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@ -43,9 +43,19 @@ namespace sched_utils {
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const uint32_t conres_ce_size = 6;
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//! Obtains TB size *in bytes* for a given MCS and N_{PRB}
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uint32_t get_tbs_bytes(uint32_t mcs, uint32_t nof_alloc_prb, bool is_ul)
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uint32_t get_tbs_bytes(uint32_t mcs, uint32_t nof_alloc_prb, bool use_tbs_index_alt, bool is_ul)
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{
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return srslte_ra_tbs_from_idx(srslte_ra_tbs_idx_from_mcs(mcs, is_ul), nof_alloc_prb) / 8;
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int tbs_idx = srslte_ra_tbs_idx_from_mcs(mcs, use_tbs_index_alt, is_ul);
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if (tbs_idx < SRSLTE_SUCCESS) {
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tbs_idx = 0;
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}
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int tbs = srslte_ra_tbs_from_idx((uint32_t)tbs_idx, nof_alloc_prb);
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if (tbs < SRSLTE_SUCCESS) {
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tbs = 0;
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}
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return (uint32_t)tbs / 8U;
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}
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//! TS 36.321 sec 7.1.2 - MAC PDU subheader is 2 bytes if L<=128 and 3 otherwise
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@ -535,14 +545,15 @@ std::pair<int, int> sched_ue::compute_mcs_and_tbs(uint32_t ue_cc_i
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tbs_bytes = carriers[ue_cc_idx].alloc_tbs_dl(nof_alloc_prbs, nof_re, req_bytes.second, &mcs);
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} else {
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// Fixed MCS
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tbs_bytes = sched_utils::get_tbs_bytes((uint32_t)carriers[ue_cc_idx].fixed_mcs_dl, nof_alloc_prbs, false);
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tbs_bytes = sched_utils::get_tbs_bytes(
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(uint32_t)carriers[ue_cc_idx].fixed_mcs_dl, nof_alloc_prbs, cfg.use_tbs_index_alt, false);
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}
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// If the number of prbs is not sufficient to fit minimum required bytes, increase the mcs
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// NOTE: this may happen during ConRes CE tx when DL-CQI is still not available
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while (tbs_bytes > 0 and (uint32_t) tbs_bytes < req_bytes.first and mcs < 28) {
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mcs++;
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tbs_bytes = sched_utils::get_tbs_bytes((uint32_t)mcs, nof_alloc_prbs, false);
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tbs_bytes = sched_utils::get_tbs_bytes((uint32_t)mcs, nof_alloc_prbs, cfg.use_tbs_index_alt, false);
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}
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return {mcs, tbs_bytes};
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@ -690,7 +701,7 @@ int sched_ue::generate_format0(sched_interface::ul_sched_data_t* data,
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nof_retx = (data->needs_pdcch) ? get_max_retx() : max_msg3retx;
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if (mcs >= 0) {
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tbs = srslte_ra_tbs_from_idx(srslte_ra_tbs_idx_from_mcs(mcs, true), alloc.L) / 8;
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tbs = srslte_ra_tbs_from_idx(srslte_ra_tbs_idx_from_mcs(mcs, false, true), alloc.L) / 8;
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} else {
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// dynamic mcs
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uint32_t req_bytes = get_pending_ul_new_data_unlocked(tti);
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@ -705,7 +716,7 @@ int sched_ue::generate_format0(sched_interface::ul_sched_data_t* data,
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} else {
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// retx
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h->new_retx(0, tti, &mcs, nullptr, alloc);
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tbs = srslte_ra_tbs_from_idx(srslte_ra_tbs_idx_from_mcs(mcs, true), alloc.L) / 8;
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tbs = srslte_ra_tbs_from_idx(srslte_ra_tbs_idx_from_mcs(mcs, false, true), alloc.L) / 8;
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}
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data->tbs = tbs;
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@ -1157,6 +1168,7 @@ int sched_ue::cqi_to_tbs(uint32_t cqi,
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uint32_t nof_re,
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uint32_t max_mcs,
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uint32_t max_Qm,
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bool use_tbs_index_alt,
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bool is_ul,
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uint32_t* mcs)
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{
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@ -1169,10 +1181,11 @@ int sched_ue::cqi_to_tbs(uint32_t cqi,
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do {
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sel_mcs--;
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uint32_t tbs_idx = srslte_ra_tbs_idx_from_mcs(sel_mcs, is_ul);
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uint32_t tbs_idx = srslte_ra_tbs_idx_from_mcs(sel_mcs, use_tbs_index_alt, is_ul);
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tbs = srslte_ra_tbs_from_idx(tbs_idx, nof_prb);
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coderate = srslte_coderate(tbs, nof_re);
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srslte_mod_t mod = (is_ul) ? srslte_ra_ul_mod_from_mcs(sel_mcs) : srslte_ra_dl_mod_from_mcs(sel_mcs);
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srslte_mod_t mod =
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(is_ul) ? srslte_ra_ul_mod_from_mcs(sel_mcs) : srslte_ra_dl_mod_from_mcs(sel_mcs, use_tbs_index_alt);
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Qm = SRSLTE_MIN(max_Qm, srslte_mod_bits_x_symbol(mod));
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eff_coderate = coderate / Qm;
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} while ((sel_mcs > 0 && coderate > max_coderate) || eff_coderate > 0.930);
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@ -1206,6 +1219,8 @@ sched_ue_carrier::sched_ue_carrier(const sched_interface::ue_cfg_t& cfg_,
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// set max mcs
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max_mcs_ul = cell_params->sched_cfg->pusch_max_mcs >= 0 ? cell_params->sched_cfg->pusch_max_mcs : 28;
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max_mcs_dl = cell_params->sched_cfg->pdsch_max_mcs >= 0 ? cell_params->sched_cfg->pdsch_max_mcs : 28;
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max_mcs_dl_alt =
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cell_params->sched_cfg->pdsch_max_mcs >= 0 ? SRSLTE_MIN(cell_params->sched_cfg->pdsch_max_mcs, 27) : 27;
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max_aggr_level = cell_params->sched_cfg->max_aggr_level >= 0 ? cell_params->sched_cfg->max_aggr_level : 3;
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// set fixed mcs
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@ -1280,16 +1295,17 @@ int sched_ue_carrier::alloc_tbs(uint32_t nof_prb, uint32_t nof_re, uint32_t req_
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uint32_t sel_mcs = 0;
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uint32_t cqi = is_ul ? ul_cqi : dl_cqi;
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uint32_t max_mcs = is_ul ? max_mcs_ul : max_mcs_dl;
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uint32_t max_mcs = is_ul ? max_mcs_ul : (cfg->use_tbs_index_alt) ? max_mcs_dl_alt : max_mcs_dl;
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uint32_t max_Qm = is_ul ? 4 : 6; // Allow 16-QAM in PUSCH Only
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// TODO: Compute real spectral efficiency based on PUSCH-UCI configuration
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int tbs_bytes = sched_ue::cqi_to_tbs(cqi, nof_prb, nof_re, max_mcs, max_Qm, is_ul, &sel_mcs) / 8;
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int tbs_bytes =
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sched_ue::cqi_to_tbs(cqi, nof_prb, nof_re, max_mcs, max_Qm, cfg->use_tbs_index_alt, is_ul, &sel_mcs) / 8;
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/* If less bytes are requested, lower the MCS */
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if (tbs_bytes > (int)req_bytes && req_bytes > 0) {
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int req_tbs_idx = srslte_ra_tbs_to_table_idx(req_bytes * 8, nof_prb);
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int req_mcs = srslte_ra_mcs_from_tbs_idx(req_tbs_idx, is_ul);
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int req_mcs = srslte_ra_mcs_from_tbs_idx(req_tbs_idx, cfg->use_tbs_index_alt, is_ul);
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if (req_mcs < (int)sel_mcs) {
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sel_mcs = req_mcs;
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@ -1299,7 +1315,7 @@ int sched_ue_carrier::alloc_tbs(uint32_t nof_prb, uint32_t nof_re, uint32_t req_
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// Avoid the unusual case n_prb=1, mcs=6 tbs=328 (used in voip)
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if (nof_prb == 1 && sel_mcs == 6) {
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sel_mcs--;
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uint32_t tbs_idx = srslte_ra_tbs_idx_from_mcs(sel_mcs, is_ul);
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uint32_t tbs_idx = srslte_ra_tbs_idx_from_mcs(sel_mcs, cfg->use_tbs_index_alt, is_ul);
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tbs_bytes = srslte_ra_tbs_from_idx(tbs_idx, nof_prb) / 8;
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}
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@ -1333,7 +1349,7 @@ int sched_ue_carrier::get_required_prb_dl(uint32_t req_bytes, uint32_t nof_ctrl_
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if (fixed_mcs_dl < 0 or not dl_cqi_rx) {
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tbs = alloc_tbs_dl(n + 1, nof_re, 0, &mcs);
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} else {
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tbs = srslte_ra_tbs_from_idx(srslte_ra_tbs_idx_from_mcs(fixed_mcs_dl, false), n + 1) / 8;
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tbs = srslte_ra_tbs_from_idx(srslte_ra_tbs_idx_from_mcs(fixed_mcs_dl, cfg->use_tbs_index_alt, false), n + 1) / 8;
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}
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if (tbs > 0) {
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nbytes = tbs;
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@ -1362,7 +1378,7 @@ uint32_t sched_ue_carrier::get_required_prb_ul(uint32_t req_bytes)
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if (fixed_mcs_ul < 0) {
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tbs = alloc_tbs_ul(n, nof_re, 0, &mcs);
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} else {
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tbs = srslte_ra_tbs_from_idx(srslte_ra_tbs_idx_from_mcs(fixed_mcs_ul, true), n) / 8;
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tbs = srslte_ra_tbs_from_idx(srslte_ra_tbs_idx_from_mcs(fixed_mcs_ul, false, true), n) / 8;
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}
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if (tbs > 0) {
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nbytes = tbs;
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