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Split compute_ph_factor() function to save space

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This commit is contained in:
Robert Schmidt
2026-03-25 09:03:49 +01:00
parent 70422dc3c3
commit cd0051dea1
1 changed files with 54 additions and 96 deletions
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openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_ulsch.c
+54 -96
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@@ -168,30 +168,25 @@ bwp_info_t get_pusch_bwp_start_size(NR_UE_info_t *UE)
return bwp_info;
}
static int compute_ph_factor(int mu, int tbs_bits, int rb, int n_layers, int n_symbols, int n_dmrs, long *deltaMCS, bool include_bw)
float compute_ph_rb_factor(int mu, int rb)
{
return roundf(10 * log10(rb << mu));
}
float compute_ph_mcs_factor(const NR_sched_pusch_t *pusch)
{
// 38.213 7.1.1
// if the PUSCH transmission is over more than one layer delta_tf = 0
float delta_tf = 0;
if(deltaMCS != NULL && n_layers == 1) {
const int n_re = (NR_NB_SC_PER_RB * n_symbols - n_dmrs) * rb;
const float BPRE = (float) tbs_bits/n_re; //TODO change for PUSCH with CSI
const float f = pow(2, BPRE * 1.25);
const float beta = 1.0f; //TODO change for PUSCH with CSI
delta_tf = (10 * log10((f - 1) * beta));
LOG_D(NR_MAC,
"PH factor delta_tf %f (n_re %d, n_rb %d, n_dmrs %d, n_symbols %d, tbs %d BPRE %f f %f)\n",
delta_tf,
n_re,
rb,
n_dmrs,
n_symbols,
tbs_bits,
BPRE,
f);
}
const float bw_factor = (include_bw) ? 10 * log10(rb << mu) : 0;
return ((int)roundf(delta_tf + bw_factor));
if (pusch->nrOfLayers != 1)
return 0.0f;
const NR_pusch_dmrs_t *dmrs = &pusch->dmrs_info;
const int n_dmrs = dmrs->num_dmrs_symb * dmrs->N_PRB_DMRS;
const int n_re = (NR_NB_SC_PER_RB * pusch->tda_info.nrOfSymbols - n_dmrs) * pusch->rbSize;
const float BPRE = (float)(pusch->tb_size << 3) / n_re; // TODO change for PUSCH with CSI
const float f = pow(2, BPRE * 1.25);
const float beta = 1.0f; // TODO change for PUSCH with CSI
return 10 * log10((f - 1) * beta);
}
/* \brief over-estimate the BSR index, given real_index.
@@ -558,16 +553,10 @@ static int nr_process_mac_pdu(instance_t module_idP,
PH = 38;
}
// in sched_ctrl we set normalized PH wrt MCS and PRBs
long *deltaMCS = ul_bwp->pusch_Config ? ul_bwp->pusch_Config->pusch_PowerControl->deltaMCS : NULL;
sched_ctrl->ph = PH
+ compute_ph_factor(ul_bwp->scs,
sched_pusch->tb_size << 3,
sched_pusch->rbSize,
sched_pusch->nrOfLayers,
sched_pusch->tda_info.nrOfSymbols, // n_symbols
sched_pusch->dmrs_info.num_dmrs_symb * sched_pusch->dmrs_info.N_PRB_DMRS, // n_dmrs
deltaMCS,
true);
sched_ctrl->ph = PH + compute_ph_rb_factor(ul_bwp->scs, sched_pusch->rbSize);
bool hasDeltaMCS = ul_bwp->pusch_Config && ul_bwp->pusch_Config->pusch_PowerControl->deltaMCS;
if (hasDeltaMCS)
sched_ctrl->ph += compute_ph_mcs_factor(sched_pusch);
/* 38.133 Table10.1.18.1-1 */
sched_ctrl->pcmax = PCMAX - 29;
LOG_D(NR_MAC,
@@ -1706,70 +1695,47 @@ static void nr_ue_max_mcs_min_rb(int mu,
AssertFatal(*Rb >= minRb, "illegal Rb %d < minRb %d\n", *Rb, minRb);
AssertFatal(*mcs >= 0 && *mcs <= 28, "illegal MCS %d\n", *mcs);
int tbs_bits = tbs << 3;
NR_sched_pusch_t pot = *sched_pusch; // "potential" PUSCH allocation
pot.tb_size = tbs;
pot.rbSize = *Rb;
pot.mcs = *mcs;
uint16_t R;
uint8_t Qm;
update_ul_ue_R_Qm(*mcs, ul_bwp->mcs_table, ul_bwp->pusch_Config, &R, &Qm);
update_ul_ue_R_Qm(pot.mcs, ul_bwp->mcs_table, ul_bwp->pusch_Config, &R, &Qm);
long *deltaMCS = ul_bwp->pusch_Config ? ul_bwp->pusch_Config->pusch_PowerControl->deltaMCS : NULL;
tbs_bits = nr_compute_tbs(Qm, R, *Rb,
sched_pusch->tda_info.nrOfSymbols,
sched_pusch->dmrs_info.N_PRB_DMRS * sched_pusch->dmrs_info.num_dmrs_symb,
0, // nb_rb_oh
0,
sched_pusch->nrOfLayers);
bool hasDeltaMCS = ul_bwp->pusch_Config && ul_bwp->pusch_Config->pusch_PowerControl->deltaMCS;
int n_dmrs = pot.dmrs_info.N_PRB_DMRS * pot.dmrs_info.num_dmrs_symb;
pot.tb_size = nr_compute_tbs(Qm, R, pot.rbSize, pot.tda_info.nrOfSymbols, n_dmrs, 0, 0, pot.nrOfLayers) >> 3;
int tx_power = compute_ph_rb_factor(mu, pot.rbSize) + (hasDeltaMCS ? compute_ph_mcs_factor(&pot) : 0);
int tx_power = compute_ph_factor(mu,
tbs_bits,
*Rb,
sched_pusch->nrOfLayers,
sched_pusch->tda_info.nrOfSymbols,
sched_pusch->dmrs_info.N_PRB_DMRS * sched_pusch->dmrs_info.num_dmrs_symb,
deltaMCS,
true);
while (ph_limit < tx_power && *Rb > minRb) {
(*Rb)--;
tbs_bits = nr_compute_tbs(Qm, R, *Rb,
sched_pusch->tda_info.nrOfSymbols,
sched_pusch->dmrs_info.N_PRB_DMRS * sched_pusch->dmrs_info.num_dmrs_symb,
0, // nb_rb_oh
0,
sched_pusch->nrOfLayers);
tx_power = compute_ph_factor(mu,
tbs_bits,
*Rb,
sched_pusch->nrOfLayers,
sched_pusch->tda_info.nrOfSymbols,
sched_pusch->dmrs_info.N_PRB_DMRS * sched_pusch->dmrs_info.num_dmrs_symb,
deltaMCS,
true);
LOG_D(NR_MAC, "Checking %d RBs, MCS %d, ph_limit %d, tx_power %d\n",*Rb,*mcs,ph_limit,tx_power);
// reduce first RBs till minimum RB to fulfill PHR constraint while staying
// spectrally efficient
while (ph_limit < tx_power && pot.rbSize > minRb) {
pot.rbSize--;
pot.tb_size = nr_compute_tbs(Qm, R, pot.rbSize, pot.tda_info.nrOfSymbols, n_dmrs, 0, 0, pot.nrOfLayers) >> 3;
tx_power = compute_ph_rb_factor(mu, pot.rbSize) + (hasDeltaMCS ? compute_ph_mcs_factor(&pot) : 0);
LOG_D(NR_MAC, "Checking %d RBs, MCS %d, ph_limit %d, tx_power %d\n", pot.rbSize, pot.mcs, ph_limit, tx_power);
}
while (ph_limit < tx_power && *mcs > 0) {
(*mcs)--;
update_ul_ue_R_Qm(*mcs, ul_bwp->mcs_table, ul_bwp->pusch_Config, &R, &Qm);
tbs_bits = nr_compute_tbs(Qm, R, *Rb,
sched_pusch->tda_info.nrOfSymbols,
sched_pusch->dmrs_info.N_PRB_DMRS * sched_pusch->dmrs_info.num_dmrs_symb,
0, // nb_rb_oh
0,
sched_pusch->nrOfLayers);
tx_power = compute_ph_factor(mu,
tbs_bits,
*Rb,
sched_pusch->nrOfLayers,
sched_pusch->tda_info.nrOfSymbols,
sched_pusch->dmrs_info.N_PRB_DMRS * sched_pusch->dmrs_info.num_dmrs_symb,
deltaMCS,
true);
LOG_D(NR_MAC, "Checking %d RBs, MCS %d, ph_limit %d, tx_power %d\n",*Rb,*mcs,ph_limit,tx_power);
// if this was not enough, further reduce MCS till it is enough
while (ph_limit < tx_power && pot.mcs > 0) {
pot.mcs--;
update_ul_ue_R_Qm(pot.mcs, ul_bwp->mcs_table, ul_bwp->pusch_Config, &R, &Qm);
pot.tb_size = nr_compute_tbs(Qm, R, pot.rbSize, pot.tda_info.nrOfSymbols, n_dmrs, 0, 0, pot.nrOfLayers) >> 3;
tx_power = compute_ph_rb_factor(mu, pot.rbSize) + (hasDeltaMCS ? compute_ph_mcs_factor(&pot) : 0);
LOG_D(NR_MAC, "Checking %d RBs, MCS %d, ph_limit %d, tx_power %d\n", pot.rbSize, pot.mcs, ph_limit, tx_power);
}
if (ph_limit < tx_power)
LOG_D(NR_MAC, "Normalized power %d based on current resources (RBs %d, MCS %d) exceed reported PHR %d (normalized value)\n",
tx_power, *Rb, *mcs, ph_limit);
LOG_D(NR_MAC,
"Normalized power %d based on current resources (RBs %d, MCS %d) exceed reported PHR %d (normalized value)\n",
tx_power,
pot.rbSize,
pot.mcs,
ph_limit);
*Rb = pot.rbSize;
*mcs = pot.mcs;
}
static bool allocate_ul_retransmission(gNB_MAC_INST *nrmac,
@@ -2477,16 +2443,8 @@ void post_process_ulsch(gNB_MAC_INST *nr_mac, post_process_pusch_t *pusch, NR_UE
req->n_pdus += 1;
// Calculate the normalized tx_power for PHR
long *deltaMCS = current_BWP->pusch_Config ? current_BWP->pusch_Config->pusch_PowerControl->deltaMCS : NULL;
int tbs_bits = pusch_pdu->pusch_data.tb_size << 3;
sched_pusch->phr_txpower_calc = compute_ph_factor(current_BWP->scs,
tbs_bits,
sched_pusch->rbSize,
sched_pusch->nrOfLayers,
sched_pusch->tda_info.nrOfSymbols,
sched_pusch->dmrs_info.N_PRB_DMRS * sched_pusch->dmrs_info.num_dmrs_symb,
deltaMCS,
false);
bool hasDeltaMCS = current_BWP->pusch_Config && current_BWP->pusch_Config->pusch_PowerControl->deltaMCS;
sched_pusch->phr_txpower_calc = hasDeltaMCS ? compute_ph_mcs_factor(sched_pusch) : 0;
int tpc = nr_mac_get_tpc(&sched_ctrl->pusch_pc);
LOG_D(NR_MAC,