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srsLTE
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sched,nr: force R<0.9 by reducing mcs

This commit is contained in:
Francisco 2021-10-07 10:30:09 +01:00 committed by Francisco Paisana
parent d6a3daff8a
commit 7d4a5238f6
3 changed files with 48 additions and 30 deletions
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2
srsenb/hdr/stack/mac/nr/sched_nr_harq.h
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@ -58,7 +58,7 @@ public:
bool new_retx(slot_point slot_tx, slot_point slot_ack);
// NOTE: Has to be used before first tx is dispatched
bool set_tbs(uint32_t tbs);
bool set_tbs(uint32_t tbs, int mcs = -1);
const uint32_t pid;

71
srsenb/src/stack/mac/nr/sched_nr_grant_allocator.cc
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@ -243,36 +243,51 @@ alloc_result bwp_slot_allocator::alloc_pdsch(slot_ue& ue, const prb_grant& dl_gr
// Allocation Successful
// Generate PDCCH
pdcch_dl_t& pdcch = bwp_pdcch_slot.dl_pdcchs.back();
fill_dl_dci_ue_fields(ue, *bwp_grid.cfg, ss_id, pdcch.dci.ctx.location, pdcch.dci);
pdcch.dci.pucch_resource = 0;
pdcch.dci.dai = std::count_if(bwp_uci_slot.pending_acks.begin(),
bwp_uci_slot.pending_acks.end(),
[&ue](const harq_ack_t& p) { return p.res.rnti == ue.rnti; });
pdcch.dci.dai %= 4;
pdcch.dci_cfg = ue.cfg->phy().get_dci_cfg();
int mcs = ue.cfg->ue_cfg()->fixed_dl_mcs;
do {
// Generate PDCCH
pdcch_dl_t& pdcch = bwp_pdcch_slot.dl_pdcchs.back();
fill_dl_dci_ue_fields(ue, *bwp_grid.cfg, ss_id, pdcch.dci.ctx.location, pdcch.dci);
pdcch.dci.pucch_resource = 0;
pdcch.dci.dai = std::count_if(bwp_uci_slot.pending_acks.begin(),
bwp_uci_slot.pending_acks.end(),
[&ue](const harq_ack_t& p) { return p.res.rnti == ue.rnti; });
pdcch.dci.dai %= 4;
pdcch.dci_cfg = ue.cfg->phy().get_dci_cfg();
// Generate PUCCH
bwp_uci_slot.pending_acks.emplace_back();
bwp_uci_slot.pending_acks.back().phy_cfg = &ue.cfg->phy();
srsran_assert(ue.cfg->phy().get_pdsch_ack_resource(pdcch.dci, bwp_uci_slot.pending_acks.back().res),
"Error getting ack resource");
// Generate PUCCH
bwp_uci_slot.pending_acks.emplace_back();
bwp_uci_slot.pending_acks.back().phy_cfg = &ue.cfg->phy();
srsran_assert(ue.cfg->phy().get_pdsch_ack_resource(pdcch.dci, bwp_uci_slot.pending_acks.back().res),
"Error getting ack resource");
// Generate PDSCH
bwp_pdsch_slot.dl_prbs |= dl_grant;
bwp_pdsch_slot.pdschs.emplace_back();
pdsch_t& pdsch = bwp_pdsch_slot.pdschs.back();
srsran_slot_cfg_t slot_cfg;
slot_cfg.idx = ue.pdsch_slot.to_uint();
bool ret = ue.cfg->phy().get_pdsch_cfg(slot_cfg, pdcch.dci, pdsch.sch);
srsran_assert(ret, "Error converting DCI to grant");
pdsch.sch.grant.tb[0].softbuffer.tx = ue.h_dl->get_softbuffer().get();
pdsch.data[0] = ue.h_dl->get_tx_pdu()->get();
if (ue.h_dl->nof_retx() == 0) {
ue.h_dl->set_tbs(pdsch.sch.grant.tb[0].tbs); // update HARQ with correct TBS
} else {
srsran_assert(pdsch.sch.grant.tb[0].tbs == (int)ue.h_dl->tbs(), "The TBS did not remain constant in retx");
// Generate PDSCH
bwp_pdsch_slot.dl_prbs |= dl_grant;
bwp_pdsch_slot.pdschs.emplace_back();
pdsch_t& pdsch = bwp_pdsch_slot.pdschs.back();
srsran_slot_cfg_t slot_cfg;
slot_cfg.idx = ue.pdsch_slot.to_uint();
bool ret = ue.cfg->phy().get_pdsch_cfg(slot_cfg, pdcch.dci, pdsch.sch);
srsran_assert(ret, "Error converting DCI to grant");
pdsch.sch.grant.tb[0].softbuffer.tx = ue.h_dl->get_softbuffer().get();
pdsch.data[0] = ue.h_dl->get_tx_pdu()->get();
if (ue.h_dl->nof_retx() == 0) {
ue.h_dl->set_tbs(pdsch.sch.grant.tb[0].tbs); // update HARQ with correct TBS
} else {
srsran_assert(pdsch.sch.grant.tb[0].tbs == (int)ue.h_dl->tbs(), "The TBS did not remain constant in retx");
}
if (bwp_pdsch_slot.pdschs.back().sch.grant.tb[0].R < 0.9 or mcs == 0) {
break;
}
// Decrease MCS if rate is too high
mcs--;
ue.h_dl->set_tbs(100, mcs);
bwp_pdsch_slot.pdschs.pop_back();
bwp_uci_slot.pending_acks.pop_back();
} while (true);
if (mcs == 0) {
logger.warning("Couldn't find mcs that leads to R<0.9");
}
return alloc_result::success;

5
srsenb/src/stack/mac/nr/sched_nr_harq.cc
View File

@ -66,12 +66,15 @@ bool harq_proc::new_tx(slot_point slot_tx_,
return true;
}
bool harq_proc::set_tbs(uint32_t tbs)
bool harq_proc::set_tbs(uint32_t tbs, int mcs)
{
if (empty() or nof_retx() > 0) {
return false;
}
tb[0].tbs = tbs;
if (mcs >= 0) {
tb[0].mcs = mcs;
}
return true;
}