c8a01
---
M doc/manuals/vty/bts_vty_reference.xml
M include/osmo-bts/gsm_data_shared.h
M src/common/bts.c
M src/common/l1sap.c
M src/common/pcu_sock.c
M src/common/vty.c
M src/osmo-bts-litecell15/l1_if.c
M src/osmo-bts-oc2g/l1_if.c
M src/osmo-bts-sysmo/l1_if.c
9 files changed, 22 insertions(+), 22 deletions(-)


  git pull ssh://gerrit.osmocom.org:29418/osmo-bts refs/changes/86/14686/6
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To view, visit https://gerrit.osmocom.org/c/osmo-bts/+/14686
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Gerrit-Project: osmo-bts
Gerrit-Branch: master
Gerrit-Change-Id: If624d6fdc0270e6813af8700d95f1345903c8a01
Gerrit-Change-Number: 14686
Gerrit-PatchSet: 6
Gerrit-Owner: fixeria <axilirator at gmail.com>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: fixeria <axilirator at gmail.com>
Gerrit-Reviewer: ipse <Alexander.Chemeris at gmail.com>
Gerrit-Reviewer: laforge <laforge at gnumonks.org>
Gerrit-Reviewer: pespin <pespin at sysmocom.de>
Gerrit-MessageType: newpatchset
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