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Get CRS-based RSRP estimate for in/out-sync measurement. New SNR estimation gives 0 SNR when cell signal is lost preventing from detecting out-of-sync

This commit is contained in:
Ismael Gomez 2018-04-24 10:18:13 +02:00
parent 7146819fcd
commit 9c7b3339be
3 changed files with 58 additions and 33 deletions
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6
srsue/hdr/phy/phch_common.h
View File

@ -68,15 +68,17 @@ public:
float cur_radio_power;
float cur_pusch_power;
float avg_rsrp;
float avg_rsrp_cqi;
float avg_rsrp_dbm;
float avg_rsrp_sync_dbm;
float avg_rsrq_db;
float avg_rssi_dbm;
float last_radio_rssi;
float rx_gain_offset;
float avg_snr_db;
float avg_snr_db_cqi;
float avg_snr_db_sync;
float avg_noise;
bool pcell_first_measurement;
uint32_t pcell_report_period;
// Save last TBS for mcs>28 cases

3
srsue/src/phy/phch_common.cc
View File

@ -342,7 +342,10 @@ void phch_common::reset() {
cur_radio_power = 0;
sr_last_tx_tti = -1;
cur_pusch_power = 0;
avg_snr_db_cqi = 0;
avg_snr_db_sync = 0;
avg_rsrp = 0;
avg_rsrp_cqi = 0;
avg_rsrp_dbm = 0;
avg_rsrq_db = 0;

82
srsue/src/phy/phch_worker.cc
View File

@ -133,6 +133,7 @@ bool phch_worker::init(uint32_t max_prb, srslte::log *log_h, srslte::log *log_ph
return false;
}
srslte_chest_dl_set_rsrp_neighbour(&ue_dl.chest, true);
srslte_chest_dl_average_subframe(&ue_dl.chest, phy->args->average_subframe_enabled);
srslte_chest_dl_cfo_estimate_enable(&ue_dl.chest, phy->args->cfo_ref_mask!=0, phy->args->cfo_ref_mask);
srslte_ue_ul_set_normalization(&ue_ul, true);
@ -164,8 +165,6 @@ bool phch_worker::set_cell(srslte_cell_t cell_)
srslte_ue_ul_set_normalization(&ue_ul, true);
srslte_ue_ul_set_cfo_enable(&ue_ul, true);
phy->pcell_first_measurement = true;
cell_initiated = true;
}
ret = true;
@ -393,13 +392,13 @@ void phch_worker::work_imp()
update_measurements();
if (chest_ok) {
if (phy->avg_rsrp_dbm > -130.0 && phy->avg_snr_db > -10.0) {
log_h->debug("SNR=%.1f dB, RSRP=%.1f dBm sync=in-sync from channel estimator\n",
phy->avg_snr_db, phy->avg_rsrp_dbm);
if (phy->avg_rsrp_sync_dbm > -130.0 && phy->avg_snr_db_sync > -10.0) {
log_h->info("SNR=%.1f dB, RSRP=%.1f dBm sync=in-sync from channel estimator\n",
phy->avg_snr_db_sync, phy->avg_rsrp_sync_dbm);
chest_loop->in_sync();
} else {
log_h->warning("SNR=%.1f dB RSRP=%.1f dBm, sync=out-of-sync from channel estimator\n",
phy->avg_snr_db, phy->avg_rsrp_dbm);
log_h->info("SNR=%.1f dB RSRP=%.1f dBm, sync=out-of-sync from channel estimator\n",
phy->avg_snr_db_sync, phy->avg_rsrp_sync_dbm);
chest_loop->out_of_sync();
}
}
@ -914,16 +913,16 @@ void phch_worker::set_uci_periodic_cqi()
if (period_cqi.format_is_subband) {
// TODO: Implement subband periodic reports
cqi_report.type = SRSLTE_CQI_TYPE_SUBBAND;
cqi_report.subband.subband_cqi = srslte_cqi_from_snr(phy->avg_snr_db);
cqi_report.subband.subband_cqi = srslte_cqi_from_snr(phy->avg_snr_db_cqi);
cqi_report.subband.subband_label = 0;
log_h->console("Warning: Subband CQI periodic reports not implemented\n");
Debug("PUCCH: Periodic CQI=%d, SNR=%.1f dB\n", cqi_report.subband.subband_cqi, phy->avg_snr_db);
Debug("PUCCH: Periodic CQI=%d, SNR=%.1f dB\n", cqi_report.subband.subband_cqi, phy->avg_snr_db_cqi);
} else {
cqi_report.type = SRSLTE_CQI_TYPE_WIDEBAND;
if (cqi_fixed >= 0) {
cqi_report.wideband.wideband_cqi = cqi_fixed;
} else {
cqi_report.wideband.wideband_cqi = srslte_cqi_from_snr(phy->avg_snr_db);
cqi_report.wideband.wideband_cqi = srslte_cqi_from_snr(phy->avg_snr_db_cqi);
}
if (cqi_max >= 0 && cqi_report.wideband.wideband_cqi > cqi_max) {
cqi_report.wideband.wideband_cqi = cqi_max;
@ -933,7 +932,7 @@ void phch_worker::set_uci_periodic_cqi()
cqi_report.wideband.pmi = phy->last_pmi;
cqi_report.wideband.rank_is_not_one = (phy->last_ri != 0);
}
Debug("PUCCH: Periodic CQI=%d, SNR=%.1f dB\n", cqi_report.wideband.wideband_cqi, phy->avg_snr_db);
Debug("PUCCH: Periodic CQI=%d, SNR=%.1f dB\n", cqi_report.wideband.wideband_cqi, phy->avg_snr_db_cqi);
}
uci_data.uci_cqi_len = (uint32_t) srslte_cqi_value_pack(&cqi_report, uci_data.uci_cqi);
rar_cqi_request = false;
@ -963,7 +962,7 @@ void phch_worker::set_uci_aperiodic_cqi()
if (rnti_is_set) {
srslte_cqi_value_t cqi_report = {0};
cqi_report.type = SRSLTE_CQI_TYPE_SUBBAND_HL;
cqi_report.subband_hl.wideband_cqi_cw0 = srslte_cqi_from_snr(phy->avg_snr_db);
cqi_report.subband_hl.wideband_cqi_cw0 = srslte_cqi_from_snr(phy->avg_snr_db_cqi);
// TODO: implement subband CQI properly
cqi_report.subband_hl.subband_diff_cqi_cw0 = 0; // Always report zero offset on all subbands
@ -989,7 +988,7 @@ void phch_worker::set_uci_aperiodic_cqi()
}
Info("PUSCH: Aperiodic RM30 CQI=%s, %sSNR=%.1f dB, for %d subbands\n",
cqi_str, (uci_data.uci_ri_len)?((uci_data.uci_ri == 0)?"ri=0, ":"ri=1, "):"", phy->avg_snr_db, cqi_report.subband_hl.N);
cqi_str, (uci_data.uci_ri_len)?((uci_data.uci_ri == 0)?"ri=0, ":"ri=1, "):"", phy->avg_snr_db_cqi, cqi_report.subband_hl.N);
}
break;
case LIBLTE_RRC_CQI_REPORT_MODE_APERIODIC_RM31:
@ -1402,18 +1401,18 @@ void phch_worker::update_measurements()
}
}
// Average RSRQ
// Average RSRQ over DEFAULT_MEAS_PERIOD_MS then sent to RRC
float rsrq_db = 10*log10(srslte_chest_dl_get_rsrq(&ue_dl.chest));
if (isnormal(rsrq_db)) {
if (!phy->avg_rsrq_db) {
phy->avg_rsrq_db = SRSLTE_VEC_EMA(rsrq_db, phy->avg_rsrq_db, snr_ema_coeff);
} else {
if (!(tti%phy->pcell_report_period) || !phy->avg_rsrq_db) {
phy->avg_rsrq_db = rsrq_db;
} else {
phy->avg_rsrq_db = SRSLTE_VEC_CMA(rsrq_db, phy->avg_rsrq_db, tti%phy->pcell_report_period);
}
}
// Average RSRP
float rsrp_lin = srslte_chest_dl_get_rsrp(&ue_dl.chest);
// Average RSRP taken from CRS
float rsrp_lin = srslte_chest_dl_get_rsrp_neighbour(&ue_dl.chest);
if (isnormal(rsrp_lin)) {
if (!phy->avg_rsrp) {
phy->avg_rsrp = SRSLTE_VEC_EMA(rsrp_lin, phy->avg_rsrp, snr_ema_coeff);
@ -1425,19 +1424,20 @@ void phch_worker::update_measurements()
/* Correct absolute power measurements by RX gain offset */
float rsrp_dbm = 10*log10(rsrp_lin) + 30 - phy->rx_gain_offset;
// Serving cell measurements are averaged over DEFAULT_MEAS_PERIOD_MS then sent to RRC
// Serving cell RSRP measurements are averaged over DEFAULT_MEAS_PERIOD_MS then sent to RRC
if (isnormal(rsrp_dbm)) {
if (!phy->avg_rsrp_dbm) {
if (!(tti%phy->pcell_report_period) || !phy->avg_rsrp_dbm) {
phy->avg_rsrp_dbm = rsrp_dbm;
} else {
phy->avg_rsrp_dbm = SRSLTE_VEC_EMA(rsrp_dbm, phy->avg_rsrp_dbm, snr_ema_coeff);
}
if ((tti%phy->pcell_report_period) == 0 || phy->pcell_first_measurement) {
phy->pcell_first_measurement = false;
phy->rrc->new_phy_meas(phy->avg_rsrp_dbm, phy->avg_rsrq_db, tti);
phy->avg_rsrp_dbm = SRSLTE_VEC_CMA(rsrp_dbm, phy->avg_rsrp_dbm, tti%phy->pcell_report_period);
}
}
// Send PCell measurement
if ((tti%phy->pcell_report_period) == phy->pcell_report_period-1) {
phy->rrc->new_phy_meas(phy->avg_rsrp_dbm, phy->avg_rsrq_db, tti);
}
// Compute PL
float tx_crs_power = phy->config->common.pdsch_cnfg.rs_power;
phy->pathloss = tx_crs_power - phy->avg_rsrp_dbm;
@ -1451,17 +1451,37 @@ void phch_worker::update_measurements()
phy->avg_noise = SRSLTE_VEC_EMA(cur_noise, phy->avg_noise, snr_ema_coeff);
}
}
// Compute SNR
phy->avg_snr_db = 10*log10(phy->avg_rsrp/phy->avg_noise);
// To compute CQI use RSRP measurements from resource elements in RS since is more robust to time offset
float rsrp_lin_cqi = srslte_chest_dl_get_rsrp(&ue_dl.chest);
if (isnormal(rsrp_lin_cqi)) {
if (!phy->avg_rsrp_cqi) {
phy->avg_rsrp_cqi = SRSLTE_VEC_EMA(rsrp_lin_cqi, phy->avg_rsrp_cqi, snr_ema_coeff);
} else {
phy->avg_rsrp_cqi = rsrp_lin_cqi;
}
}
float rsrp_sync_dbm = 10*log10(rsrp_lin_cqi) + 30 - phy->rx_gain_offset;
if (isnormal(rsrp_sync_dbm)) {
if (!phy->avg_rsrp_sync_dbm) {
phy->avg_rsrp_sync_dbm = rsrp_sync_dbm;
} else {
phy->avg_rsrp_sync_dbm = SRSLTE_VEC_EMA(rsrp_sync_dbm, phy->avg_rsrp_sync_dbm, snr_ema_coeff);
}
}
// We compute 2 SNR metrics, 1 for deciding in-sync/out-of-sync and another for CQI measurements
phy->avg_snr_db_cqi = 10*log10(phy->avg_rsrp_cqi/phy->avg_noise); // this for CQI
phy->avg_snr_db_sync = 10*log10(phy->avg_rsrp/phy->avg_noise); // this for sync
// Store metrics
dl_metrics.n = phy->avg_noise;
dl_metrics.rsrp = phy->avg_rsrp_dbm;
dl_metrics.rsrq = phy->avg_rsrq_db;
dl_metrics.rssi = phy->avg_rssi_dbm;
dl_metrics.pathloss = phy->pathloss;
dl_metrics.sinr = phy->avg_snr_db;
dl_metrics.sinr = phy->avg_snr_db_cqi;
dl_metrics.turbo_iters = srslte_pdsch_last_noi(&ue_dl.pdsch);
phy->set_dl_metrics(dl_metrics);