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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
2025-04-15 16:43:14 +02:00
parent f3eb713084
commit a3ef5293fb
7 changed files with 22 additions and 13 deletions
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1
common/platform_constants.h
View File

@@ -93,5 +93,6 @@
#define RETURNerror (-1)
#define DEFAULT_NAS_PATH "PWD"
#define UNUSED_VARIABLE(vARIABLE) (void)(vARIABLE)
#define NUM_PRACH_RX_FOR_NOISE_ESTIMATE 100
#endif /* __PLATFORM_CONSTANTS_H__ */

8
openair1/SCHED/prach_procedures.c
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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

6
openair1/SCHED_NR/nr_prach_procedures.c
View File

@@ -145,7 +145,8 @@ void L1_nr_prach_procedures(PHY_VARS_gNB *gNB, int frame, int slot, nfapi_nr_rac
max_preamble_delay[0],
gNB->prach_energy_counter);
if ((gNB->prach_energy_counter == 100) && (max_preamble_energy[0] > gNB->measurements.prach_I0 + gNB->prach_thres)
if ((gNB->prach_energy_counter == NUM_PRACH_RX_FOR_NOISE_ESTIMATE)
&& (max_preamble_energy[0] > gNB->measurements.prach_I0 + gNB->prach_thres)
&& (rach_ind->number_of_pdus < MAX_NUM_NR_RX_RACH_PDUS)) {
LOG_A(NR_PHY,
"[RAPROC] %d.%d Initiating RA procedure with preamble %d, energy %d.%d dB (I0 %d, thres %d), delay %d start symbol "
@@ -185,7 +186,8 @@ void L1_nr_prach_procedures(PHY_VARS_gNB *gNB, int frame, int slot, nfapi_nr_rac
}
gNB->measurements.prach_I0 = ((gNB->measurements.prach_I0*900)>>10) + ((max_preamble_energy[0]*124)>>10);
if (frame==0) LOG_I(PHY,"prach_I0 = %d.%d dB\n",gNB->measurements.prach_I0/10,gNB->measurements.prach_I0%10);
if (gNB->prach_energy_counter < 100) gNB->prach_energy_counter++;
if (gNB->prach_energy_counter < NUM_PRACH_RX_FOR_NOISE_ESTIMATE)
gNB->prach_energy_counter++;
} //if prach_id>0
rach_ind->slot = prach_start_slot;
} // for NUMBER_OF_NR_PRACH_OCCASION_MAX

16
openair2/LAYER2/NR_MAC_gNB/gNB_scheduler.c
View File

@@ -212,14 +212,16 @@ void gNB_dlsch_ulsch_scheduler(module_id_t module_idP, frame_t frame, slot_t slo
nr_mac_update_timers(module_idP, frame, slot);
// This schedules MIB
schedule_nr_mib(module_idP, frame, slot, &sched_info->DL_req);
if (gNB->num_scheduled_prach_rx >= NUM_PRACH_RX_FOR_NOISE_ESTIMATE || get_softmodem_params()->phy_test) {
// This schedules MIB
schedule_nr_mib(module_idP, frame, slot, &sched_info->DL_req);
// This schedules SIB1
// SIB19 will be scheduled if ntn_Config_r17 is initialized
if (IS_SA_MODE(get_softmodem_params())) {
schedule_nr_sib1(module_idP, frame, slot, &sched_info->DL_req, &sched_info->TX_req);
schedule_nr_other_sib(module_idP, frame, slot, &sched_info->DL_req, &sched_info->TX_req);
// This schedules SIB1
// SIB19 will be scheduled if ntn_Config_r17 is initialized
if (IS_SA_MODE(get_softmodem_params())) {
schedule_nr_sib1(module_idP, frame, slot, &sched_info->DL_req, &sched_info->TX_req);
schedule_nr_other_sib(module_idP, frame, slot, &sched_info->DL_req, &sched_info->TX_req);
}
}
// This schedule PRACH if we are not in phy_test mode

1
openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_RA.c
View File

@@ -430,6 +430,7 @@ void schedule_nr_prach(module_id_t module_idP, frame_t frameP, slot_t slotP)
}
}
if(td_index == 0) {
gNB->num_scheduled_prach_rx++;
AssertFatal(UL_tti_req->n_pdus < sizeof(UL_tti_req->pdus_list) / sizeof(UL_tti_req->pdus_list[0]),
"Invalid UL_tti_req->n_pdus %d\n", UL_tti_req->n_pdus);

1
openair2/LAYER2/NR_MAC_gNB/main.c
View File

@@ -275,6 +275,7 @@ void mac_top_init_gNB(ngran_node_t node_type,
RC.nrmac[i]->common_channels[0].pre_ServingCellConfig = scd;
RC.nrmac[i]->first_MIB = true;
RC.nrmac[i]->num_scheduled_prach_rx = 0;
RC.nrmac[i]->common_channels[0].mib = get_new_MIB_NR(scc);
RC.nrmac[i]->cset0_bwp_start = 0;

2
openair2/LAYER2/NR_MAC_gNB/nr_mac_gNB.h
View File

@@ -936,7 +936,7 @@ typedef struct gNB_MAC_INST_s {
pthread_mutex_t sched_lock;
mac_stats_t mac_stats;
uint64_t num_scheduled_prach_rx;
} gNB_MAC_INST;
#endif /*__LAYER2_NR_MAC_GNB_H__ */