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Merge remote-tracking branch 'origin/fix-msg3-datarace' into integration_2025_w23 (!3443)

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Fix data race in NR UE MSG3 scheduling

Fixed a data race between DL processing of RAR and UL scheduler, which might
result in dropping MSG3.

It was possible that the UL scheduler for the UL slot which RAR indicates as
MSG3 slot was already run by the time the RAR was decoded.

Therefore when DCI for RAR is decoded, assume worst case and halt UL scheduler
for next slot until RAR is decoded solving the data race. This also in turn
halts all later scheduling due to sequential nature of the UL scheduler calls.

Closes #962
This commit is contained in:
Jaroslava Fiedlerova
2025-06-03 18:59:16 +02:00
parent 8fbee94045 85f3e62caf
commit 3bf3b78cb6
8 changed files with 36 additions and 25 deletions
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executables/nr-ue.c
+2 -1
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@@ -751,7 +751,8 @@ static int UE_dl_preprocessing(PHY_VARS_NR_UE *UE,
}
sampleShift = pbch_pdcch_processing(UE, proc, phy_data);
if (phy_data->dlsch[0].active && phy_data->dlsch[0].rnti_type == TYPE_C_RNTI_) {
if (phy_data->dlsch[0].active
&& (phy_data->dlsch[0].rnti_type == TYPE_C_RNTI_ || phy_data->dlsch[0].rnti_type == TYPE_RA_RNTI_)) {
// indicate to tx thread to wait for DLSCH decoding
if (phy_data->dlsch[0].dlsch_config.k1_feedback) { // if feedback is 0 there is no HARQ associated with this DLSCH
const int ack_nack_slot = (proc->nr_slot_rx + phy_data->dlsch[0].dlsch_config.k1_feedback) % fp->slots_per_frame;