Attention is currently required from: jolly, pespin, dexter.

fixeria has posted comments on this change. ( 
https://gerrit.osmocom.org/c/osmo-pcu/+/32694 )

Change subject: gprs_rlcmac: also use direct TLLI PCUIF for paging MAC blocks
......................................................................


Patch Set 2: Code-Review-1

(2 comments)

Commit Message:

https://gerrit.osmocom.org/c/osmo-pcu/+/32694/comment/16f1b6fa_4b9e1736
PS2, Line 15: It was not clear that PAGING
            : COMMAND and IMMEDIATE ASSIGNMENT (via PCH) require a confirmation 
by the
            : receiving end
Reading this patch again I am not sure if I understand the goal you're aiming 
to achieve. Yes, RR Immediate Assignment messages sent via PCH do need to be 
confirmed, but what makes you think that paging requests need to be confirmed 
too? You're even saying there is a bug, but what exactly is broken?

Take a look at `pcu_rx_data_cnf()`. This function checks if the SAPI is 
`PCU_IF_SAPI_PCH` and calls `bts_rcv_imm_ass_cnf` iff `data_cnf->data[2] == 
GSM48_MT_RR_IMM_ASS`. AFAICS, no confirmation is expected for paging requests.


File src/gprs_rlcmac.c:

https://gerrit.osmocom.org/c/osmo-pcu/+/32694/comment/14fc3dcd_44f3849f
PS2, Line 33: The caller must use a TMSI/TLLI
Is there anything in the specs. limiting the MI type to TMSI for PS paging? I 
am not aware of such limitations. TMSI may be unassigned and the MS can be 
paged by IMSI. This looks wrong to me.



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Gerrit-Project: osmo-pcu
Gerrit-Branch: master
Gerrit-Change-Id: I99cfe373fa157cfb32b74c113ad9935347653a71
Gerrit-Change-Number: 32694
Gerrit-PatchSet: 2
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Gerrit-Comment-Date: Mon, 15 May 2023 13:48:56 +0000
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