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Re-establish RLC for SRB1 only when receiving RRCReestablishmentRequest

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- according to 5.3.7.4 of TS 38.331: 1> re-establish RLC for SRB1;
- gNB:
1) re-establish RLC for SRB1 in nr_rlc_update_id
2) re-establish RLC for remaining RBs concurrently with RRCReconfiguration

issue: gNB) in nr_rlc_update_id the gNB is re-establishing RLC for all
            RBs at the same time when receiving RRCReestablishmentRequest
            from UE
        UE) according to the specs, the UE is re-establishing RLC for
            SRB1 with RRCReestablishmentRequest the other RBs are
            re-established during RRCReconfiguration (in our case in
            nr_rrc_ue_process_RadioBearerConfig) when receiving
            reestablishRLC IE in rlc_BearerToAddModList
    RLC TX) this leads to RLC counters mismatch after re-establishment:
            control PDUs discarded until max nb of retx is reached
            and then UL failure occurs
This commit is contained in:
Guido Casati
2024-04-30 08:40:56 +02:00
committed by Robert Schmidt
parent 99c4e5477c
commit f010058e45
4 changed files with 21 additions and 7 deletions
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openair2/RRC/NR/rrc_gNB.c
+4
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@@ -1080,6 +1080,10 @@ static void rrc_gNB_process_RRCReestablishmentComplete(const protocol_ctxt_t *co
for (i = 1; i < ue_p->masterCellGroup->rlc_BearerToAddModList->list.count; ++i)
asn1cSeqAdd(&cellGroupConfig->rlc_BearerToAddModList->list, ue_p->masterCellGroup->rlc_BearerToAddModList->list.array[i]);
/*
* At this stage, PDCP entity are re-established and reestablishRLC is flagged
* with RRCReconfiguration to complete RLC re-establishment of remaining bearers
*/
for (i = 0; i < cellGroupConfig->rlc_BearerToAddModList->list.count; i++) {
asn1cCallocOne(cellGroupConfig->rlc_BearerToAddModList->list.array[i]->reestablishRLC,
NR_RLC_BearerConfig__reestablishRLC_true);