27 Feb
2018
27 Feb
'18
7:48 p.m.
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http://cgit.osmocom.org/osmo-bts/commit/?id=b3a2a3e24f44adcc6660d33cc9684a8…
commit b3a2a3e24f44adcc6660d33cc9684a8f24271e2e
Author: Harald Welte <laforge(a)gnumonks.org>
Date: Mon Jun 27 18:56:01 2016 +0200
RACH decoding: Use BER threshold for RACH ghost detection
When decoding RACH bursts, we should use a BER threshold in order to
help distinguish 'ghost' RACH bursts from real RACH bursts.
The theoretical ideal threshold according to some papers is 7 out of 41
bits qhich aquals to Eb/N0 of 0 dB = 0.1707 (17.07%)
We add a new 'ber10k' parameter to the RACH indication l1sap primitive
(needs separate change for libosmocore), and then fill this value from
osmo-bts-{sysmo,lc15,trx,octphy}. The common part above L1SAP then
applies the threshold, which can be changed from vty using the
"max-ber10k-rach <0-10000>"
command available at the BTS node. The unit is BER in 1/10000, i.e. a
value of 100 equals 1% bit error rate.
Change-Id: Ic41c11f6312a36baa2738547e8dcec80829457f8
http://cgit.osmocom.org/osmo-bts/commit/?id=c2b4c668f3510b7b0baace749c5a310…
commit c2b4c668f3510b7b0baace749c5a310959010e90
Author: Harald Welte <laforge(a)gnumonks.org>
Date: Mon Feb 26 11:57:49 2018 +0100
Move rach_busy counting above L1SAP
In the past, rach_busy counting was performed below L1SAP, while
reporting was handled above. This lead to subtle differences between
the BTS models, such as osmo-bts-trx missing to increment rach_busy.
Let's move the rach_busy counting above L1SAP to share more code.
This means we need libosmocore Change-Id
I9439810c3a3ad89ea0302753617b850749af887c for the additional required
parameters in ph_rach_ind_param, as well as libosmocore Change-id
I2b1926a37bde860dcfeb0d613eb55a71271928c5 for osmo-bts-trx to determine
the RACH bit error rate.
Change-Id: I3b989580cb38082e3fd8fc50a11fedda13991092
Closes: OS#3003
-----------------------------------------------------------------------
Summary of changes:
include/osmo-bts/gsm_data.h | 1 +
src/common/bts.c | 1 +
src/common/l1sap.c | 27 +++++++++++++++++++++------
src/common/vty.c | 16 ++++++++++++++++
src/osmo-bts-litecell15/l1_if.c | 16 ++++++----------
src/osmo-bts-octphy/l1_if.c | 32 +++++++++++---------------------
src/osmo-bts-sysmo/l1_if.c | 16 ++++++----------
src/osmo-bts-trx/scheduler_trx.c | 6 +++++-
8 files changed, 67 insertions(+), 48 deletions(-)
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Osmocom BTS-side code (Abis, scheduling, ...)