Change in osmo-pcu[master]: Track scheduled UL blocks through USF

pespin gerrit-no-reply at lists.osmocom.org
Wed Mar 24 18:17:40 UTC 2021


pespin has posted comments on this change. ( https://gerrit.osmocom.org/c/osmo-pcu/+/23492 )

Change subject: Track scheduled UL blocks through USF
......................................................................


Patch Set 1:

(1 comment)

https://gerrit.osmocom.org/c/osmo-pcu/+/23492/1/src/gprs_rlcmac_sched.cpp 
File src/gprs_rlcmac_sched.cpp:

https://gerrit.osmocom.org/c/osmo-pcu/+/23492/1/src/gprs_rlcmac_sched.cpp@463 
PS1, Line 463: 	poll_fn = rts_next_fn(fn, block_nr);
I'm not totally understanding why this rts_next_fn is needed here TBH. According to this:
1- RTS.req FN=13 sends DL message with USF=0
2- DATA.ind FN=17 we receive an UL block from MS managing USF=0

So that means that whenever we request USF on FN = x, the PCU expects the response on FN = x + 1.
However, I always though that requesting USF on FN = x meant the MS would send the UL block on FN = x too (because there's a UL/DL delay opf a few TS iirc).

Someone willing to shed some light on this would be great.

Related: See also https://gerrit.osmocom.org/c/osmo-ttcn3-hacks/+/23494



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Gerrit-Project: osmo-pcu
Gerrit-Branch: master
Gerrit-Change-Id: Ia99c9edad6e5bd837e9baeb4fb2683b227887957
Gerrit-Change-Number: 23492
Gerrit-PatchSet: 1
Gerrit-Owner: pespin <pespin at sysmocom.de>
Gerrit-Reviewer: Hoernchen <ewild at sysmocom.de>
Gerrit-Reviewer: daniel <dwillmann at sysmocom.de>
Gerrit-Reviewer: fixeria <vyanitskiy at sysmocom.de>
Gerrit-Reviewer: laforge <laforge at osmocom.org>
Gerrit-Reviewer: lynxis lazus <lynxis at fe80.eu>
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