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srsLTE/test/phy/nr_phy_test.cc

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/**
* Copyright 2013-2022 Software Radio Systems Limited
*
* This file is part of srsRAN.
*
* srsRAN is free software: you can redistribute it and/or modify
* 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.
*
* srsRAN 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
* GNU Affero General Public License for more details.
*
* 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 "dummy_gnb_stack.h"
#include "dummy_ue_stack.h"
#include "srsran/common/phy_cfg_nr_default.h"
#include "srsran/common/test_common.h"
#include "test_bench.h"
#include <boost/program_options.hpp>
#include <iostream>
// shorten boost program options namespace
namespace bpo = boost::program_options;
static double assert_sr_detection_min = 1.000;
static double assert_cqi_detection_min = 1.000;
static double assert_pusch_bler_max = 0.000;
static double assert_pdsch_bler_max = 0.000;
static double assert_prach_detection_min = 1.000;
static double assert_prach_ta_min = 0.000;
static double assert_prach_ta_max = 0.000;
static double assert_pucch_snr_min = 0.000;
test_bench::args_t::args_t(int argc, char** argv)
{
std::string config_file;
std::string reference_cfg_str;
bpo::options_description options;
bpo::options_description options_tb("Test bench options");
bpo::options_description options_gnb_stack("gNb stack and scheduling related options");
bpo::options_description options_gnb_phy("gNb PHY related options");
bpo::options_description options_ue_stack("UE stack options");
bpo::options_description options_ue_phy("UE PHY options");
bpo::options_description options_ue_rf("UE RF options");
bpo::options_description options_assertion("Test assertions");
bpo::options_description options_conf_file("Configuration file");
uint16_t rnti = 17921;
gnb_stack.pdsch.slots = "0,1,2,3,4,5";
gnb_stack.pusch.slots = "6,7,8,9";
// clang-format off
options_tb.add_options()
("rnti", bpo::value<uint16_t>(&rnti)->default_value(rnti), "UE RNTI")
("duration", bpo::value<uint64_t>(&durations_slots)->default_value(durations_slots), "Test duration in slots")
("lib.log.level", bpo::value<std::string>(&phy_lib_log_level)->default_value(phy_lib_log_level), "PHY library log level")
("reference", bpo::value<std::string>(&reference_cfg_str)->default_value(reference_cfg_str), "Reference PHY configuration arguments")
("dl_channel.awgn_enable", bpo::value<bool>(&dl_channel.awgn_enable)->default_value(dl_channel.awgn_enable), "DL Channel AWGN enable / disable")
("dl_channel.awgn_snr", bpo::value<float>(&dl_channel.awgn_snr_dB)->default_value(dl_channel.awgn_snr_dB), "DL Channel AWGN SNR in dB")
("ul_channel.awgn_enable", bpo::value<bool>(&ul_channel.awgn_enable)->default_value(ul_channel.awgn_enable), "UL Channel AWGN enable / disable")
("ul_channel.awgn_snr", bpo::value<float>(&ul_channel.awgn_snr_dB)->default_value(ul_channel.awgn_snr_dB), "UL Channel AWGN SNR in dB")
("ul_channel.signal_power_dBfs", bpo::value<float>(&ul_channel.awgn_signal_power_dBfs)->default_value(ul_channel.awgn_signal_power_dBfs), "UL Channel expected signal power")
("channel.cfo", bpo::value<float>(&ul_channel.hst_fd_hz)->default_value(0), "Channel HST Doppler frequency")
;
options_gnb_stack.add_options()
("gnb.stack.pdcch.aggregation_level", bpo::value<uint32_t>(&gnb_stack.pdcch_aggregation_level)->default_value(gnb_stack.pdcch_aggregation_level), "PDCCH aggregation level")
("gnb.stack.pdsch.candidate", bpo::value<uint32_t>(&gnb_stack.pdcch_dl_candidate)->default_value(gnb_stack.pdcch_dl_candidate), "PDCCH candidate index for PDSCH")
("gnb.stack.pdsch.start", bpo::value<uint32_t>(&gnb_stack.pdsch.rb_start)->default_value(0), "PDSCH scheduling frequency allocation start")
("gnb.stack.pdsch.length", bpo::value<uint32_t>(&gnb_stack.pdsch.rb_length)->default_value(gnb_stack.pdsch.rb_length), "PDSCH scheduling frequency allocation length")
("gnb.stack.pdsch.slots", bpo::value<std::string>(&gnb_stack.pdsch.slots)->default_value(gnb_stack.pdsch.slots), "Slots enabled for PDSCH")
("gnb.stack.pdsch.mcs", bpo::value<uint32_t>(&gnb_stack.pdsch.mcs)->default_value(gnb_stack.pdsch.mcs), "PDSCH scheduling modulation code scheme")
("gnb.stack.pusch.candidate", bpo::value<uint32_t>(&gnb_stack.pdcch_ul_candidate)->default_value(gnb_stack.pdcch_ul_candidate), "PDCCH candidate index for PUSCH")
("gnb.stack.pusch.start", bpo::value<uint32_t>(&gnb_stack.pusch.rb_start)->default_value(0), "PUSCH scheduling frequency allocation start")
("gnb.stack.pusch.length", bpo::value<uint32_t>(&gnb_stack.pusch.rb_length)->default_value(gnb_stack.pusch.rb_length), "PUSCH scheduling frequency allocation length")
("gnb.stack.pusch.slots", bpo::value<std::string>(&gnb_stack.pusch.slots)->default_value(gnb_stack.pusch.slots), "Slots enabled for PUSCH")
("gnb.stack.pusch.mcs", bpo::value<uint32_t>(&gnb_stack.pusch.mcs)->default_value(gnb_stack.pusch.mcs), "PUSCH scheduling modulation code scheme")
("gnb.stack.log.level", bpo::value<std::string>(&gnb_stack.log_level)->default_value(gnb_stack.log_level), "Stack log level")
("gnb.stack.use_dummy_mac", bpo::value<std::string>(&gnb_stack.use_dummy_mac)->default_value("dummymac"), "Use dummy or real NR scheduler (dummymac or realmac)")
;
options_gnb_phy.add_options()
("gnb.phy.nof_threads", bpo::value<uint32_t>(&gnb_phy.nof_phy_threads)->default_value(1), "Number of threads")
("gnb.phy.log.level", bpo::value<std::string>(&gnb_phy.log.phy_level)->default_value("warning"), "gNb PHY log level")
("gnb.phy.log.hex_limit", bpo::value<int>(&gnb_phy.log.phy_hex_limit)->default_value(0), "gNb PHY log hex limit")
("gnb.phy.log.id_preamble", bpo::value<std::string>(&gnb_phy.log.id_preamble)->default_value("GNB/"), "gNb PHY log ID preamble")
("gnb.phy.pusch.max_iter", bpo::value<uint32_t>(&gnb_phy.pusch_max_its)->default_value(10), "PUSCH LDPC max number of iterations")
;
options_ue_phy.add_options()
("ue.phy.fix_wideband_cqi", bpo::value<uint32_t>(&ue_phy.fix_wideband_cqi)->default_value(15), "Fix wideband CQI value, set to 0 or greater than 15 to disable")
("ue.phy.nof_threads", bpo::value<uint32_t>(&ue_phy.nof_phy_threads)->default_value(1), "Number of threads")
("ue.phy.log.level", bpo::value<std::string>(&ue_phy.log.phy_level)->default_value("warning"), "UE PHY log level")
("ue.phy.log.hex_limit", bpo::value<int>(&ue_phy.log.phy_hex_limit)->default_value(0), "UE PHY log hex limit")
("ue.phy.log.id_preamble", bpo::value<std::string>(&ue_phy.log.id_preamble)->default_value(" UE/"), "UE PHY log ID preamble")
;
options_ue_rf.add_options()
("ue.rf.log.level", bpo::value<std::string>(&ue_radio_log_level)->default_value("warning"), "UE RF log level")
;
options_ue_stack.add_options()
("ue.stack.sr.period", bpo::value<uint32_t>(&ue_stack.sr_period)->default_value(ue_stack.sr_period), "SR period in number of opportunities. Set 0 to disable and 1 for all.")
("ue.stack.prach.period", bpo::value<uint32_t>(&ue_stack.prach_period)->default_value(ue_stack.prach_period), "PRACH period in SFN. Set 0 to disable and 1 for all.")
;
options_assertion.add_options()
("assert.sr.detection.min", bpo::value<double>(&assert_sr_detection_min)->default_value(assert_sr_detection_min), "Scheduling request minimum detection threshold")
("assert.cqi.detection.min", bpo::value<double>(&assert_cqi_detection_min)->default_value(assert_cqi_detection_min), "CQI report minimum detection threshold")
("assert.pusch.bler.max", bpo::value<double>(&assert_pusch_bler_max)->default_value(assert_pusch_bler_max), "PUSCH maximum BLER threshold")
("assert.pdsch.bler.max", bpo::value<double>(&assert_pdsch_bler_max)->default_value(assert_pdsch_bler_max), "PDSCH maximum BLER threshold")
("assert.prach.ta.min", bpo::value<double>(&assert_prach_ta_min)->default_value(assert_prach_ta_min), "PRACH estimated TA minimum value threshold")
("assert.prach.ta.max", bpo::value<double>(&assert_prach_ta_max)->default_value(assert_prach_ta_max), "PRACH estimated TA maximum value threshold")
("assert.pucch.snr.min", bpo::value<double>(&assert_pucch_snr_min)->default_value(assert_pucch_snr_min), "PUCCH DMRS minimum SNR allowed threshold")
;
options_conf_file.add_options()
("config_file", bpo::value<std::string>(&config_file), "Configuration file")
;
bpo::positional_options_description p;
p.add("config_file", -1);
options.add(options_tb).add(options_assertion).add(options_gnb_stack).add(options_gnb_phy).add(options_ue_stack)
.add(options_ue_phy).add(options_ue_rf).add(options_conf_file).add_options()
("help", "Show this message")
;
// clang-format on
bpo::variables_map vm;
try {
bpo::store(bpo::command_line_parser(argc, argv).options(options).positional(p).run(), vm);
bpo::notify(vm);
// Apply the High Speed Train args to the DL channel as well
ul_channel.hst_enable = std::isnormal(ul_channel.hst_fd_hz);
dl_channel.hst_enable = ul_channel.hst_enable;
dl_channel.hst_fd_hz = ul_channel.hst_fd_hz;
} catch (bpo::error& e) {
std::cerr << e.what() << std::endl;
return;
}
// help option was given or error - print usage and exit
if (vm.count("help")) {
std::cout << "Usage: " << argv[0] << " [OPTIONS] config_file" << std::endl << std::endl;
std::cout << options_tb << std::endl << options_assertion << std::endl;
std::cout << options_gnb_phy << std::endl << options_gnb_stack << std::endl;
std::cout << options_ue_phy << std::endl << options_ue_stack << std::endl;
exit(0);
}
// if config file given
if (vm.count("config_file") != 0U) {
std::cout << "Reading configuration file " << config_file << "..." << std::endl;
std::ifstream conf(config_file.c_str(), std::ios::in);
if (conf.fail()) {
std::cout << "Failed to read configuration file " << config_file << " - exiting" << std::endl;
exit(1);
}
// parse config file and handle errors gracefully
try {
bpo::store(bpo::parse_config_file(conf, options), vm);
bpo::notify(vm);
} catch (const boost::program_options::error& e) {
std::cerr << e.what() << std::endl;
exit(1);
}
}
// Load default reference configuration
phy_cfg = srsran::phy_cfg_nr_default_t(srsran::phy_cfg_nr_default_t::reference_cfg_t(reference_cfg_str));
// Calculate the DL signal power from the number of PRBs
dl_channel.awgn_signal_power_dBfs = srsran_gnb_dl_get_maximum_signal_power_dBfs(phy_cfg.carrier.nof_prb);
// Reverses the Doppler shift for the UL
ul_channel.hst_init_time_s = 0.5 * dl_channel.hst_period_s;
// Calculate sampling rate in Hz
srate_hz = (double)(srsran_min_symbol_sz_rb(phy_cfg.carrier.nof_prb) * SRSRAN_SUBC_SPACING_NR(phy_cfg.carrier.scs));
ue_phy.srate_hz = srate_hz;
cell_list.resize(1);
cell_list[0].carrier = phy_cfg.carrier;
cell_list[0].rf_port = 0;
cell_list[0].cell_id = 0;
ue_stack.rnti = rnti;
gnb_stack.rnti = rnti;
gnb_stack.phy_cfg = phy_cfg;
gnb_stack.wait_preamble = ue_stack.prach_period > 0;
if (gnb_stack.pdsch.rb_length == 0) {
gnb_stack.pdsch.rb_length = phy_cfg.carrier.nof_prb;
gnb_stack.pdsch.rb_start = 0;
}
if (gnb_stack.pusch.rb_length == 0) {
gnb_stack.pusch.rb_length = phy_cfg.carrier.nof_prb;
gnb_stack.pdsch.rb_start = 0;
}
// Disable RT priority in the UE PHY
ue_phy.workers_thread_prio = -1;
ue_phy.slot_recv_thread_prio = -1;
// Flag configuration as valid
valid = true;
}
int main(int argc, char** argv)
{
srslog::init();
// Parse test bench arguments
test_bench::args_t args(argc, argv);
// Parse arguments
TESTASSERT(args.valid);
// Create test bench
test_bench tb(args);
// Assert bench is initialised correctly
TESTASSERT(tb.is_initialised());
// Start cell selection procedure
srsue::rrc_interface_phy_nr::cell_select_result_t cs_res =
tb.run_cell_select(args.phy_cfg.carrier, args.phy_cfg.get_ssb_cfg());
srsran_assert(cs_res.status == srsue::rrc_interface_phy_nr::cell_select_result_t::SUCCESSFUL,
"Failed to perform cell selection");
// Run per TTI basis
while (tb.run_tti()) {
; // Do nothing
}
// Stop test bench
tb.stop();
// Flush log
srslog::flush();
// Retrieve MAC metrics
test_bench::metrics_t metrics = tb.get_metrics();
// Print PRACH
double prach_detection = 0.0;
double prach_ta = 0.0;
uint32_t prach_tx_count = 0;
uint32_t prach_rx_count = 0;
if (metrics.ue_stack.prach.size() > 0) {
srsran::console("PRACH:\n");
srsran::console(
" +------------+------------+------------+------------+------------+------------+------------+\n");
srsran::console(" | %10s | %10s | %10s | %10s | %10s | %10s | %10s |\n",
"Preamble",
"Transmit'd",
"Received",
"Detection",
"Avg TA",
"Min TA",
"Max TA");
srsran::console(
" +------------+------------+------------+------------+------------+------------+------------+\n");
for (const auto& p : metrics.ue_stack.prach) {
// Ensure the detected count matches with transmission
// TESTASSERT(metrics.gnb_stack.prach.count(p.first));
// TESTASSERT(metrics.gnb_stack.prach[p.first].count == p.second.count);
TESTASSERT(p.second.count != 0);
prach_tx_count += p.second.count;
gnb_dummy_stack::prach_metrics_t gnb_prach = {};
if (metrics.gnb_stack.prach.count(p.first) > 0) {
gnb_prach = metrics.gnb_stack.prach[p.first];
prach_ta = SRSRAN_VEC_SAFE_CMA(gnb_prach.avg_ta, prach_ta, prach_rx_count);
} else {
gnb_prach.avg_ta = NAN;
gnb_prach.min_ta = NAN;
gnb_prach.max_ta = NAN;
}
prach_rx_count += gnb_prach.count;
double detection = (double)gnb_prach.count / (double)p.second.count;
srsran::console(" | %10d | %10d | %10d | %10.3f | %10.1f | %10.1f | %10.1f |\n",
p.first,
p.second.count,
gnb_prach.count,
detection,
gnb_prach.avg_ta,
gnb_prach.min_ta,
gnb_prach.max_ta);
}
srsran::console(
" +------------+------------+------------+------------+------------+------------+------------+\n");
}
if (prach_tx_count > 0) {
prach_detection = (double)prach_rx_count / (double)prach_tx_count;
}
// Print PUCCH
if (metrics.gnb_stack.pucch.count > 0) {
srsran::console("PUCCH DMRS Receiver metrics:\n");
srsran::console(" +------------+------------+------------+------------+\n");
srsran::console(" | %10s | %10s | %10s | %10s |\n", "Measure", "Average", "Min", "Max");
srsran::console(" +------------+------------+------------+------------+\n");
srsran::console(" | %10s | %+10.2f | %+10.2f | %+10.2f |\n",
"EPRE (dB)",
metrics.gnb_stack.pucch.epre_db_avg,
metrics.gnb_stack.pucch.epre_db_min,
metrics.gnb_stack.pucch.epre_db_max);
srsran::console(" | %10s | %+10.2f | %+10.2f | %+10.2f |\n",
"RSRP (dB)",
metrics.gnb_stack.pucch.rsrp_db_avg,
metrics.gnb_stack.pucch.rsrp_db_min,
metrics.gnb_stack.pucch.rsrp_db_max);
srsran::console(" | %10s | %+10.2f | %+10.2f | %+10.2f |\n",
"SINR (dB)",
metrics.gnb_stack.pucch.snr_db_avg,
metrics.gnb_stack.pucch.snr_db_min,
metrics.gnb_stack.pucch.snr_db_max);
srsran::console(" | %10s | %+10.2f | %+10.2f | %+10.2f |\n",
"TA (us)",
metrics.gnb_stack.pucch.ta_us_avg,
metrics.gnb_stack.pucch.ta_us_min,
metrics.gnb_stack.pucch.ta_us_max);
srsran::console(" +------------+------------+------------+------------+\n");
}
// Print PDSCH metrics if scheduled
double pdsch_bler = 0.0;
if (metrics.gnb_stack.mac.tx_pkts > 0) {
pdsch_bler = (double)metrics.gnb_stack.mac.tx_errors / (double)metrics.gnb_stack.mac.tx_pkts;
float pdsch_shed_rate = 0.0f;
pdsch_shed_rate = (float)metrics.gnb_stack.mac.tx_brate / (float)metrics.gnb_stack.mac.tx_pkts / 1000.0f;
srsran::console("PDSCH:\n");
srsran::console(" Count: %d\n", metrics.gnb_stack.mac.tx_pkts);
srsran::console(" BLER: %f\n", pdsch_bler);
srsran::console(" Sched Rate: %f Mbps\n", pdsch_shed_rate);
srsran::console(" Net Rate: %f Mbps\n", (1.0f - pdsch_bler) * pdsch_shed_rate);
srsran::console(" Retx Rate: %f Mbps\n", pdsch_bler * pdsch_shed_rate);
srsran::console("\n");
}
// Print PUSCH metrics if scheduled
double pusch_bler = 0.0;
if (metrics.gnb_stack.mac.rx_pkts > 0) {
if (metrics.gnb_stack.mac.rx_pkts != 0) {
pusch_bler = (double)metrics.gnb_stack.mac.rx_errors / (double)metrics.gnb_stack.mac.rx_pkts;
}
float pusch_shed_rate = 0.0f;
if (metrics.gnb_stack.mac.rx_pkts != 0) {
pusch_shed_rate = (float)metrics.gnb_stack.mac.rx_brate / (float)metrics.gnb_stack.mac.rx_pkts / 1000.0f;
}
srsran::console("PUSCH:\n");
srsran::console(" Count: %d\n", metrics.gnb_stack.mac.rx_pkts);
srsran::console(" BLER: %f\n", pusch_bler);
srsran::console(" Sched Rate: %f Mbps\n", pusch_shed_rate);
srsran::console(" Net Rate: %f Mbps\n", (1.0f - pusch_bler) * pusch_shed_rate);
srsran::console(" Retx Rate: %f Mbps\n", pusch_bler * pusch_shed_rate);
srsran::console("\n");
}
// Print PUSCH
if (metrics.gnb_stack.pusch.count > 0) {
srsran::console("PUSCH DMRS Receiver metrics:\n");
srsran::console(" +------------+------------+------------+------------+\n");
srsran::console(" | %10s | %10s | %10s | %10s |\n", "Measure", "Average", "Min", "Max");
srsran::console(" +------------+------------+------------+------------+\n");
srsran::console(" | %10s | %+10.2f | %+10.2f | %+10.2f |\n",
"EPRE (dB)",
metrics.gnb_stack.pusch.epre_db_avg,
metrics.gnb_stack.pusch.epre_db_min,
metrics.gnb_stack.pusch.epre_db_max);
srsran::console(" | %10s | %+10.2f | %+10.2f | %+10.2f |\n",
"RSRP (dB)",
metrics.gnb_stack.pusch.rsrp_db_avg,
metrics.gnb_stack.pusch.rsrp_db_min,
metrics.gnb_stack.pusch.rsrp_db_max);
srsran::console(" | %10s | %+10.2f | %+10.2f | %+10.2f |\n",
"SINR (dB)",
metrics.gnb_stack.pusch.snr_db_avg,
metrics.gnb_stack.pusch.snr_db_min,
metrics.gnb_stack.pusch.snr_db_max);
srsran::console(" | %10s | %+10.2f | %+10.2f | %+10.2f |\n",
"TA (us)",
metrics.gnb_stack.pusch.ta_us_avg,
metrics.gnb_stack.pusch.ta_us_min,
metrics.gnb_stack.pusch.ta_us_max);
srsran::console(" +------------+------------+------------+------------+\n");
}
srsran::console("UCI stats:\n");
srsran::console(" +------------+------------+------------+------------+------------+\n");
srsran::console(
" | %10s | %10s | %10s | %10s | %10s |\n", "Field", "Transmit'd", "Received", "Detection", "Avg. Val.");
srsran::console(" +------------+------------+------------+------------+------------+\n");
// Print SR
double sr_detection = 0.0;
if (metrics.ue_stack.sr_count > 0) {
sr_detection = (double)metrics.gnb_stack.sr_count / (double)metrics.ue_stack.sr_count;
srsran::console(" | %10s | %10d | %10d | %10.5f | %10s |\n",
"SR",
metrics.ue_stack.sr_count,
metrics.gnb_stack.sr_count,
sr_detection,
"-");
}
// Print SR
double cqi_detection = 0.0;
if (metrics.gnb_stack.cqi_count > 0) {
cqi_detection = (double)metrics.gnb_stack.cqi_valid_count / (double)metrics.gnb_stack.cqi_count;
srsran::console(" | %10s | %10d | %10d | %10.5f | %10.5f |\n",
"CQI",
metrics.gnb_stack.cqi_count,
metrics.gnb_stack.cqi_valid_count,
cqi_detection,
metrics.gnb_stack.mac.dl_cqi);
}
srsran::console(" +------------+------------+------------+------------+------------+\n");
// Assert metrics
srsran_assert(metrics.gnb_stack.mac.tx_pkts == 0 or pdsch_bler <= assert_pdsch_bler_max,
"PDSCH BLER (%f) exceeds the assertion maximum (%f)",
pdsch_bler,
assert_pusch_bler_max);
srsran_assert(metrics.gnb_stack.mac.rx_pkts == 0 or pusch_bler <= assert_pusch_bler_max,
"PUSCH BLER (%f) exceeds the assertion maximum (%f)",
pusch_bler,
assert_pusch_bler_max);
srsran_assert(metrics.ue_stack.sr_count == 0 or sr_detection >= assert_sr_detection_min,
"SR detection probability (%f) did not reach the assertion minimum (%f)",
sr_detection,
assert_sr_detection_min);
srsran_assert(metrics.gnb_stack.cqi_count == 0 or cqi_detection >= assert_cqi_detection_min,
"CQI report detection probability (%f) did not reach the assertion minimum (%f)",
cqi_detection,
assert_sr_detection_min);
srsran_assert(prach_tx_count == 0 or prach_detection >= assert_prach_detection_min,
"PRACH detection probability (%f) did not reach the assertion minimum (%f)",
prach_detection,
assert_prach_detection_min);
srsran_assert(prach_tx_count == 0 or (prach_ta >= assert_prach_ta_min and prach_ta <= assert_prach_ta_max),
"PRACH TA average measurement %f is higher than minimum (%d) or above maximum (%f)",
prach_ta,
assert_prach_ta_min,
assert_prach_ta_max);
srsran_assert(metrics.gnb_stack.pucch.count == 0 or (metrics.gnb_stack.pucch.snr_db_min >= assert_pucch_snr_min),
"Minimum PUCCH DMRS SNR %f is below the minimum (%d)",
metrics.gnb_stack.pucch.snr_db_min,
assert_pucch_snr_min);
// If reached here, the test is successful
return SRSRAN_SUCCESS;
}
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