Change in osmo-pcu[master]: sba: Document AGCH_START_OFFSET after some experimental tests

pespin gerrit-no-reply at lists.osmocom.org
Mon Mar 29 08:58:21 UTC 2021


pespin has posted comments on this change. ( https://gerrit.osmocom.org/c/osmo-pcu/+/23511 )

Change subject: sba: Document AGCH_START_OFFSET after some experimental tests
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Patch Set 2:

> Patch Set 2:
> 
> (2 comments)
> 
> As discussed on the call yesterday, the proper way is to report the AGCH queue length to the PCU so the PCU can use this as a factor to compute the starting FN.
> 
> Furthermore, even without the above, this is all (obviously) affected by the fn-advance and rts-advance.  So even without any load-based feedback, the fn/rts advance should be taken into account.

I think neither of fn/rts advance really affect timing here.
* fn-advance is being applied in sync both scheduling CCCH and requesting the Imm ASS to the PCU.
* rts-advance is neither affected since the BTS doesn't care about the FN at which the Imm ass is sent to it from the PCU using PCU_IF_SAPI_PCH, it simply queues it with bts_agch_enqueue and schedules it ASAP. So From the point of view of the PCU, the different value in rts-advance in use doesn't matter.


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Gerrit-Project: osmo-pcu
Gerrit-Branch: master
Gerrit-Change-Id: Id1460207be25750aeb5c1d7af2fac6591cf5e424
Gerrit-Change-Number: 23511
Gerrit-PatchSet: 2
Gerrit-Owner: pespin <pespin at sysmocom.de>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: fixeria <vyanitskiy at sysmocom.de>
Gerrit-Reviewer: laforge <laforge at osmocom.org>
Gerrit-Comment-Date: Mon, 29 Mar 2021 08:58:21 +0000
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