263 lines
10 KiB
C
263 lines
10 KiB
C
/*
|
|
* 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 PHY/NR_ESTIMATION/nr_measurements_gNB.c
|
|
* \brief gNB measurement routines
|
|
* \author Ahmed Hussein, G. Casati, K. Saaifan
|
|
* \date 2019
|
|
* \version 0.1
|
|
* \company Fraunhofer IIS
|
|
* \email: ahmed.hussein@iis.fraunhofer.de, guido.casati@iis.fraunhofer.de, khodr.saaifan@iis.fraunhofer.de
|
|
* \note
|
|
* \warning
|
|
*/
|
|
|
|
#include "PHY/types.h"
|
|
#include "PHY/defs_gNB.h"
|
|
#include "nr_ul_estimation.h"
|
|
|
|
#define I0_SKIP_DC 1
|
|
|
|
extern openair0_config_t openair0_cfg[MAX_CARDS];
|
|
|
|
int nr_est_timing_advance_srs(const NR_DL_FRAME_PARMS *frame_parms,
|
|
const int32_t srs_estimated_channel_time[][frame_parms->ofdm_symbol_size]) {
|
|
int timing_advance = 0;
|
|
int max_val = 0;
|
|
|
|
for (int i = 0; i < frame_parms->ofdm_symbol_size; i++) {
|
|
int temp = 0;
|
|
for (int aa = 0; aa < frame_parms->nb_antennas_rx; aa++) {
|
|
int Re = ((c16_t*)srs_estimated_channel_time[aa])[i].r;
|
|
int Im = ((c16_t*)srs_estimated_channel_time[aa])[i].i;
|
|
temp += (Re*Re/2) + (Im*Im/2);
|
|
}
|
|
if (temp > max_val) {
|
|
timing_advance = i;
|
|
max_val = temp;
|
|
}
|
|
}
|
|
|
|
if (timing_advance > frame_parms->ofdm_symbol_size/2) {
|
|
timing_advance = timing_advance - frame_parms->ofdm_symbol_size;
|
|
}
|
|
|
|
// Scale the 16 factor in N_TA calculation in 38.213 section 4.2 according to the used FFT size
|
|
const uint16_t bw_scaling = frame_parms->ofdm_symbol_size >> 7;
|
|
|
|
// do some integer rounding to improve TA accuracy
|
|
int sync_pos_rounded;
|
|
if (timing_advance > 0) {
|
|
sync_pos_rounded = timing_advance + (bw_scaling >> 1) - 1;
|
|
} else {
|
|
sync_pos_rounded = timing_advance - (bw_scaling >> 1) + 1;
|
|
}
|
|
|
|
int timing_advance_update = sync_pos_rounded / bw_scaling;
|
|
|
|
// put timing advance command in 0..63 range
|
|
timing_advance_update += 31;
|
|
|
|
if (timing_advance_update < 0) timing_advance_update = 0;
|
|
if (timing_advance_update > 63) timing_advance_update = 63;
|
|
|
|
return timing_advance_update;
|
|
}
|
|
|
|
void dump_nr_I0_stats(FILE *fd,PHY_VARS_gNB *gNB) {
|
|
|
|
|
|
int min_I0=1000,max_I0=0;
|
|
int amin=0,amax=0;
|
|
fprintf(fd,"Blacklisted PRBs %d/%d\n",gNB->num_ulprbbl,gNB->frame_parms.N_RB_UL);
|
|
for (int i=0; i<gNB->frame_parms.N_RB_UL; i++) {
|
|
if (gNB->ulprbbl[i] > 0) continue;
|
|
|
|
if (gNB->measurements.n0_subband_power_tot_dB[i]<min_I0) {min_I0 = gNB->measurements.n0_subband_power_tot_dB[i]; amin=i;}
|
|
|
|
if (gNB->measurements.n0_subband_power_tot_dB[i]>max_I0) {max_I0 = gNB->measurements.n0_subband_power_tot_dB[i]; amax=i;}
|
|
}
|
|
|
|
for (int i=0; i<gNB->frame_parms.N_RB_UL; i++) {
|
|
if (gNB->ulprbbl[i] ==0) fprintf(fd,"%2d.",gNB->measurements.n0_subband_power_tot_dB[i]-gNB->measurements.n0_subband_power_avg_dB);
|
|
else fprintf(fd," X.");
|
|
if (i%25 == 24) fprintf(fd,"\n");
|
|
}
|
|
fprintf(fd,"\n");
|
|
fprintf(fd,"max_IO = %d (%d), min_I0 = %d (%d), avg_I0 = %d dB",max_I0,amax,min_I0,amin,gNB->measurements.n0_subband_power_avg_dB);
|
|
if (gNB->frame_parms.nb_antennas_rx>1) {
|
|
fprintf(fd,"(");
|
|
for (int aarx=0;aarx<gNB->frame_parms.nb_antennas_rx;aarx++)
|
|
fprintf(fd,"%d.",gNB->measurements.n0_subband_power_avg_perANT_dB[aarx]);
|
|
fprintf(fd,")");
|
|
}
|
|
fprintf(fd,"\nPRACH I0 = %d.%d dB\n",gNB->measurements.prach_I0/10,gNB->measurements.prach_I0%10);
|
|
|
|
|
|
}
|
|
|
|
void gNB_I0_measurements(PHY_VARS_gNB *gNB, int slot, int first_symb, int num_symb, uint32_t rb_mask_ul[14][9])
|
|
{
|
|
NR_DL_FRAME_PARMS *frame_parms = &gNB->frame_parms;
|
|
NR_gNB_COMMON *common_vars = &gNB->common_vars;
|
|
PHY_MEASUREMENTS_gNB *measurements = &gNB->measurements;
|
|
int rb, nb_symb[275]={0};
|
|
|
|
allocCast2D(n0_subband_power,
|
|
unsigned int,
|
|
gNB->measurements.n0_subband_power,
|
|
frame_parms->nb_antennas_rx,
|
|
frame_parms->N_RB_UL,
|
|
false);
|
|
clearArray(gNB->measurements.n0_subband_power, unsigned int);
|
|
allocCast2D(n0_subband_power_dB,
|
|
unsigned int,
|
|
gNB->measurements.n0_subband_power_dB,
|
|
frame_parms->nb_antennas_rx,
|
|
frame_parms->N_RB_UL,
|
|
false);
|
|
|
|
for (int s=first_symb;s<(first_symb+num_symb);s++) {
|
|
int offset0 = ((slot&3)*frame_parms->symbols_per_slot + s) * frame_parms->ofdm_symbol_size;
|
|
for (rb=0; rb<frame_parms->N_RB_UL; rb++) {
|
|
if ((rb_mask_ul[s][rb >> 5] & (1U << (rb & 31))) == 0 && // check that rb was not used in this subframe
|
|
!(I0_SKIP_DC && rb == frame_parms->N_RB_UL >> 1)) { // skip middle PRB because of artificial noise possibly created by FFT
|
|
int offset = offset0 + (frame_parms->first_carrier_offset + (rb*12))%frame_parms->ofdm_symbol_size;
|
|
nb_symb[rb]++;
|
|
for (int aarx=0; aarx<frame_parms->nb_antennas_rx; aarx++) {
|
|
c16_t *ul_ch = &common_vars->rxdataF[aarx][offset];
|
|
int32_t signal_energy;
|
|
if (((frame_parms->N_RB_UL&1) == 1) &&
|
|
(rb==(frame_parms->N_RB_UL>>1))) {
|
|
signal_energy = signal_energy_nodc(ul_ch, 6);
|
|
ul_ch = &common_vars->rxdataF[aarx][offset0];
|
|
signal_energy += signal_energy_nodc(ul_ch, 6);
|
|
} else {
|
|
signal_energy = signal_energy_nodc(ul_ch, 12);
|
|
}
|
|
n0_subband_power[aarx][rb] += signal_energy;
|
|
LOG_D(PHY,"slot %d symbol %d RB %d aarx %d n0_subband_power %d\n", slot, s, rb, aarx, signal_energy);
|
|
} //antenna
|
|
}
|
|
} //rb
|
|
} // symb
|
|
int nb_rb=0;
|
|
int64_t n0_subband_tot=0;
|
|
int32_t n0_subband_tot_perANT[frame_parms->nb_antennas_rx];
|
|
|
|
memset(n0_subband_tot_perANT, 0, sizeof(n0_subband_tot_perANT));
|
|
|
|
for (int rb = 0 ; rb<frame_parms->N_RB_UL;rb++) {
|
|
int32_t n0_subband_tot_perPRB=0;
|
|
if (nb_symb[rb] > 0) {
|
|
for (int aarx=0;aarx<frame_parms->nb_antennas_rx;aarx++) {
|
|
n0_subband_power[aarx][rb] /= nb_symb[rb];
|
|
n0_subband_power_dB[aarx][rb] = dB_fixed(n0_subband_power[aarx][rb]);
|
|
n0_subband_tot_perPRB += n0_subband_power[aarx][rb];
|
|
n0_subband_tot_perANT[aarx] += n0_subband_power[aarx][rb];
|
|
}
|
|
n0_subband_tot_perPRB/=frame_parms->nb_antennas_rx;
|
|
measurements->n0_subband_power_tot_dB[rb] = dB_fixed(n0_subband_tot_perPRB);
|
|
measurements->n0_subband_power_tot_dBm[rb] = measurements->n0_subband_power_tot_dB[rb] - gNB->rx_total_gain_dB - dB_fixed(frame_parms->N_RB_UL);
|
|
LOG_D(PHY,"n0_subband_power_tot_dB[%d] => %d, over %d symbols\n",rb,measurements->n0_subband_power_tot_dB[rb],nb_symb[rb]);
|
|
n0_subband_tot += n0_subband_tot_perPRB;
|
|
nb_rb++;
|
|
}
|
|
}
|
|
if (nb_rb>0) {
|
|
measurements->n0_subband_power_avg_dB = dB_fixed(n0_subband_tot/nb_rb);
|
|
for (int aarx=0;aarx<frame_parms->nb_antennas_rx;aarx++) {
|
|
measurements->n0_subband_power_avg_perANT_dB[aarx] = dB_fixed(n0_subband_tot_perANT[aarx]/nb_rb);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Scope: This function computes the UL SNR from the UL channel estimates
|
|
//
|
|
// Todo:
|
|
// - averaging IIR filter for RX power and noise
|
|
void nr_gnb_measurements(PHY_VARS_gNB *gNB,
|
|
NR_gNB_ULSCH_t *ulsch,
|
|
NR_gNB_PUSCH *pusch_vars,
|
|
unsigned char symbol,
|
|
uint8_t nrOfLayers)
|
|
{
|
|
uint32_t rx_power_tot = 0;
|
|
unsigned short rx_power_avg_dB;
|
|
unsigned short rx_power_tot_dB;
|
|
RU_t *ru = gNB->RU_list[0];
|
|
double rx_gain, rx_gain_offset;
|
|
if (ru && ru->rfdevice.openair0_cfg) {
|
|
rx_gain = ru->rfdevice.openair0_cfg->rx_gain[0];
|
|
rx_gain_offset = ru->rfdevice.openair0_cfg->rx_gain_offset[0];
|
|
} else if (ru && ru->ifdevice.openair0_cfg) {
|
|
rx_gain = ru->ifdevice.openair0_cfg->rx_gain[0];
|
|
rx_gain_offset = ru->ifdevice.openair0_cfg->rx_gain_offset[0];
|
|
} else {
|
|
LOG_W(NR_PHY, "no device for rx gain, take arbitrary gain = 1)\n");
|
|
rx_gain = 1;
|
|
rx_gain_offset = 0;
|
|
}
|
|
PHY_MEASUREMENTS_gNB *meas = &gNB->measurements;
|
|
NR_DL_FRAME_PARMS *fp = &gNB->frame_parms;
|
|
int ch_offset = fp->ofdm_symbol_size * symbol;
|
|
int N_RB_UL = ulsch->harq_process->ulsch_pdu.rb_size;
|
|
ulsch_measurements_gNB *ulsch_measurements = &ulsch->ulsch_measurements;
|
|
|
|
int rx_power[fp->nb_antennas_rx];
|
|
int rx_spatial_power[nrOfLayers][fp->nb_antennas_rx];
|
|
for (int aarx = 0; aarx < fp->nb_antennas_rx; aarx++){
|
|
rx_power[aarx] = 0;
|
|
|
|
for (int aatx = 0; aatx < nrOfLayers; aatx++){
|
|
rx_spatial_power[aatx][aarx] =
|
|
(signal_energy_nodc((c16_t*)&pusch_vars->ul_ch_estimates[aatx * fp->nb_antennas_rx + aarx][ch_offset],
|
|
N_RB_UL * NR_NB_SC_PER_RB));
|
|
|
|
if (rx_spatial_power[aatx][aarx] < 0) {
|
|
rx_spatial_power[aatx][aarx] = 0;
|
|
}
|
|
|
|
rx_power[aarx] += rx_spatial_power[aatx][aarx];
|
|
}
|
|
LOG_D(PHY, "[RNTI %04x] RX power in antenna %d = %d\n", ulsch->rnti, aarx, rx_power[aarx]);
|
|
|
|
rx_power_tot += rx_power[aarx];
|
|
}
|
|
|
|
rx_power_tot_dB = (unsigned short)dB_fixed(rx_power_tot);
|
|
rx_power_avg_dB = rx_power_tot_dB;
|
|
|
|
ulsch_measurements->wideband_cqi_tot = dB_fixed2(rx_power_tot, meas->n0_power_tot);
|
|
ulsch_measurements->rx_rssi_dBm =
|
|
rx_power_avg_dB + 30 - SQ15_SQUARED_NORM_FACTOR_DB - (rx_gain - rx_gain_offset) - dB_fixed(fp->ofdm_symbol_size);
|
|
|
|
LOG_D(PHY,
|
|
"[RNTI %04x] RSSI %d dBm/RE, RSSI (digital) %d dB (N_RB_UL %d), WBand CQI tot %d dB, N0 Power tot %d, RX Power tot %d\n",
|
|
ulsch->rnti,
|
|
ulsch_measurements->rx_rssi_dBm,
|
|
rx_power_avg_dB,
|
|
N_RB_UL,
|
|
ulsch_measurements->wideband_cqi_tot,
|
|
meas->n0_power_tot,
|
|
rx_power_tot);
|
|
}
|