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/*
* Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The OpenAirInterface Software Alliance licenses this file to You under
* the OAI Public License, Version 1.1 (the "License"); you may not use this file
* except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.openairinterface.org/?page_id=698
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*-------------------------------------------------------------------------------
* For more information about the OpenAirInterface (OAI) Software Alliance:
* contact@openairinterface.org
*/
/*! \file nr_prach_procedures.c
* \brief Implementation of gNB prach procedures from 38.213 LTE specifications
* \author R. Knopp,
* \date 2019
* \version 0.1
* \company Eurecom
* \email: knopp@eurecom.fr
* \note
* \warning
*/
#include "PHY/defs_gNB.h"
#include "PHY/phy_extern.h"
#include "PHY/NR_TRANSPORT/nr_transport.h"
#include "nfapi_nr_interface_scf.h"
#include "fapi_nr_l1.h"
#include "nfapi_pnf.h"
#include "common/utils/LOG/log.h"
#include "common/utils/LOG/vcd_signal_dumper.h"
#include "assertions.h"
#include "msc.h"
#include <time.h>
#include "intertask_interface.h"
extern uint8_t nfapi_mode;
extern int oai_nfapi_nr_rach_ind(nfapi_rach_indication_t *rach_ind);
void L1_nr_prach_procedures(PHY_VARS_gNB *gNB,int frame,int slot,
nfapi_nr_prach_pdu_t *prach_pdu) {
uint16_t max_preamble[4],max_preamble_energy[4],max_preamble_delay[4];
uint16_t i;
gNB->UL_INFO.rach_ind.number_of_pdus=0;
RU_t *ru;
int aa=0;
int ru_aa;
VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_PHY_ENB_PRACH_RX,1);
for (i=0;i<gNB->num_RU;i++) {
ru=gNB->RU_list[i];
for (ru_aa=0,aa=0;ru_aa<ru->nb_rx;ru_aa++,aa++) {
gNB->prach_vars.rxsigF[aa] = gNB->RU_list[i]->prach_rxsigF[ru_aa];
}
}
rx_nr_prach(gNB,
prach_pdu,
frame,
slot,
&max_preamble[0],
&max_preamble_energy[0],
&max_preamble_delay[0]
);
LOG_D(PHY,"[RAPROC] Frame %d, slot %d : Most likely preamble %d, energy %d dB delay %d (prach_energy counter %d)\n",
frame,slot,
max_preamble[0],
max_preamble_energy[0]/10,
max_preamble_delay[0],
gNB->prach_energy_counter);
if ((gNB->prach_energy_counter == 100) &&
(max_preamble_energy[0] > gNB->measurements.prach_I0+100)) {
LOG_I(PHY,"[gNB %d][RAPROC] Frame %d, slot %d Initiating RA procedure with preamble %d, energy %d.%d dB, delay %d\n",
gNB->Mod_id,
frame,
slot,
max_preamble[0],
max_preamble_energy[0]/10,
max_preamble_energy[0]%10,
max_preamble_delay[0]);
T(T_ENB_PHY_INITIATE_RA_PROCEDURE, T_INT(gNB->Mod_id), T_INT(frame), T_INT(slot),
T_INT(max_preamble[0]), T_INT(max_preamble_energy[0]), T_INT(max_preamble_delay[0]));
gNB->UL_INFO.rach_ind.number_of_pdus = 1;
gNB->UL_INFO.rach_ind.pdu_list = &gNB->prach_pdu_indication_list[0];
gNB->UL_INFO.rach_ind.sfn = frame;
gNB->UL_INFO.rach_ind.slot = slot;
gNB->prach_pdu_indication_list[0].phy_cell_id = gNB->gNB_config.cell_config.phy_cell_id.value;
gNB->prach_pdu_indication_list[0].symbol_index = prach_pdu->prach_start_symbol;
gNB->prach_pdu_indication_list[0].slot_index = slot;
gNB->prach_pdu_indication_list[0].freq_index = 0; // single frequency for now
gNB->prach_pdu_indication_list[0].avg_rssi = (max_preamble_energy[0]<631) ? (128+(max_preamble_energy[0]/5)) : 254;
gNB->prach_pdu_indication_list[0].avg_snr = 0xff; // invalid for now
gNB->prach_pdu_indication_list[0].num_preamble = 1;
gNB->prach_pdu_indication_list[0].preamble_list = gNB->preamble_list;
gNB->prach_pdu_indication_list[0].preamble_list[0].preamble_index = max_preamble[0];
gNB->prach_pdu_indication_list[0].preamble_list[0].timing_advance = max_preamble_delay[0];
gNB->prach_pdu_indication_list[0].preamble_list[0].preamble_pwr = 0xffffffff;
}
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++;
VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_PHY_ENB_PRACH_RX,0);
}