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144 lines
4.2 KiB
C
144 lines
4.2 KiB
C
/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2014 The libLTE Developers. See the
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* COPYRIGHT file at the top-level directory of this distribution.
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*
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* \section LICENSE
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*
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* This file is part of the libLTE library.
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*
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* libLTE is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation, either version 3 of
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* the License, or (at your option) any later version.
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*
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* libLTE is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* A copy of the GNU Lesser General Public License can be found in
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* the LICENSE file in the top-level directory of this distribution
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* and at http://www.gnu.org/licenses/.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <strings.h>
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#include <unistd.h>
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#include <math.h>
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#include <sys/time.h>
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#include <unistd.h>
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#include <assert.h>
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#include <signal.h>
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#include "liblte/rrc/rrc.h"
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#include "liblte/phy/phy.h"
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#include "liblte/cuhd/cuhd.h"
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#include "cell_scanner.h"
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/**********************************************************************
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* Program arguments processing
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***********************************************************************/
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typedef struct {
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int nof_subframes;
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int force_N_id_2;
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char *uhd_args;
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float uhd_freq;
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}prog_args_t;
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void args_default(prog_args_t *args) {
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args->nof_subframes = -1;
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args->force_N_id_2 = -1; // Pick the best
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args->uhd_args = "";
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args->uhd_freq = -1.0;
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}
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void usage(prog_args_t *args, char *prog) {
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printf("Usage: %s [alnv] -f rx_frequency (in Hz)\n", prog);
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printf("\t-a UHD args [Default %s]\n", args->uhd_args);
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printf("\t-l Force N_id_2 [Default best]\n");
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printf("\t-n nof_subframes [Default %d]\n", args->nof_subframes);
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printf("\t-v [set verbose to debug, default none]\n");
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}
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void parse_args(prog_args_t *args, int argc, char **argv) {
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int opt;
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args_default(args);
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while ((opt = getopt(argc, argv, "alnvf")) != -1) {
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switch (opt) {
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case 'a':
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args->uhd_args = argv[optind];
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break;
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case 'f':
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args->uhd_freq = atof(argv[optind]);
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break;
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case 'n':
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args->nof_subframes = atoi(argv[optind]);
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break;
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case 'l':
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args->force_N_id_2 = atoi(argv[optind]);
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break;
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case 'v':
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verbose++;
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break;
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default:
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usage(args, argv[0]);
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exit(-1);
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}
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}
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if (args->uhd_freq < 0) {
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usage(args, argv[0]);
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exit(-1);
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}
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}
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/**********************************************************************/
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int main(int argc, char **argv) {
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prog_args_t prog_args;
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cell_scanner_result_t result;
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cell_scanner_config_t cfg;
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cell_scanner_t cs;
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parse_args(&prog_args, argc, argv);
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// Peak-to-sidelobe ratio (PSR) threshold for cell detection early stopping.
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cfg.cell_detect_early_stop_threshold = 20.0; // This is a normal value.
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// maximum 5 ms frames that will be scanned maximum in the case the threshold is not exceed
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// ie for bad cells
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cfg.pss_max_frames = 50; // this is 250 ms
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// maximum 5 ms frames that will be received to decode the PBCH
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// ie for bad cells
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cfg.pbch_max_frames = 500; // this is 2500 ms
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// Number of 1 ms subframes that will be used to compute rsrp, rsrq, snr, etc average
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cfg.measure_avg_nof_frames = 1000; // 1 sec
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cfg.uhd_args = prog_args.uhd_args;
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// Init USRP
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if (cell_scanner_init(&cs, &cfg)) {
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fprintf(stderr, "Error initiating cell scanner\n");
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exit(-1);
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}
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// Scan for a frequency
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if (prog_args.force_N_id_2 < 0) {
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// We have 2 options, either we scan for the three possible N_id_2 root sequences...
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cell_scanner_all_cells(&cs, prog_args.uhd_freq, &result);
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} else {
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// or we scan for a single one.
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cell_scanner_cell(&cs, prog_args.uhd_freq, prog_args.force_N_id_2, &result);
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}
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printf("\nResult: CellID: %d, PHYID: %d, RSRP: %.1f dBm, RSRQ: %.1f dB, SNR: %.1f dB\n",
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result.cell_id, result.phy_cell.id,
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10*log10(result.rsrp*1000), 10*log10(result.rsrq), 10*log10(result.snr));
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}
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