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Store selected MCS in UE iterator

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PF uses MCS and average throughput to decide which UE to schedule. Thus,
the first loop decides on MCS, whereas the second does the "main UE
allocation" after sorting by the PF metric.

A follow-up commit will remove sched_pusch from NR_UE_sched_ctrl_t.
Thus, we cannot rely on sched_ctrl to store the MCS in the first loop,
and look it up from there in the second. Instead, store it as part of
the UE iterator data, and take it from there.

See also: f3068caa37 ("Store selected MCS in UE iterator", for UL)
This commit is contained in:
Robert Schmidt
2025-10-30 19:14:06 +01:00
parent 1a752a8433
commit 1622724384
1 changed files with 14 additions and 9 deletions
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openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_dlsch.c
+14 -9
View File
@@ -590,6 +590,7 @@ static bool allocate_dl_retransmission(module_id_t module_id,
typedef struct UEsched_s {
float coef;
NR_UE_info_t * UE;
int selected_mcs;
} UEsched_t;
static int comparator(const void *p, const void *q)
@@ -686,17 +687,16 @@ static void pf_dl(module_id_t module_id,
const NR_bler_options_t *bo = &mac->dl_bler;
const int max_mcs_table = current_BWP->mcsTableIdx == 1 ? 27 : 28;
const int max_mcs = min(sched_ctrl->dl_max_mcs, max_mcs_table);
int selected_mcs;
if (bo->harq_round_max == 1) {
int new_mcs = min(bo->max_mcs, max_mcs);
sched_pdsch->mcs = max(bo->min_mcs, new_mcs);
sched_ctrl->dl_bler_stats.mcs = sched_pdsch->mcs;
selected_mcs = max(bo->min_mcs, new_mcs);
sched_ctrl->dl_bler_stats.mcs = selected_mcs;
} else
sched_pdsch->mcs = get_mcs_from_bler(bo, stats, &sched_ctrl->dl_bler_stats, max_mcs, frame);
sched_pdsch->nrOfLayers = get_dl_nrOfLayers(sched_ctrl, current_BWP->dci_format);
sched_pdsch->pm_index =
get_pm_index(mac, UE, current_BWP->dci_format, sched_pdsch->nrOfLayers, mac->radio_config.pdsch_AntennaPorts.XP);
const uint8_t Qm = nr_get_Qm_dl(sched_pdsch->mcs, current_BWP->mcsTableIdx);
const uint16_t R = nr_get_code_rate_dl(sched_pdsch->mcs, current_BWP->mcsTableIdx);
selected_mcs = get_mcs_from_bler(bo, stats, &sched_ctrl->dl_bler_stats, max_mcs, frame);
int l = get_dl_nrOfLayers(sched_ctrl, current_BWP->dci_format);
const uint8_t Qm = nr_get_Qm_dl(selected_mcs, current_BWP->mcsTableIdx);
const uint16_t R = nr_get_code_rate_dl(selected_mcs, current_BWP->mcsTableIdx);
uint32_t tbs = nr_compute_tbs(Qm,
R,
1, /* rbSize */
@@ -704,7 +704,7 @@ static void pf_dl(module_id_t module_id,
0, /* N_PRB_DMRS * N_DMRS_SLOT */
0 /* N_PRB_oh, 0 for initialBWP */,
0 /* tb_scaling */,
sched_pdsch->nrOfLayers) >> 3;
l) >> 3;
float coeff_ue = (float) tbs / UE->dl_thr_ue;
LOG_D(NR_MAC, "[UE %04x][%4d.%2d] b %d, thr_ue %f, tbs %d, coeff_ue %f\n",
UE->rnti,
@@ -717,6 +717,7 @@ static void pf_dl(module_id_t module_id,
/* Create UE_sched list for UEs eligible for new transmission*/
UE_sched[numUE].coef = coeff_ue;
UE_sched[numUE].UE = UE;
UE_sched[numUE].selected_mcs = selected_mcs;
numUE++;
}
}
@@ -843,6 +844,10 @@ static void pf_dl(module_id_t module_id,
sched_ctrl->cce_index = CCEIndex;
fill_pdcch_vrb_map(mac, CC_id, &sched_ctrl->sched_pdcch, CCEIndex, sched_ctrl->aggregation_level, beam.idx);
int l = get_dl_nrOfLayers(sched_ctrl, dl_bwp->dci_format);
sched_pdsch->nrOfLayers = l;
sched_pdsch->mcs = iterator->selected_mcs;
sched_pdsch->pm_index = get_pm_index(mac, iterator->UE, dl_bwp->dci_format, l, mac->radio_config.pdsch_AntennaPorts.XP);
sched_pdsch->dmrs_parms = get_dl_dmrs_params(scc, dl_bwp, tda_info, sched_pdsch->nrOfLayers);
sched_pdsch->Qm = nr_get_Qm_dl(sched_pdsch->mcs, dl_bwp->mcsTableIdx);
sched_pdsch->R = nr_get_code_rate_dl(sched_pdsch->mcs, dl_bwp->mcsTableIdx);