srsLTE/lib/examples/cell_search.c

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/*
* Copyright 2013-2019 Software Radio Systems Limited
*
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* This file is part of srsLTE.
*
* srsLTE is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version.
*
* srsLTE 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
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* GNU Affero General Public License for more details.
*
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* A copy of the GNU Affero General Public License can be found in
* the LICENSE file in the top-level directory of this distribution
* and at http://www.gnu.org/licenses/.
*
*/
#include <math.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <sys/time.h>
#include <unistd.h>
#include <unistd.h>
#include "srslte/srslte.h"
#include "srslte/common/crash_handler.h"
#include "srslte/phy/rf/rf_utils.h"
#ifndef DISABLE_RF
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#include "srslte/phy/rf/rf.h"
#endif
#define MHZ 1000000
#define SAMP_FREQ 1920000
#define FLEN 9600
#define FLEN_PERIOD 0.005
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#define MAX_EARFCN 1000
int band = -1;
int earfcn_start = -1, earfcn_end = -1;
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cell_search_cfg_t cell_detect_config = {.max_frames_pbch = SRSLTE_DEFAULT_MAX_FRAMES_PBCH,
.max_frames_pss = SRSLTE_DEFAULT_MAX_FRAMES_PSS,
.nof_valid_pss_frames = SRSLTE_DEFAULT_NOF_VALID_PSS_FRAMES,
.init_agc = 0,
.force_tdd = false};
struct cells {
srslte_cell_t cell;
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float freq;
int dl_earfcn;
float power;
};
struct cells results[1024];
float rf_gain = 70.0;
char* rf_args = "";
void usage(char* prog)
{
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printf("Usage: %s [agsendtvb] -b band\n", prog);
printf("\t-a RF args [Default %s]\n", rf_args);
printf("\t-g RF gain [Default %.2f dB]\n", rf_gain);
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printf("\t-s earfcn_start [Default All]\n");
printf("\t-e earfcn_end [Default All]\n");
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printf("\t-n nof_frames_total [Default 100]\n");
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printf("\t-v [set srslte_verbose to debug, default none]\n");
}
void parse_args(int argc, char** argv)
{
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int opt;
while ((opt = getopt(argc, argv, "agsendvb")) != -1) {
switch (opt) {
case 'a':
rf_args = argv[optind];
break;
case 'b':
band = (int)strtol(argv[optind], NULL, 10);
break;
case 's':
earfcn_start = (int)strtol(argv[optind], NULL, 10);
break;
case 'e':
earfcn_end = (int)strtol(argv[optind], NULL, 10);
break;
case 'n':
cell_detect_config.max_frames_pss = (uint32_t)strtol(argv[optind], NULL, 10);
break;
case 'g':
rf_gain = strtof(argv[optind], NULL);
break;
case 'v':
srslte_verbose++;
break;
default:
usage(argv[0]);
exit(-1);
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}
}
if (band == -1) {
usage(argv[0]);
exit(-1);
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}
}
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int srslte_rf_recv_wrapper(void* h, void* data, uint32_t nsamples, srslte_timestamp_t* t)
{
DEBUG(" ---- Receive %d samples ---- \n", nsamples);
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return srslte_rf_recv_with_time((srslte_rf_t*)h, data, nsamples, 1, NULL, NULL);
}
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bool go_exit = false;
void sig_int_handler(int signo)
{
printf("SIGINT received. Exiting...\n");
if (signo == SIGINT) {
go_exit = true;
}
}
static SRSLTE_AGC_CALLBACK(srslte_rf_set_rx_gain_wrapper)
{
srslte_rf_set_rx_gain((srslte_rf_t*)h, gain_db);
}
int main(int argc, char** argv)
{
int n;
srslte_rf_t rf;
srslte_ue_cellsearch_t cs;
srslte_ue_cellsearch_result_t found_cells[3];
int nof_freqs;
srslte_earfcn_t channels[MAX_EARFCN];
uint32_t freq;
uint32_t n_found_cells = 0;
srslte_debug_handle_crash(argc, argv);
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parse_args(argc, argv);
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printf("Opening RF device...\n");
if (srslte_rf_open(&rf, rf_args)) {
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ERROR("Error opening rf\n");
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exit(-1);
}
if (!cell_detect_config.init_agc) {
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srslte_rf_set_rx_gain(&rf, rf_gain);
} else {
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printf("Starting AGC thread...\n");
if (srslte_rf_start_gain_thread(&rf, false)) {
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ERROR("Error opening rf\n");
exit(-1);
}
srslte_rf_set_rx_gain(&rf, 50);
}
// Supress RF messages
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srslte_rf_suppress_stdout(&rf);
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nof_freqs = srslte_band_get_fd_band(band, channels, earfcn_start, earfcn_end, MAX_EARFCN);
if (nof_freqs < 0) {
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ERROR("Error getting EARFCN list\n");
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exit(-1);
}
sigset_t sigset;
sigemptyset(&sigset);
sigaddset(&sigset, SIGINT);
sigprocmask(SIG_UNBLOCK, &sigset, NULL);
signal(SIGINT, sig_int_handler);
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if (srslte_ue_cellsearch_init(&cs, cell_detect_config.max_frames_pss, srslte_rf_recv_wrapper, (void*)&rf)) {
ERROR("Error initiating UE cell detect\n");
exit(-1);
}
if (cell_detect_config.max_frames_pss) {
srslte_ue_cellsearch_set_nof_valid_frames(&cs, cell_detect_config.nof_valid_pss_frames);
}
if (cell_detect_config.init_agc) {
srslte_rf_info_t* rf_info = srslte_rf_get_info(&rf);
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srslte_ue_sync_start_agc(&cs.ue_sync,
srslte_rf_set_rx_gain_wrapper,
rf_info->min_rx_gain,
rf_info->max_rx_gain,
cell_detect_config.init_agc);
}
for (freq = 0; freq < nof_freqs && !go_exit; freq++) {
/* set rf_freq */
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srslte_rf_set_rx_freq(&rf, 0, (double)channels[freq].fd * MHZ);
INFO("Set rf_freq to %.3f MHz\n", (double)channels[freq].fd * MHZ / 1000000);
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printf(
"[%3d/%d]: EARFCN %d Freq. %.2f MHz looking for PSS.\n", freq, nof_freqs, channels[freq].id, channels[freq].fd);
fflush(stdout);
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if (SRSLTE_VERBOSE_ISINFO()) {
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printf("\n");
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}
bzero(found_cells, 3 * sizeof(srslte_ue_cellsearch_result_t));
INFO("Setting sampling frequency %.2f MHz for PSS search\n", SRSLTE_CS_SAMP_FREQ / 1000000);
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srslte_rf_set_rx_srate(&rf, SRSLTE_CS_SAMP_FREQ);
INFO("Starting receiver...\n");
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srslte_rf_start_rx_stream(&rf, false);
n = srslte_ue_cellsearch_scan(&cs, found_cells, NULL);
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if (n < 0) {
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ERROR("Error searching cell\n");
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exit(-1);
} else if (n > 0) {
for (int i = 0; i < 3; i++) {
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if (found_cells[i].psr > 2.0) {
srslte_cell_t cell;
cell.id = found_cells[i].cell_id;
cell.cp = found_cells[i].cp;
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int ret = rf_mib_decoder(&rf, 1, &cell_detect_config, &cell, NULL);
if (ret < 0) {
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ERROR("Error decoding MIB\n");
exit(-1);
}
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if (ret == SRSLTE_UE_MIB_FOUND) {
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printf("Found CELL ID %d. %d PRB, %d ports\n", cell.id, cell.nof_prb, cell.nof_ports);
if (cell.nof_ports > 0) {
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results[n_found_cells].cell = cell;
results[n_found_cells].freq = channels[freq].fd;
results[n_found_cells].dl_earfcn = channels[freq].id;
results[n_found_cells].power = found_cells[i].peak;
n_found_cells++;
}
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}
}
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}
}
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}
printf("\n\nFound %d cells\n", n_found_cells);
for (int i = 0; i < n_found_cells; i++) {
printf("Found CELL %.1f MHz, EARFCN=%d, PHYID=%d, %d PRB, %d ports, PSS power=%.1f dBm\n",
results[i].freq,
results[i].dl_earfcn,
results[i].cell.id,
results[i].cell.nof_prb,
results[i].cell.nof_ports,
srslte_convert_power_to_dB(results[i].power));
}
printf("\nBye\n");
srslte_ue_cellsearch_free(&cs);
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srslte_rf_close(&rf);
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exit(0);
}