Change in osmocom-bb[master]: trxcon/scheduler: refactor Downlink measurement processing

[fixeria]

Hello laforge, Jenkins Builder, 

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

    https://gerrit.osmocom.org/c/osmocom-bb/+/17350

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

Change subject: trxcon/scheduler: refactor Downlink measurement processing
......................................................................

trxcon/scheduler: refactor Downlink measurement processing

So far we used to store the sums of ToA and RSSI measurements in the
logical channel state, and after decoding of a block, we did calculate
the average. This approach works fine for xCCH and PDTCH, but when it
comes to block-diagonal interleaving (which is used on TCH/F and TCH/H
channels), the results are incorrect. The problem is that a burst on
TCH may carry 57 bits of one encoded frame and 57 bits of another.

Instead of calculating the sum of measurements on the fly, let's push
them into a circular buffer (the measurement history), and keep them
there even after decoding of a block. This would allow us to calculate
the average of N last measurements depending on the interleaving type.

A single circular buffer can hold up to 8 unique measurements, so the
recent measurements would basically override the oldest ones.

Change-Id: I211ee3314f0a284112a4deddc0e93028f4a27cef
---
M src/host/trxcon/sched_lchan_common.c
M src/host/trxcon/sched_lchan_desc.c
M src/host/trxcon/sched_lchan_pdtch.c
M src/host/trxcon/sched_lchan_sch.c
M src/host/trxcon/sched_lchan_tchf.c
M src/host/trxcon/sched_lchan_tchh.c
M src/host/trxcon/sched_lchan_xcch.c
M src/host/trxcon/sched_trx.c
M src/host/trxcon/sched_trx.h
M src/host/trxcon/trx_if.c
10 files changed, 140 insertions(+), 74 deletions(-)


  git pull ssh://gerrit.osmocom.org:29418/osmocom-bb refs/changes/50/17350/3
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Gerrit-Project: osmocom-bb
Gerrit-Branch: master
Gerrit-Change-Id: I211ee3314f0a284112a4deddc0e93028f4a27cef
Gerrit-Change-Number: 17350
Gerrit-PatchSet: 3
Gerrit-Owner: fixeria <axilirator at gmail.com>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: laforge <laforge at osmocom.org>
Gerrit-MessageType: newpatchset
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