Change in osmo-bsc[master]: hodec2: don't apply AFS bias to same-cell lchans

laforge gerrit-no-reply at lists.osmocom.org
Thu Jun 10 12:30:32 UTC 2021


laforge has posted comments on this change. ( https://gerrit.osmocom.org/c/osmo-bsc/+/24608 )

Change subject: hodec2: don't apply AFS bias to same-cell lchans
......................................................................


Patch Set 1: Code-Review+1

(1 comment)

https://gerrit.osmocom.org/c/osmo-bsc/+/24608/1//COMMIT_MSG 
Commit Message:

https://gerrit.osmocom.org/c/osmo-bsc/+/24608/1//COMMIT_MSG@12 
PS1, Line 12: - same-cell lchans obviously have identical rxlev;
> last two times i asked myself the same questions, the answer was that the BCCH is only transmitted o […]
you are all correct:
* different TRX (== ARFCN in non-hopping case) can experience [slightly] different path loss as their frequency differs slightly, and the cable losses and antenna gain are slightly frequency dependent.  But I would expect this to be less than 2dB, which is in any case the tolerance for errors in the UE measurement process.
* neighbor channel measurements are always performed on the BCCH carrier (FCCH + SCH detection, optionally also BCCH decoding).  So you will never get a measurement for anything != the BCCH carrying TRX, which is TRX0 in our case
* different ARFCN definitely experience different interference and hence differen RxQual.  Hoewver, there is no RxQual reporting of neighbors.  And even if there was, it would be on TRX0==BCCH and not on other channels.



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Gerrit-Project: osmo-bsc
Gerrit-Branch: master
Gerrit-Change-Id: I315f24123ae016887ab91666870ce252e096f90f
Gerrit-Change-Number: 24608
Gerrit-PatchSet: 1
Gerrit-Owner: neels <nhofmeyr at sysmocom.de>
Gerrit-Reviewer: Hoernchen <ewild at sysmocom.de>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: fixeria <vyanitskiy at sysmocom.de>
Gerrit-Reviewer: laforge <laforge at osmocom.org>
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