Change in osmo-bts[master]: chan activ: activate DL SACCH only when TA is known

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neels gerrit-no-reply at lists.osmocom.org
Thu Jan 28 22:57:26 UTC 2021


Hello Jenkins Builder, 

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

    https://gerrit.osmocom.org/c/osmo-bts/+/22509

to look at the new patch set (#2).

Change subject: chan activ: activate DL SACCH only when TA is known
......................................................................

chan activ: activate DL SACCH only when TA is known

A channel activation for handover to another cell does not know the
Timing Advance until the handover RACH is received. It does not make
much sense to enable downlink SACCH without an accurate TA.

If the BSC omits the Access Delay IE (a.k.a. the Timing Advance), do not
enable downlink SACCH. This is expected to happen only for inter-cell
handover. In all other situations, the TA should be known either from a
Channel Request RACH for Immediate Assignment, or from the previous
lchan on the same cell upon Assignment / intra-cell handover.

Related: OS#4008 OS#4009 SYS#5192
Change-Id: I170b63c9856230d5f1a10654a9d950ada8e730d7
---
M src/common/rsl.c
1 file changed, 14 insertions(+), 2 deletions(-)


  git pull ssh://gerrit.osmocom.org:29418/osmo-bts refs/changes/09/22509/2
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Gerrit-Project: osmo-bts
Gerrit-Branch: master
Gerrit-Change-Id: I170b63c9856230d5f1a10654a9d950ada8e730d7
Gerrit-Change-Number: 22509
Gerrit-PatchSet: 2
Gerrit-Owner: neels <nhofmeyr at sysmocom.de>
Gerrit-Reviewer: Jenkins Builder
Gerrit-CC: pespin <pespin at sysmocom.de>
Gerrit-MessageType: newpatchset
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