Change in osmo-bts[master]: osmo-bts-trx/scheduler: properly handle NOPE.ind during handover

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fixeria gerrit-no-reply at lists.osmocom.org
Wed Jun 10 13:50:30 UTC 2020


Hello laforge, Jenkins Builder, 

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

    https://gerrit.osmocom.org/c/osmo-bts/+/18734

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

Change subject: osmo-bts-trx/scheduler: properly handle NOPE.ind during handover
......................................................................

osmo-bts-trx/scheduler: properly handle NOPE.ind during handover

Looking at GSMTAP during handover, I've noticed many packets on
RACH looking pretty much like false positives, all with RA=0x00.
I correlated GSMTAP traces with TRXD traces, and figured out
that they all are triggered by NOPE indications from osmo-trx.

Since a NOPE.ind carries no valid burst, all its bits are set to
zero. Funny enough, this sequence is still decoded just fine as
a valid RACH, so that's why we see it on GSMTAP. Later on it
gets rejected by L1SAP due to bad RSSI, ToA, and/or C/I ratio.

The is a side effect of [1]. In order to ensure proper Uplink
measurement reporting during handover, including the time
before the handover RACH is received, let's treat and handle
NOPE indications as Normal Bursts.

[1] Ice45d5986610d9bcef2a7e41f0a395ec779e3928

Change-Id: Ic69f3bc2b776a23374c28a6884080a54bc16ef5f
Related: OS#4592
---
M src/osmo-bts-trx/scheduler_trx.c
1 file changed, 9 insertions(+), 6 deletions(-)


  git pull ssh://gerrit.osmocom.org:29418/osmo-bts refs/changes/34/18734/3
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Gerrit-Project: osmo-bts
Gerrit-Branch: master
Gerrit-Change-Id: Ic69f3bc2b776a23374c28a6884080a54bc16ef5f
Gerrit-Change-Number: 18734
Gerrit-PatchSet: 3
Gerrit-Owner: fixeria <vyanitskiy at sysmocom.de>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: fixeria <vyanitskiy at sysmocom.de>
Gerrit-Reviewer: laforge <laforge at osmocom.org>
Gerrit-MessageType: newpatchset
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