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openairinterface5g/openair1/PHY/LTE_TRANSPORT/initial_sync.c
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/*******************************************************************************
OpenAirInterface
Copyright(c) 1999 - 2014 Eurecom
OpenAirInterface is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
OpenAirInterface is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with OpenAirInterface.The full GNU General Public License is
included in this distribution in the file called "COPYING". If not,
see <http://www.gnu.org/licenses/>.
Contact Information
OpenAirInterface Admin: openair_admin@eurecom.fr
OpenAirInterface Tech : openair_tech@eurecom.fr
OpenAirInterface Dev : openair4g-devel@eurecom.fr
Address : Eurecom, Campus SophiaTech, 450 Route des Chappes, CS 50193 - 06904 Biot Sophia Antipolis cedex, FRANCE
*******************************************************************************/
/*! \file PHY/LTE_TRANSPORT/initial_sync.c
* \brief Routines for initial UE synchronization procedure (PSS,SSS,PBCH and frame format detection)
* \author R. Knopp, F. Kaltenberger
* \date 2011
* \version 0.1
* \company Eurecom
* \email: knopp@eurecom.fr,kaltenberger@eurecom.fr
* \note
* \warning
*/
#include "PHY/types.h"
#include "PHY/defs.h"
#include "PHY/extern.h"
#include "SCHED/defs.h"
#include "SCHED/extern.h"
#include "defs.h"
#include "extern.h"
#ifdef EXMIMO
#include "gain_control.h"
#endif
#define DEBUG_INITIAL_SYNCH
int pbch_detection(PHY_VARS_UE *phy_vars_ue, runmode_t mode) {
uint8_t l,pbch_decoded,frame_mod4,pbch_tx_ant,dummy;
LTE_DL_FRAME_PARMS *frame_parms=&phy_vars_ue->lte_frame_parms;
char phich_resource[6];
#ifdef DEBUG_INITIAL_SYNCH
LOG_I(PHY,"[UE%d] Initial sync: starting PBCH detection (rx_offset %d)\n",phy_vars_ue->Mod_id,
phy_vars_ue->rx_offset);
#endif
for (l=0;l<frame_parms->symbols_per_tti/2;l++) {
slot_fep(phy_vars_ue,
l,
1,
phy_vars_ue->rx_offset,
0);
}
slot_fep(phy_vars_ue,
0,
2,
phy_vars_ue->rx_offset,
0);
lte_ue_measurements(phy_vars_ue,
phy_vars_ue->rx_offset,
0,
0);
#ifdef DEBUG_INITIAL_SYNCH
LOG_I(PHY,"[UE %d][initial sync] RX RSSI %d dBm, digital (%d, %d) dB, linear (%d, %d), avg rx power %d dB (%d lin), RX gain %d dB\n",
phy_vars_ue->Mod_id,
phy_vars_ue->PHY_measurements.rx_rssi_dBm[0] - ((phy_vars_ue->lte_frame_parms.nb_antennas_rx==2) ? 3 : 0),
phy_vars_ue->PHY_measurements.rx_power_dB[0][0],
phy_vars_ue->PHY_measurements.rx_power_dB[0][1],
phy_vars_ue->PHY_measurements.rx_power[0][0],
phy_vars_ue->PHY_measurements.rx_power[0][1],
phy_vars_ue->PHY_measurements.rx_power_avg_dB[0],
phy_vars_ue->PHY_measurements.rx_power_avg[0],
phy_vars_ue->rx_total_gain_dB);
LOG_I(PHY,"[UE %d][initial sync] N0 %d dBm digital (%d, %d) dB, linear (%d, %d), avg noise power %d dB (%d lin)\n",
phy_vars_ue->Mod_id,
phy_vars_ue->PHY_measurements.n0_power_tot_dBm,
phy_vars_ue->PHY_measurements.n0_power_dB[0],
phy_vars_ue->PHY_measurements.n0_power_dB[1],
phy_vars_ue->PHY_measurements.n0_power[0],
phy_vars_ue->PHY_measurements.n0_power[1],
phy_vars_ue->PHY_measurements.n0_power_avg_dB,
phy_vars_ue->PHY_measurements.n0_power_avg);
#endif
pbch_decoded = 0;
for (frame_mod4=0;frame_mod4<4;frame_mod4++) {
pbch_tx_ant = rx_pbch(&phy_vars_ue->lte_ue_common_vars,
phy_vars_ue->lte_ue_pbch_vars[0],
frame_parms,
0,
SISO,
frame_mod4);
if ((pbch_tx_ant>0) && (pbch_tx_ant<=2)) {
pbch_decoded = 1;
break;
}
pbch_tx_ant = rx_pbch(&phy_vars_ue->lte_ue_common_vars,
phy_vars_ue->lte_ue_pbch_vars[0],
frame_parms,
0,
ALAMOUTI,
frame_mod4);
if ((pbch_tx_ant>0) && (pbch_tx_ant<=2)) {
pbch_decoded = 1;
break;
}
}
if (pbch_decoded) {
frame_parms->nb_antennas_tx_eNB = pbch_tx_ant;
// set initial transmission mode to 1 or 2 depending on number of detected TX antennas
frame_parms->mode1_flag = (pbch_tx_ant==1);
// openair_daq_vars.dlsch_transmission_mode = (pbch_tx_ant>1) ? 2 : 1;
// flip byte endian on 24-bits for MIB
// dummy = phy_vars_ue->lte_ue_pbch_vars[0]->decoded_output[0];
// phy_vars_ue->lte_ue_pbch_vars[0]->decoded_output[0] = phy_vars_ue->lte_ue_pbch_vars[0]->decoded_output[2];
// phy_vars_ue->lte_ue_pbch_vars[0]->decoded_output[2] = dummy;
// now check for Bandwidth of Cell
dummy = (phy_vars_ue->lte_ue_pbch_vars[0]->decoded_output[2]>>5)&7;
switch (dummy) {
case 0 :
frame_parms->N_RB_DL = 6;
break;
case 1 :
frame_parms->N_RB_DL = 15;
break;
case 2 :
frame_parms->N_RB_DL = 25;
break;
case 3 :
frame_parms->N_RB_DL = 50;
break;
case 4 :
frame_parms->N_RB_DL = 75;
break;
case 5:
frame_parms->N_RB_DL = 100;
break;
default:
LOG_E(PHY,"[UE%d] Initial sync: PBCH decoding: Unknown N_RB_DL\n",phy_vars_ue->Mod_id);
return -1;
break;
}
#ifndef USER_MODE
if (frame_parms->N_RB_DL != 25) {
LOG_E(PHY,"[UE%d] Initial sync: PBCH decoding: Detected NB_RB %d, but CBMIMO1 can only handle NB_RB=25\n",phy_vars_ue->Mod_id,frame_parms->N_RB_DL);
return -1;
}
#endif
// now check for PHICH parameters
frame_parms->phich_config_common.phich_duration = (PHICH_DURATION_t)((phy_vars_ue->lte_ue_pbch_vars[0]->decoded_output[2]>>4)&1);
dummy = (phy_vars_ue->lte_ue_pbch_vars[0]->decoded_output[2]>>2)&3;
switch (dummy) {
case 0:
frame_parms->phich_config_common.phich_resource = oneSixth;
sprintf(phich_resource,"1/6");
break;
case 1:
frame_parms->phich_config_common.phich_resource = half;
sprintf(phich_resource,"1/2");
break;
case 2:
frame_parms->phich_config_common.phich_resource = one;
sprintf(phich_resource,"1");
break;
case 3:
frame_parms->phich_config_common.phich_resource = two;
sprintf(phich_resource,"2");
break;
default:
LOG_E(PHY,"[UE%d] Initial sync: Unknown PHICH_DURATION\n",phy_vars_ue->Mod_id);
return -1;
break;
}
phy_vars_ue->frame_rx = (((phy_vars_ue->lte_ue_pbch_vars[0]->decoded_output[2]&3)<<6) + (phy_vars_ue->lte_ue_pbch_vars[0]->decoded_output[1]>>2))<<2;
phy_vars_ue->frame_rx += frame_mod4;
#ifndef USER_MODE
// one frame delay
phy_vars_ue->frame_rx ++;
#endif
phy_vars_ue->frame_tx = phy_vars_ue->frame_rx;
#ifdef DEBUG_INITIAL_SYNCH
LOG_I(PHY,"[UE%d] Initial sync: pbch decoded sucessfully mode1_flag %d, tx_ant %d, frame %d, N_RB_DL %d, phich_duration %d, phich_resource %s!\n",
phy_vars_ue->Mod_id,
frame_parms->mode1_flag,
pbch_tx_ant,
phy_vars_ue->frame_rx,
frame_parms->N_RB_DL,
frame_parms->phich_config_common.phich_duration,
phich_resource); //frame_parms->phich_config_common.phich_resource);
#endif
return(0);
}
else {
return(-1);
}
}
int initial_sync(PHY_VARS_UE *phy_vars_ue, runmode_t mode) {
uint32_t sync_pos,sync_pos2,sync_pos_slot;
int32_t metric_fdd_ncp=0,metric_fdd_ecp=0,metric_tdd_ncp=0,metric_tdd_ecp=0;
uint8_t phase_fdd_ncp,phase_fdd_ecp,phase_tdd_ncp,phase_tdd_ecp;
uint8_t flip_fdd_ncp,flip_fdd_ecp,flip_tdd_ncp,flip_tdd_ecp;
// uint16_t Nid_cell_fdd_ncp=0,Nid_cell_fdd_ecp=0,Nid_cell_tdd_ncp=0,Nid_cell_tdd_ecp=0;
LTE_DL_FRAME_PARMS *frame_parms = &phy_vars_ue->lte_frame_parms;
// uint8_t i;
int ret=-1;
int aarx,rx_power=0;
// LOG_I(PHY,"**************************************************************\n");
// First try FDD normal prefix
frame_parms->Ncp=NORMAL;
frame_parms->frame_type=FDD;
init_frame_parms(frame_parms,1);
sync_pos = lte_sync_time(phy_vars_ue->lte_ue_common_vars.rxdata,
frame_parms,
(int *)&phy_vars_ue->lte_ue_common_vars.eNb_id);
if (sync_pos >= frame_parms->nb_prefix_samples)
sync_pos2 = sync_pos - frame_parms->nb_prefix_samples;
else
sync_pos2 = sync_pos + FRAME_LENGTH_COMPLEX_SAMPLES - frame_parms->nb_prefix_samples;
#ifdef DEBUG_INITIAL_SYNCH
LOG_I(PHY,"[UE%d] Initial sync : Estimated PSS position %d, Nid2 %d\n",phy_vars_ue->Mod_id,sync_pos,phy_vars_ue->lte_ue_common_vars.eNb_id);
#endif
for (aarx=0; aarx<frame_parms->nb_antennas_rx; aarx++)
rx_power += signal_energy(&phy_vars_ue->lte_ue_common_vars.rxdata[aarx][sync_pos2],
frame_parms->ofdm_symbol_size+frame_parms->nb_prefix_samples);
phy_vars_ue->PHY_measurements.rx_power_avg_dB[0] = dB_fixed(rx_power/frame_parms->nb_antennas_rx);
#ifdef DEBUG_INITIAL_SYNCH
LOG_I(PHY,"[UE%d] Initial sync : Estimated power: %d dB\n",phy_vars_ue->Mod_id,phy_vars_ue->PHY_measurements.rx_power_avg_dB[0] );
#endif
#ifdef EXMIMO
if ((openair_daq_vars.rx_gain_mode == DAQ_AGC_ON) &&
(mode != rx_calib_ue) && (mode != rx_calib_ue_med) && (mode != rx_calib_ue_byp) )
//phy_adjust_gain(phy_vars_ue,0);
gain_control_all(phy_vars_ue->PHY_measurements.rx_power_avg_dB[0],0);
#else
phy_adjust_gain(phy_vars_ue,0);
#endif
// SSS detection
// PSS is hypothesized in last symbol of first slot in Frame
sync_pos_slot = (frame_parms->samples_per_tti>>1) - frame_parms->ofdm_symbol_size - frame_parms->nb_prefix_samples;
if (sync_pos2 >= sync_pos_slot)
phy_vars_ue->rx_offset = sync_pos2 - sync_pos_slot;
else
phy_vars_ue->rx_offset = FRAME_LENGTH_COMPLEX_SAMPLES + sync_pos2 - sync_pos_slot;
if (((sync_pos2 - sync_pos_slot) >=0 ) &&
((sync_pos2 - sync_pos_slot) < ((FRAME_LENGTH_COMPLEX_SAMPLES-frame_parms->samples_per_tti/2)))) {
#ifdef DEBUG_INITIAL_SYNCH
LOG_I(PHY,"Calling sss detection (FDD normal CP)\n");
#endif
rx_sss(phy_vars_ue,&metric_fdd_ncp,&flip_fdd_ncp,&phase_fdd_ncp);
frame_parms->nushift = frame_parms->Nid_cell%6;
if (flip_fdd_ncp==1)
phy_vars_ue->rx_offset += (FRAME_LENGTH_COMPLEX_SAMPLES>>1);
init_frame_parms(&phy_vars_ue->lte_frame_parms,1);
lte_gold(frame_parms,phy_vars_ue->lte_gold_table[0],frame_parms->Nid_cell);
ret = pbch_detection(phy_vars_ue,mode);
#ifdef DEBUG_INITIAL_SYNCH
LOG_I(PHY,"FDD Normal prefix: CellId %d metric %d, phase %d, flip %d, pbch %d\n",
frame_parms->Nid_cell,metric_fdd_ncp,phase_fdd_ncp,flip_fdd_ncp,ret);
#endif
}
else {
#ifdef DEBUG_INITIAL_SYNCH
LOG_I(PHY,"FDD Normal prefix: SSS error condition: sync_pos %d, sync_pos_slot %d\n", sync_pos, sync_pos_slot);
#endif
}
if (ret==-1) {
// Now FDD extended prefix
frame_parms->Ncp=EXTENDED;
frame_parms->frame_type=FDD;
init_frame_parms(frame_parms,1);
if (sync_pos < frame_parms->nb_prefix_samples)
sync_pos2 = sync_pos + FRAME_LENGTH_COMPLEX_SAMPLES - frame_parms->nb_prefix_samples;
else
sync_pos2 = sync_pos - frame_parms->nb_prefix_samples;
// PSS is hypothesized in last symbol of first slot in Frame
sync_pos_slot = (frame_parms->samples_per_tti>>1) - frame_parms->ofdm_symbol_size - (frame_parms->nb_prefix_samples);
if (sync_pos2 >= sync_pos_slot)
phy_vars_ue->rx_offset = sync_pos2 - sync_pos_slot;
else
phy_vars_ue->rx_offset = FRAME_LENGTH_COMPLEX_SAMPLES + sync_pos2 - sync_pos_slot;
//msg("nb_prefix_samples %d, rx_offset %d\n",frame_parms->nb_prefix_samples,phy_vars_ue->rx_offset);
if (((sync_pos2 - sync_pos_slot) >=0 ) &&
((sync_pos2 - sync_pos_slot) < ((FRAME_LENGTH_COMPLEX_SAMPLES-frame_parms->samples_per_tti/2)))) {
rx_sss(phy_vars_ue,&metric_fdd_ecp,&flip_fdd_ecp,&phase_fdd_ecp);
frame_parms->nushift = frame_parms->Nid_cell%6;
if (flip_fdd_ecp==1)
phy_vars_ue->rx_offset += (FRAME_LENGTH_COMPLEX_SAMPLES>>1);
init_frame_parms(&phy_vars_ue->lte_frame_parms,1);
lte_gold(frame_parms,phy_vars_ue->lte_gold_table[0],frame_parms->Nid_cell);
ret = pbch_detection(phy_vars_ue,mode);
#ifdef DEBUG_INITIAL_SYNCH
LOG_I(PHY,"FDD Extended prefix: CellId %d metric %d, phase %d, flip %d, pbch %d\n",
frame_parms->Nid_cell,metric_fdd_ecp,phase_fdd_ecp,flip_fdd_ecp,ret);
#endif
}
else {
#ifdef DEBUG_INITIAL_SYNCH
LOG_I(PHY,"FDD Extended prefix: SSS error condition: sync_pos %d, sync_pos_slot %d\n", sync_pos, sync_pos_slot);
#endif
}
if (ret==-1) {
// Now TDD normal prefix
frame_parms->Ncp=NORMAL;
frame_parms->frame_type=TDD;
init_frame_parms(frame_parms,1);
if (sync_pos >= frame_parms->nb_prefix_samples)
sync_pos2 = sync_pos - frame_parms->nb_prefix_samples;
else
sync_pos2 = sync_pos + FRAME_LENGTH_COMPLEX_SAMPLES - frame_parms->nb_prefix_samples;
// PSS is hypothesized in 2nd symbol of third slot in Frame (S-subframe)
sync_pos_slot = frame_parms->samples_per_tti +
(frame_parms->ofdm_symbol_size<<1) +
frame_parms->nb_prefix_samples0 +
(frame_parms->nb_prefix_samples);
if (sync_pos2 >= sync_pos_slot)
phy_vars_ue->rx_offset = sync_pos2 - sync_pos_slot;
else
phy_vars_ue->rx_offset = (FRAME_LENGTH_COMPLEX_SAMPLES>>1) + sync_pos2 - sync_pos_slot;
/*if (((sync_pos2 - sync_pos_slot) >=0 ) &&
((sync_pos2 - sync_pos_slot) < ((FRAME_LENGTH_COMPLEX_SAMPLES-frame_parms->samples_per_tti/2)))) {*/
rx_sss(phy_vars_ue,&metric_tdd_ncp,&flip_tdd_ncp,&phase_tdd_ncp);
if (flip_tdd_ncp==1)
phy_vars_ue->rx_offset += (FRAME_LENGTH_COMPLEX_SAMPLES>>1);
frame_parms->nushift = frame_parms->Nid_cell%6;
init_frame_parms(&phy_vars_ue->lte_frame_parms,1);
lte_gold(frame_parms,phy_vars_ue->lte_gold_table[0],frame_parms->Nid_cell);
ret = pbch_detection(phy_vars_ue,mode);
#ifdef DEBUG_INITIAL_SYNCH
LOG_I(PHY,"TDD Normal prefix: CellId %d metric %d, phase %d, flip %d, pbch %d\n",
frame_parms->Nid_cell,metric_tdd_ncp,phase_tdd_ncp,flip_tdd_ncp,ret);
#endif
/*}
else {
#ifdef DEBUG_INITIAL_SYNCH
LOG_I(PHY,"TDD Normal prefix: SSS error condition: sync_pos %d, sync_pos_slot %d\n", sync_pos, sync_pos_slot);
#endif
}*/
if (ret==-1) {
// Now TDD extended prefix
frame_parms->Ncp=EXTENDED;
frame_parms->frame_type=TDD;
init_frame_parms(frame_parms,1);
sync_pos2 = sync_pos - frame_parms->nb_prefix_samples;
if (sync_pos >= frame_parms->nb_prefix_samples)
sync_pos2 = sync_pos - frame_parms->nb_prefix_samples;
else
sync_pos2 = sync_pos + FRAME_LENGTH_COMPLEX_SAMPLES - frame_parms->nb_prefix_samples;
// PSS is hypothesized in 2nd symbol of third slot in Frame (S-subframe)
sync_pos_slot = frame_parms->samples_per_tti + (frame_parms->ofdm_symbol_size<<1) + (frame_parms->nb_prefix_samples<<1);
if (sync_pos2 >= sync_pos_slot)
phy_vars_ue->rx_offset = sync_pos2 - sync_pos_slot;
else
phy_vars_ue->rx_offset = (FRAME_LENGTH_COMPLEX_SAMPLES>>1) + sync_pos2 - sync_pos_slot;
/*if (((sync_pos2 - sync_pos_slot) >=0 ) &&
((sync_pos2 - sync_pos_slot) < ((FRAME_LENGTH_COMPLEX_SAMPLES-frame_parms->samples_per_tti/2)))) {*/
rx_sss(phy_vars_ue,&metric_tdd_ecp,&flip_tdd_ecp,&phase_tdd_ecp);
frame_parms->nushift = frame_parms->Nid_cell%6;
if (flip_tdd_ecp==1)
phy_vars_ue->rx_offset += (FRAME_LENGTH_COMPLEX_SAMPLES>>1);
init_frame_parms(&phy_vars_ue->lte_frame_parms,1);
lte_gold(frame_parms,phy_vars_ue->lte_gold_table[0],frame_parms->Nid_cell);
ret = pbch_detection(phy_vars_ue,mode);
#ifdef DEBUG_INITIAL_SYNCH
LOG_I(PHY,"TDD Extended prefix: CellId %d metric %d, phase %d, flip %d, pbch %d\n",
frame_parms->Nid_cell,metric_tdd_ecp,phase_tdd_ecp,flip_tdd_ecp,ret);
#endif
/*}
else {
#ifdef DEBUG_INITIAL_SYNCH
LOG_I(PHY,"TDD Extended prefix: SSS error condition: sync_pos %d, sync_pos_slot %d\n", sync_pos, sync_pos_slot);
#endif
}*/
}
}
}
if (ret==0) { // PBCH found so indicate sync to higher layers and configure frame parameters
#ifdef DEBUG_INITIAL_SYNCH
LOG_I(PHY,"[PHY][UE%d] In synch, rx_offset %d samples\n",phy_vars_ue->Mod_id, phy_vars_ue->rx_offset);
#endif
#ifdef OPENAIR2
LOG_I(PHY,"[PHY][UE%d] Sending synch status to higher layers\n",phy_vars_ue->Mod_id);
//mac_resynch();
mac_xface->dl_phy_sync_success(phy_vars_ue->Mod_id,phy_vars_ue->frame_rx,0,1);//phy_vars_ue->lte_ue_common_vars.eNb_id);
#endif //OPENAIR2
generate_pcfich_reg_mapping(frame_parms);
generate_phich_reg_mapping(frame_parms);
// init_prach625(frame_parms);
phy_vars_ue->UE_mode[0] = PRACH;
//phy_vars_ue->lte_ue_pbch_vars[0]->pdu_errors=0;
phy_vars_ue->lte_ue_pbch_vars[0]->pdu_errors_conseq=0;
//phy_vars_ue->lte_ue_pbch_vars[0]->pdu_errors_last=0;
}
else {
#ifdef DEBUG_INITIAL_SYNC
LOG_I(PHY,"[UE%d] Initial sync : PBCH not ok\n",phy_vars_ue->Mod_id);
LOG_I(PHY,"[UE%d] Initial sync : Estimated PSS position %d, Nid2 %d\n",phy_vars_ue->Mod_id,sync_pos,phy_vars_ue->lte_ue_common_vars.eNb_id);
/* LOG_I(PHY,"[UE%d] Initial sync: (metric fdd_ncp %d (%d), metric fdd_ecp %d (%d), metric_tdd_ncp %d (%d), metric_tdd_ecp %d (%d))\n",
phy_vars_ue->Mod_id,
metric_fdd_ncp,Nid_cell_fdd_ncp,
metric_fdd_ecp,Nid_cell_fdd_ecp,
metric_tdd_ncp,Nid_cell_tdd_ncp,
metric_tdd_ecp,Nid_cell_tdd_ecp);*/
LOG_I(PHY,"[UE%d] Initial sync : Estimated Nid_cell %d, Frame_type %d\n",phy_vars_ue->Mod_id,
frame_parms->Nid_cell,frame_parms->frame_type);
#endif
phy_vars_ue->UE_mode[0] = NOT_SYNCHED;
phy_vars_ue->lte_ue_pbch_vars[0]->pdu_errors_last=phy_vars_ue->lte_ue_pbch_vars[0]->pdu_errors;
phy_vars_ue->lte_ue_pbch_vars[0]->pdu_errors++;
phy_vars_ue->lte_ue_pbch_vars[0]->pdu_errors_conseq++;
}
return ret;
}
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