25 May
2017
25 May
'17
12:19 a.m.
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http://cgit.osmocom.org/osmo-bts/commit/?id=e0fb3ae52d747b26b6487ec67c79ece…
commit e0fb3ae52d747b26b6487ec67c79eceaf37a125c
Author: Philipp Maier <pmaier(a)sysmocom.de>
Date: Wed Apr 19 17:31:28 2017 +0200
measurement: exclude idle channels from uplink measurement
The DATA-IND, received from the physical layer does not only include the actual
uplink data. It also includes the frames which are received when the channel
is idle (which is just noise). This would falsify the measurement results.
Depending on the BTS model, the phy may also filter the idle frames and not
send a DATA-IND at all, when the channel is idle. If this is the case, the
measurement period end can not be detected properly.
The idle frames are located at the very end of each measurement period. In
order to fix the issue, the measurement perioud has to end early. For TCH/F and
TCH/H 1, one frame has to be skipped. For TCH/H 0 two frames are skipped.
Example: For a TCH/F in TS0, the Measurement perioud would end at frame number
103. However, 103 is reserverd as idle frame. So we need to detect the end of
the measurement period at frame number 103 (-1).
Change-Id: I471a767c7974bdacadc3233d0c3e7b7965f6eafa
-----------------------------------------------------------------------
Summary of changes:
src/common/measurement.c | 53 ++++++++++++++++++++++++++----------------------
1 file changed, 29 insertions(+), 24 deletions(-)
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Osmocom BTS-side code (Abis, scheduling, ...)