Change in osmo-bsc[master]: RSL: rx and tx VAMOS Channel Number cbits for VAMOS lchans

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neels gerrit-no-reply at lists.osmocom.org
Mon May 31 00:22:57 UTC 2021


neels has posted comments on this change. ( https://gerrit.osmocom.org/c/osmo-bsc/+/24430 )

Change subject: RSL: rx and tx VAMOS Channel Number cbits for VAMOS lchans
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Patch Set 6:

> If the related use of c-bits was only in osmo-bts specific code, or if we knew Ericsson uses the same cbits assignment, then we would at least keep that door open.

We use Osmocom specific VAMOS cbits only to talk to secondary VAMOS lchans.
We only activate VAMOS shadow lchans for BTS that sent BTS_FEAT_VAMOS == 1.
So far only osmo-bts gets this flag set to 1.
So the Osmocom specific VAMOS cbits *are* only sent to osmo type BTS.

It would indeed be nice to see how other vendors implement addressing VAMOS shadows...
So far I don't know where to find such info.

I don't really see a door closing for other vendors. If some other BTS model would also get the BTS_FEAT_VAMOS set to 1 in the future, we likely need to anyway special-case VAMOS indication for shadow lchans for each BTS model; then based on the actual BTS model value. At the moment, basing this alone on BTS_FEAT_VAMOS suffices (because that so far implies it being an osmo-bts).


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Gerrit-Project: osmo-bsc
Gerrit-Branch: master
Gerrit-Change-Id: I957eff0d2c33ec795eda75a4bff21965b0179f73
Gerrit-Change-Number: 24430
Gerrit-PatchSet: 6
Gerrit-Owner: neels <nhofmeyr at sysmocom.de>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: pespin <pespin at sysmocom.de>
Gerrit-CC: laforge <laforge at osmocom.org>
Gerrit-Comment-Date: Mon, 31 May 2021 00:22:57 +0000
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