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Add Delay Mechanism for Initial MIB/SIB Transmission in gNB Scheduler

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This commit introduces a delay mechanism for the first MIB/SIB transmission
in the gNB scheduler to allow PRACH noise estimate to converge stabilize
before first PRACH preamble reception.

Key changes:
- Added the `num_scheduled_prach_rx` variable to gNB_MAC_INST to keep track
  of total number scheduled of PRACH receptions. Using uint64_t type to avoid
  overflow.
- Updated the `gNB_dlsch_ulsch_scheduler` function to conditionally schedule
  MIB/SIB transmissions if `num_scheduled_prach_rx` is at least 100.
  The value comes from OAIs implementation of PRACH noise estimate.
This commit is contained in:
Bartosz Podrygajlo
2025-04-18 10:26:36 +02:00
parent f3eb713084
commit a3ef5293fb
7 changed files with 22 additions and 13 deletions
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openair1/SCHED/prach_procedures.c
+5 -3
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@@ -120,7 +120,8 @@ void prach_procedures(PHY_VARS_eNB *eNB,
*/
if (eNB->frame_parms.prach_emtc_config_common.prach_ConfigInfo.prach_CElevel_enable[0] == 1) {
if ((eNB->prach_energy_counter == 100) && (max_preamble_energy[0] > eNB->measurements.prach_I0 + eNB->prach_DTX_threshold_emtc[0])) {
if ((eNB->prach_energy_counter == NUM_PRACH_RX_FOR_NOISE_ESTIMATE)
&& (max_preamble_energy[0] > eNB->measurements.prach_I0 + eNB->prach_DTX_threshold_emtc[0])) {
eNB->UL_INFO.rach_ind_br.rach_indication_body.number_of_preambles++;
eNB->preamble_list_br[ind].preamble_rel8.timing_advance = max_preamble_delay[ind]; //
eNB->preamble_list_br[ind].preamble_rel8.preamble = max_preamble[ind];
@@ -142,7 +143,7 @@ void prach_procedures(PHY_VARS_eNB *eNB,
}
} */// ce_level
} else {
if ((eNB->prach_energy_counter == 100) &&
if ((eNB->prach_energy_counter == NUM_PRACH_RX_FOR_NOISE_ESTIMATE) &&
(max_preamble_energy[0] > eNB->measurements.prach_I0+eNB->prach_DTX_threshold)) {
LOG_D(PHY,"[eNB %d/%d][RAPROC] Frame %d, subframe %d Initiating RA procedure with preamble %d, energy %d.%d dB, delay %d\n",
eNB->Mod_id,
@@ -186,7 +187,8 @@ void prach_procedures(PHY_VARS_eNB *eNB,
if (frame==0) LOG_D(PHY,"prach_I0 = %d.%d dB\n",eNB->measurements.prach_I0/10,eNB->measurements.prach_I0%10);
if (eNB->prach_energy_counter < 100) eNB->prach_energy_counter++;
if (eNB->prach_energy_counter < NUM_PRACH_RX_FOR_NOISE_ESTIMATE)
eNB->prach_energy_counter++;
}
} // else br_flag