lte_eNB_measurements.c 9.44 KiB
/*******************************************************************************
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Copyright(c) 1999 - 2014 Eurecom
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*******************************************************************************/
#include "PHY/defs.h"
#include "PHY/extern.h"
#include "PHY/sse_intrin.h"
//#define k1 1000
#define k1 1024
#define k2 (1024-k1)
int32_t rx_power_avg_eNB[3][3];
void lte_eNB_I0_measurements(PHY_VARS_eNB *phy_vars_eNB,
int subframe,
unsigned char eNB_id,
unsigned char clear)
{
LTE_eNB_COMMON *eNB_common_vars = &phy_vars_eNB->lte_eNB_common_vars;
LTE_DL_FRAME_PARMS *frame_parms = &phy_vars_eNB->lte_frame_parms;
PHY_MEASUREMENTS_eNB *phy_measurements = &phy_vars_eNB->PHY_measurements_eNB[eNB_id];
int32_t *rb_mask = phy_vars_eNB->rb_mask_ul;
uint32_t aarx,rx_power_correction;
uint32_t rb;
int32_t *ul_ch;
int32_t n0_power_tot;
int len;
int offset;
int Nsymb = (frame_parms->Ncp==NORMAL)?14:12;
// noise measurements
// for the moment we measure the noise on the 7th OFDM symbol (in S subframe)
phy_measurements->n0_power_tot = 0;
for (aarx=0; aarx<frame_parms->nb_antennas_rx; aarx++) {
if (clear == 1)
phy_measurements->n0_power[aarx]=0;
phy_measurements->n0_power[aarx] = ((k1*signal_energy(&eNB_common_vars->rxdata[eNB_id][aarx][(frame_parms->samples_per_tti<<1) -frame_parms->ofdm_symbol_size], frame_parms->ofdm_symbol_size)) + k2*phy_measurements->n0_power[aarx])>>10;
//phy_measurements->n0_power[aarx] = (phy_measurements->n0_power[aarx]) * 12*frame_parms->N_RB_DL)/(frame_parms->ofdm_symbol_size);
phy_measurements->n0_power_dB[aarx] = (unsigned short) dB_fixed(phy_measurements->n0_power[aarx]);
phy_measurements->n0_power_tot += phy_measurements->n0_power[aarx];
}
phy_measurements->n0_power_tot_dB = (unsigned short) dB_fixed(phy_measurements->n0_power_tot);
phy_measurements->n0_power_tot_dBm = phy_measurements->n0_power_tot_dB - phy_vars_eNB->rx_total_gain_eNB_dB;
// printf("n0_power %d\n",phy_measurements->n0_power_tot_dB);
for (rb=0; rb<frame_parms->N_RB_UL; rb++) {
n0_power_tot=0;
if ((rb_mask[rb>>5]&(1<<(rb&31))) == 0) { // check that rb was not used in this subframe
for (aarx=0; aarx<frame_parms->nb_antennas_rx; aarx++) {
// select the 7th symbol in an uplink subframe
offset = (frame_parms->first_carrier_offset + (rb*12))%frame_parms->ofdm_symbol_size;
offset += (7*frame_parms->ofdm_symbol_size);//(((Nsymb*subframe)+7)*frame_parms->ofdm_symbol_size);
ul_ch = &eNB_common_vars->rxdataF[eNB_id][aarx][offset];
len = 12;
// just do first half of middle PRB for odd number of PRBs
if (((frame_parms->N_RB_UL&1) == 1) &&
(rb==(frame_parms->N_RB_UL>>1))) {
len=6;
}
if (clear == 1)
phy_measurements->n0_subband_power[aarx][rb]=0;
AssertFatal(ul_ch, "RX signal buffer (freq) problem");
phy_measurements->n0_subband_power[aarx][rb] = signal_energy_nodc(ul_ch,len);
//((k1*(signal_energy_nodc(ul_ch,len)))
// + (k2*phy_measurements->n0_subband_power[aarx][rb]));
phy_measurements->n0_subband_power_dB[aarx][rb] = dB_fixed(phy_measurements->n0_subband_power[aarx][rb]);
// printf("subframe %d (%d): eNb %d, aarx %d, rb %d len %d: energy %d (%d dB)\n",subframe,offset,eNB_id,aarx,rb,len,signal_energy_nodc(ul_ch,len),
// phy_measurements->n0_subband_power_dB[aarx][rb]);
n0_power_tot += phy_measurements->n0_subband_power[aarx][rb];
}
phy_measurements->n0_subband_power_tot_dB[rb] = dB_fixed(n0_power_tot);
phy_measurements->n0_subband_power_tot_dBm[rb] = phy_measurements->n0_subband_power_tot_dB[rb] - phy_vars_eNB->rx_total_gain_eNB_dB - dB_fixed(frame_parms->N_RB_UL);
}
}
}
void lte_eNB_srs_measurements(PHY_VARS_eNB *phy_vars_eNb,
unsigned char eNB_id,
unsigned char UE_id,
unsigned char init_averaging)
{
LTE_DL_FRAME_PARMS *frame_parms = &phy_vars_eNb->lte_frame_parms;
PHY_MEASUREMENTS_eNB *phy_measurements = &phy_vars_eNb->PHY_measurements_eNB[eNB_id];
LTE_eNB_SRS *eNB_srs_vars = &phy_vars_eNb->lte_eNB_srs_vars[UE_id];
int32_t aarx,rx_power_correction;
int32_t rx_power;
uint32_t rb;
int32_t *ul_ch;
//printf("Running eNB_srs_measurements for eNB_id %d\n",eNB_id);
if (init_averaging == 1)
rx_power_avg_eNB[eNB_id][UE_id] = 0;
rx_power = 0;
if ( (frame_parms->ofdm_symbol_size == 128) ||
(frame_parms->ofdm_symbol_size == 512) )
rx_power_correction = 2;
else
rx_power_correction = 1;
for (aarx=0; aarx<frame_parms->nb_antennas_rx; aarx++) {
phy_measurements->rx_spatial_power[UE_id][0][aarx] =
((signal_energy_nodc(&eNB_srs_vars->srs_ch_estimates[eNB_id][aarx][frame_parms->first_carrier_offset],
(frame_parms->N_RB_DL*6)) +
signal_energy_nodc(&eNB_srs_vars->srs_ch_estimates[eNB_id][aarx][1],
(frame_parms->N_RB_DL*6)))*rx_power_correction) -
phy_measurements->n0_power[aarx];
phy_measurements->rx_spatial_power[UE_id][0][aarx]<<=1; // because of noise only in odd samples
phy_measurements->rx_spatial_power_dB[UE_id][0][aarx] = (unsigned short) dB_fixed(phy_measurements->rx_spatial_power[UE_id][0][aarx]);
phy_measurements->wideband_cqi[UE_id][aarx] = phy_measurements->rx_spatial_power[UE_id][0][aarx];
// phy_measurements->rx_power[UE_id][aarx]/=frame_parms->nb_antennas_tx;
phy_measurements->wideband_cqi_dB[UE_id][aarx] = (unsigned short) dB_fixed(phy_measurements->wideband_cqi[UE_id][aarx]);
rx_power += phy_measurements->wideband_cqi[UE_id][aarx];
// phy_measurements->rx_avg_power_dB[UE_id] += phy_measurements->rx_power_dB[UE_id][aarx];
}
// phy_measurements->rx_avg_power_dB[UE_id]/=frame_parms->nb_antennas_rx;
if (init_averaging == 0)
rx_power_avg_eNB[UE_id][eNB_id] = ((k1*rx_power_avg_eNB[UE_id][eNB_id]) + (k2*rx_power))>>10;
else
rx_power_avg_eNB[UE_id][eNB_id] = rx_power;
phy_measurements->wideband_cqi_tot[UE_id] = dB_fixed2(rx_power,2*phy_measurements->n0_power_tot);
// times 2 since we have noise only in the odd carriers of the srs comb
phy_measurements->rx_rssi_dBm[UE_id] = (int32_t)dB_fixed(rx_power_avg_eNB[UE_id][eNB_id])-phy_vars_eNb->rx_total_gain_eNB_dB;
for (aarx=0; aarx<frame_parms->nb_antennas_rx; aarx++) {
for (rb=0; rb<frame_parms->N_RB_DL; rb++) {
// printf("eNB_common_vars->srs_ch_estimates[0] => %x\n",eNB_common_vars->srs_ch_estimates[0]);
if (rb < 12)
ul_ch = &eNB_srs_vars->srs_ch_estimates[eNB_id][aarx][frame_parms->first_carrier_offset + (rb*12)];
else if (rb>12)
ul_ch = &eNB_srs_vars->srs_ch_estimates[eNB_id][aarx][6 + (rb-13)*12];
else {
phy_measurements->subband_cqi_dB[UE_id][aarx][rb] = 0;
continue;
}
// cqi
if (aarx==0)
phy_measurements->subband_cqi_tot[UE_id][rb]=0;
phy_measurements->subband_cqi[UE_id][aarx][rb] = (signal_energy_nodc(ul_ch,12))*rx_power_correction - phy_measurements->n0_power[aarx];
if (phy_measurements->subband_cqi[UE_id][aarx][rb] < 0)
phy_measurements->subband_cqi[UE_id][aarx][rb]=0;
phy_measurements->subband_cqi_tot[UE_id][rb] += phy_measurements->subband_cqi[UE_id][aarx][rb];
phy_measurements->subband_cqi_dB[UE_id][aarx][rb] = dB_fixed2(phy_measurements->subband_cqi[UE_id][aarx][rb],
2*phy_measurements->n0_power[aarx]);
// 2*n0_power since we have noise from the odd carriers in the comb of the srs
// msg("subband_cqi[%d][%d][%d] => %d (%d dB)\n",eNB_id,aarx,rb,phy_measurements->subband_cqi[eNB_id][aarx][rb],phy_measurements->subband_cqi_dB[eNB_id][aarx][rb]);
}
}
for (rb=0; rb<frame_parms->N_RB_DL; rb++) {
phy_measurements->subband_cqi_tot_dB[UE_id][rb] = dB_fixed2(phy_measurements->subband_cqi_tot[UE_id][rb],
phy_measurements->n0_power_tot);
/*
if (phy_measurements->subband_cqi_tot_dB[UE_id][rb] == 65)
msg("eNB meas error *****subband_cqi_tot[%d][%d] %d => %d dB (n0 %d)\n",UE_id,rb,phy_measurements->subband_cqi_tot[UE_id][rb],phy_measurements->subband_cqi_tot_dB[UE_id][rb],phy_measurements->n0_power_tot);
*/
}
}
void lte_eNB_I0_measurements_emul(PHY_VARS_eNB *phy_vars_eNb,
uint8_t sect_id)
{
LOG_D(PHY,"EMUL lte_eNB_IO_measurements_emul: eNB %d, sect %d\n",phy_vars_eNb->Mod_id,sect_id);
}