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srsRAN_4G
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Neighbour cell RSRP measurement always and only with correlation method

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master
Ismael Gomez 7 years ago
parent c815051238
commit c0aea5ae13
3 changed files with 17 additions and 45 deletions
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4
lib/src/phy/ch_estimation/chest_dl.c
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@ -734,7 +734,7 @@ float srslte_chest_dl_get_rsrp_neighbour_port(srslte_chest_dl_t *q, uint32_t por
}
float srslte_chest_dl_get_rsrp(srslte_chest_dl_t *q) {
float max = -0.0f;
float max = -1e9;
for (int i = 0; i < q->last_nof_antennas; ++i) {
float v = srslte_chest_dl_get_rsrp_port(q, i);
if (v > max) {
@ -745,7 +745,7 @@ float srslte_chest_dl_get_rsrp(srslte_chest_dl_t *q) {
}
float srslte_chest_dl_get_rsrp_neighbour(srslte_chest_dl_t *q) {
float max = -0.0f;
float max = -1e9;
for (int i = 0; i < q->last_nof_antennas; ++i) {
float v = srslte_chest_dl_get_rsrp_neighbour_port(q, i);
if (v > max) {

6
srsue/hdr/phy/phch_recv.h
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@ -171,7 +171,6 @@ private:
ret_code run_multiple_subframes(cf_t *buffer, int offset, uint32_t sf_idx, uint32_t nof_sf);
float rssi();
float rsrp();
float rsrp_n();
float rsrq();
float snr();
uint32_t frame_st_idx();
@ -184,7 +183,7 @@ private:
uint32_t nof_subframes;
uint32_t current_prb;
float rx_gain_offset;
float mean_rsrp, mean_rsrp_n, mean_rsrq, mean_snr, mean_rssi;
float mean_rsrp, mean_rsrq, mean_snr, mean_rssi;
uint32_t final_offset;
const static int RSRP_MEASURE_NOF_FRAMES = 5;
};
@ -205,7 +204,6 @@ private:
int find_cells(cf_t *input_buffer, float rx_gain_offset, srslte_cell_t current_cell, uint32_t nof_sf, cell_info_t found_cells[MAX_CELLS]);
private:
cf_t *input_cfo_corrected;
cf_t *sf_buffer[SRSLTE_MAX_PORTS];
srslte::log *log_h;
srslte_sync_t sync_find;
@ -233,7 +231,7 @@ private:
void write(uint32_t tti, cf_t *data, uint32_t nsamples);
private:
void run_thread();
const static int INTRA_FREQ_MEAS_LEN_MS = 50;
const static int INTRA_FREQ_MEAS_LEN_MS = 20;
const static int INTRA_FREQ_MEAS_PERIOD_MS = 200;
const static int INTRA_FREQ_MEAS_PRIO = DEFAULT_PRIORITY + 5;

52
srsue/src/phy/phch_recv.cc
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@ -1055,10 +1055,6 @@ float phch_recv::measure::rsrp() {
return 10*log10(mean_rsrp) + 30 - rx_gain_offset;
}
float phch_recv::measure::rsrp_n() {
return 10*log10(mean_rsrp_n) + 30 - rx_gain_offset;
}
float phch_recv::measure::rsrq() {
return 10*log10(mean_rsrq);
}
@ -1169,21 +1165,18 @@ phch_recv::measure::ret_code phch_recv::measure::run_subframe(uint32_t sf_idx)
return ERROR;
}
float rsrp = srslte_chest_dl_get_rsrp(&ue_dl.chest);
float rsrp_n = srslte_chest_dl_get_rsrp_neighbour(&ue_dl.chest);
float rsrp = srslte_chest_dl_get_rsrp_neighbour(&ue_dl.chest);
float rsrq = srslte_chest_dl_get_rsrq(&ue_dl.chest);
float snr = srslte_chest_dl_get_snr(&ue_dl.chest);
float rssi = srslte_vec_avg_power_cf(buffer[0], SRSLTE_SF_LEN_PRB(current_prb));
if (cnt == 0) {
mean_rsrp = rsrp;
mean_rsrp_n = rsrp_n;
mean_rsrq = rsrq;
mean_snr = snr;
mean_rssi = rssi;
} else {
mean_rsrp = SRSLTE_VEC_CMA(rsrp, mean_rsrp, cnt);
mean_rsrp_n = SRSLTE_VEC_CMA(rsrp_n, mean_rsrp_n, cnt);
mean_rsrq = SRSLTE_VEC_CMA(rsrq, mean_rsrq, cnt);
mean_snr = SRSLTE_VEC_CMA(snr, mean_snr, cnt);
mean_rssi = SRSLTE_VEC_CMA(rssi, mean_rssi, cnt);
@ -1191,7 +1184,7 @@ phch_recv::measure::ret_code phch_recv::measure::run_subframe(uint32_t sf_idx)
cnt++;
log_h->debug("SYNC: Measuring RSRP %d/%d, sf_idx=%d, RSRP=%.1f dBm, corr-RSRP=%.1f dBm, SNR=%.1f dB\n",
cnt, nof_subframes, sf_idx, rsrp, rsrp_n, snr);
cnt, nof_subframes, sf_idx, rsrp, snr);
if (cnt >= nof_subframes) {
return MEASURE_OK;
@ -1220,7 +1213,6 @@ void phch_recv::scell_recv::init(srslte::log *log_h, bool sic_pss_enabled, uint3
uint32_t max_sf_size = SRSLTE_SF_LEN(max_fft_sz);
sf_buffer[0] = (cf_t*) srslte_vec_malloc(sizeof(cf_t)*max_sf_size);
input_cfo_corrected = (cf_t*) srslte_vec_malloc(sizeof(cf_t)*15*max_sf_size);
measure_p.init(sf_buffer, log_h, 1, max_sf_window);
@ -1257,7 +1249,6 @@ void phch_recv::scell_recv::reset()
void phch_recv::scell_recv::deinit()
{
srslte_sync_free(&sync_find);
free(input_cfo_corrected);
free(sf_buffer[0]);
}
@ -1335,40 +1326,23 @@ int phch_recv::scell_recv::find_cells(cf_t *input_buffer, float rx_gain_offset,
found_cell.nof_ports = 1; // Use port 0 only for measurement
measure_p.set_cell(found_cell);
// Correct CFO
/*
srslte_cfo_correct(&sync_find.cfo_corr_frame,
input_buffer,
input_cfo_corrected,
-srslte_sync_get_cfo(&sync_find)/sync_find.fft_size);
*/
switch(measure_p.run_multiple_subframes(input_buffer, peak_idx, sf_idx, nof_sf))
{
case measure::MEASURE_OK:
// Consider a cell to be detectable 8.1.2.2.1.1 from 36.133. Currently only using first condition
if (measure_p.rsrp() > ABSOLUTE_RSRP_THRESHOLD_DBM) {
// Check the cell id has been correctly identified by using the correlation of the RS sequences
// By experimentation, typically the cross-correlation is ~3/4 dB less
if (measure_p.rsrp_n() > measure_p.rsrp() - 6) {
cells[nof_cells].pci = found_cell.id;
cells[nof_cells].rsrp = measure_p.rsrp();
cells[nof_cells].rsrq = measure_p.rsrq();
cells[nof_cells].offset = measure_p.frame_st_idx();
Info(
"INTRA: Found neighbour cell %d: PCI=%03d, RSRP=%5.1f dBm, corr-RSRP=%5.1f dBm, peak_idx=%5d, peak_value=%3.2f, sf=%d, max_sf=%d, n_id_2=%d, CFO=%6.1f Hz\n",
nof_cells, cell_id, measure_p.rsrp(), measure_p.rsrp_n(), measure_p.frame_st_idx(), sync_find.peak_value,
sf_idx, max_sf5, n_id_2, 15000 * srslte_sync_get_cfo(&sync_find));
nof_cells++;
} else {
Info(
"INTRA: Found phantom cell %d: PCI=%03d, RSRP=%5.1f dBm, corr-RSRP=%5.1f dBm, peak_idx=%5d, peak_value=%3.2f, sf=%d, max_sf=%d, n_id_2=%d, CFO=%6.1f Hz\n",
nof_cells, cell_id, measure_p.rsrp(), measure_p.rsrp_n(), measure_p.frame_st_idx(), sync_find.peak_value,
sf_idx, max_sf5, n_id_2, 15000 * srslte_sync_get_cfo(&sync_find));
}
cells[nof_cells].pci = found_cell.id;
cells[nof_cells].rsrp = measure_p.rsrp();
cells[nof_cells].rsrq = measure_p.rsrq();
cells[nof_cells].offset = measure_p.frame_st_idx();
Info(
"INTRA: Found neighbour cell %d: PCI=%03d, RSRP=%5.1f dBm, peak_idx=%5d, peak_value=%3.2f, sf=%d, nof_sf=%d, n_id_2=%d, CFO=%6.1f Hz\n",
nof_cells, cell_id, measure_p.rsrp(), measure_p.frame_st_idx(), sync_find.peak_value,
sf_idx, nof_sf, n_id_2, 15000 * srslte_sync_get_cfo(&sync_find));
nof_cells++;
/*
if (sic_pss_enabled) {

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