Change in osmocom-bb[master]: layer23/cbch-sniff: fix: do not blindly assume presence of CBCH

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Vadim Yanitskiy gerrit-no-reply at lists.osmocom.org
Wed Oct 7 21:10:38 UTC 2020


Vadim Yanitskiy has posted comments on this change. ( https://gerrit.osmocom.org/c/osmocom-bb/+/20475 )

Change subject: layer23/cbch-sniff: fix: do not blindly assume presence of CBCH
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Patch Set 1:

(1 comment)

https://gerrit.osmocom.org/c/osmocom-bb/+/20475/1//COMMIT_MSG 
Commit Message:

https://gerrit.osmocom.org/c/osmocom-bb/+/20475/1//COMMIT_MSG@9 
PS1, Line 9: We cannot blindly assume that CBCH is present on TS0/SDCCH4 before
> SO you are blindly assuming it's not present now? Is that a fix?
The key point is that there are two ways to deal with CBCH: a) enable CBCH decoding task together with BCCH/SDCCH4 decoding tasks in the L1, so we stay on BCCH and get CBCH blocks together with CCCH/AGCH/PCH frames; b) treat CBCH like a dedicated channel and tune the L1 to it, so we receive CBCH frames only. The former only works if CBCH is allocated on C0/TS0.

This application follows approach b), so even if there is CBCH on C0/TS0, it does not make sense to activate it in advance - we go to a dedicated channel anyway. Also, from my experience, CBCH on C0/TS0 is quite rare. Usually, it can be found on SDCCH8 (often hopping).



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Gerrit-Project: osmocom-bb
Gerrit-Branch: master
Gerrit-Change-Id: Ie8ce572df292d0b03c0f743bcf26184619176321
Gerrit-Change-Number: 20475
Gerrit-PatchSet: 1
Gerrit-Owner: Vadim Yanitskiy <vyanitskiy at sysmocom.de>
Gerrit-Reviewer: Jenkins Builder
Gerrit-CC: pespin <pespin at sysmocom.de>
Gerrit-Comment-Date: Wed, 07 Oct 2020 21:10:38 +0000
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Comment-In-Reply-To: pespin <pespin at sysmocom.de>
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