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srsRAN/srsue/src/phy/sync.cc

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/*
* Copyright 2013-2020 Software Radio Systems Limited
*
* This file is part of srsLTE.
*
* srsLTE 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.
*
* 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
* 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 "srsue/hdr/phy/sync.h"
#include "srslte/common/log.h"
#include "srslte/phy/channel/channel.h"
#include "srslte/srslte.h"
#include "srsue/hdr/phy/sf_worker.h"
#include <algorithm>
#include <unistd.h>
#define Error(fmt, ...) \
if (SRSLTE_DEBUG_ENABLED) \
log_h->error(fmt, ##__VA_ARGS__)
#define Warning(fmt, ...) \
if (SRSLTE_DEBUG_ENABLED) \
log_h->warning(fmt, ##__VA_ARGS__)
#define Info(fmt, ...) \
if (SRSLTE_DEBUG_ENABLED) \
log_h->info(fmt, ##__VA_ARGS__)
#define Debug(fmt, ...) \
if (SRSLTE_DEBUG_ENABLED) \
log_h->debug(fmt, ##__VA_ARGS__)
namespace srsue {
static int
radio_recv_callback(void* obj, cf_t* data[SRSLTE_MAX_CHANNELS], uint32_t nsamples, srslte_timestamp_t* rx_time)
{
srslte::rf_buffer_t x(data, nsamples);
return ((sync*)obj)->radio_recv_fnc(x, rx_time);
}
static SRSLTE_AGC_CALLBACK(callback_set_rx_gain)
{
((sync*)h)->set_rx_gain(gain_db);
}
void sync::init(srslte::radio_interface_phy* _radio,
stack_interface_phy_lte* _stack,
prach* _prach_buffer,
srslte::thread_pool* _workers_pool,
phy_common* _worker_com,
srslte::log* _log_h,
srslte::log* _log_phy_lib_h,
uint32_t prio,
int sync_cpu_affinity)
{
radio_h = _radio;
log_h = _log_h;
log_phy_lib_h = _log_phy_lib_h;
stack = _stack;
workers_pool = _workers_pool;
worker_com = _worker_com;
prach_buffer = _prach_buffer;
nof_rf_channels = worker_com->args->nof_carriers * worker_com->args->nof_rx_ant;
if (nof_rf_channels == 0 || nof_rf_channels > SRSLTE_MAX_CHANNELS) {
Error("SYNC: Invalid number of RF channels (%d)\n", nof_rf_channels);
return;
}
if (srslte_ue_sync_init_multi(&ue_sync, SRSLTE_MAX_PRB, false, radio_recv_callback, nof_rf_channels, this) !=
SRSLTE_SUCCESS) {
Error("SYNC: Initiating ue_sync\n");
return;
}
if (worker_com->args->dl_channel_args.enable) {
channel_emulator = srslte::channel_ptr(new srslte::channel(worker_com->args->dl_channel_args, nof_rf_channels));
}
nof_workers = workers_pool->get_nof_workers();
worker_com->set_nof_workers(nof_workers);
// Initialize cell searcher
search_p.init(sf_buffer, log_h, nof_rf_channels, this);
// Initialize SFN synchronizer, it uses only pcell buffer
sfn_p.init(&ue_sync, worker_com->args, sf_buffer, sf_buffer.size(), log_h);
// Start intra-frequency measurement
for (uint32_t i = 0; i < worker_com->args->nof_carriers; i++) {
scell::intra_measure* q = new scell::intra_measure;
q->init(i, worker_com, this, log_h);
intra_freq_meas.push_back(std::unique_ptr<scell::intra_measure>(q));
}
// Allocate Secondary serving cell synchronization
for (uint32_t i = 1; i < worker_com->args->nof_carriers; i++) {
// Give the logical channel
scell_sync[i] = std::unique_ptr<scell::sync>(new scell::sync(this, i * worker_com->args->nof_rx_ant));
}
reset();
running = true;
// Enable AGC for primary cell receiver
set_agc_enable(worker_com->args->agc_enable);
// Start main thread
if (sync_cpu_affinity < 0) {
start(prio);
} else {
start_cpu(prio, sync_cpu_affinity);
}
}
sync::~sync()
{
srslte_ue_sync_free(&ue_sync);
}
void sync::stop()
{
worker_com->semaphore.wait_all();
for (auto& q : intra_freq_meas) {
q->stop();
}
running = false;
wait_thread_finish();
}
void sync::reset()
{
in_sync_cnt = 0;
out_of_sync_cnt = 0;
current_earfcn = -1;
srate_mode = SRATE_NONE;
sfn_p.reset();
search_p.reset();
}
/**
* Higher layers API.
*
* These functions are called by higher layers (RRC) to control the Cell search and cell selection procedures.
* They manipulate the SYNC state machine to switch states and perform different actions. In order to ensure mutual
* exclusion any change of state variables such as cell configuration, MIB decoder, etc. must be done while the
* SYNC thread is in IDLE.
*
* Functions will manipulate the SYNC state machine (sync_state class) to jump to states and wait for result then
* return the result to the higher layers.
*
* Cell Search:
* It's the process of searching for cells in the bands or set of EARFCNs supported by the UE. Cell search is performed
* at 1.92 MHz sampling rate and involves PSS/SSS synchronization (PCI extraction) and MIB decoding for number of Ports
* and PRB.
*
*
* Cell Select:
* It's the process of moving the cell state from IDLE->CAMPING or from CAMPING->IDLE->CAMPING when RRC indicates to
* select a different cell.
*
* If it is a new cell, the reconfiguration must take place while sync_state is on IDLE.
*
* cell_search() and cell_select() functions can not be called concurrently. A mutex is used to prevent it from
* happening.
*
*/
/* A call to cell_search() finds the strongest cell in the set of supported EARFCNs. When the first cell is found,
* returns 1 and stores cell information and RSRP values in the pointers (if provided). If a cell is not found in the
* current frequency it moves to the next one and the next call to cell_search() will look in the next EARFCN in the
* set. If no cells are found in any frequency it returns 0. If error returns -1.
*
* The first part of the procedure (call to _init()) moves the PHY To IDLE, ensuring that no UL/DL/PRACH will happen
*
*/
bool sync::cell_search_init()
{
std::unique_lock<std::mutex> ul(rrc_mutex);
if (rrc_proc_state != PROC_IDLE) {
Error("Cell Search: Can't start procedure. SYNC already running a procedure (%d)\n", (uint32_t)rrc_proc_state);
return false;
}
// Move state to IDLE
Info("Cell Search: Start EARFCN index=%u/%zd\n", cellsearch_earfcn_index, worker_com->args->dl_earfcn_list.size());
phy_state.go_idle();
worker_com->reset();
// Stop all intra-frequency measurement before changing frequency
meas_stop();
rrc_proc_state = PROC_SEARCH_START;
return true;
}
rrc_interface_phy_lte::cell_search_ret_t sync::cell_search_start(phy_cell_t* found_cell)
{
std::unique_lock<std::mutex> ul(rrc_mutex);
rrc_interface_phy_lte::cell_search_ret_t ret = {};
ret.found = rrc_interface_phy_lte::cell_search_ret_t::ERROR;
ret.last_freq = rrc_interface_phy_lte::cell_search_ret_t::NO_MORE_FREQS;
if (rrc_proc_state != PROC_SEARCH_START) {
Error("Cell Search: Can't run procedure. Must call cell_search_init() first (%d)\n", (uint32_t)rrc_proc_state);
return ret;
}
rrc_proc_state = PROC_SEARCH_RUNNING;
if (srate_mode != SRATE_FIND) {
srate_mode = SRATE_FIND;
radio_h->set_rx_srate(1.92e6);
radio_h->set_tx_srate(1.92e6);
Info("SYNC: Setting Cell Search sampling rate\n");
}
try {
if (current_earfcn != (int)worker_com->args->dl_earfcn_list.at(cellsearch_earfcn_index)) {
current_earfcn = (int)worker_com->args->dl_earfcn_list[cellsearch_earfcn_index];
Info("Cell Search: changing frequency to EARFCN=%d\n", current_earfcn);
set_frequency();
}
} catch (const std::out_of_range& oor) {
Error("Index %d is not a valid EARFCN element.\n", cellsearch_earfcn_index);
return ret;
}
// Move to CELL SEARCH and wait to finish
Info("Cell Search: Setting Cell search state\n");
phy_state.run_cell_search();
// Check return state
switch (cell_search_ret) {
case search::CELL_FOUND:
log_h->info("Cell Search: Found cell with PCI=%d with %d PRB\n", cell.id, cell.nof_prb);
if (found_cell) {
found_cell->earfcn = current_earfcn;
found_cell->pci = cell.id;
found_cell->cfo_hz = search_p.get_last_cfo();
}
ret.found = rrc_interface_phy_lte::cell_search_ret_t::CELL_FOUND;
break;
case search::CELL_NOT_FOUND:
Info("Cell Search: No cell found in this frequency\n");
ret.found = rrc_interface_phy_lte::cell_search_ret_t::CELL_NOT_FOUND;
break;
default:
Error("Cell Search: while receiving samples\n");
radio_error();
break;
}
cellsearch_earfcn_index++;
if (cellsearch_earfcn_index >= worker_com->args->dl_earfcn_list.size()) {
Info("Cell Search: No more frequencies in the current EARFCN set\n");
cellsearch_earfcn_index = 0;
ret.last_freq = rrc_interface_phy_lte::cell_search_ret_t::NO_MORE_FREQS;
} else {
ret.last_freq = rrc_interface_phy_lte::cell_search_ret_t::MORE_FREQS;
}
rrc_proc_state = PROC_IDLE;
return ret;
}
/* Cell select synchronizes to a new cell (e.g. during HO or during cell reselection on IDLE) or
* re-synchronizes with the current cell if cell argument is NULL
* The first phase of the procedure verifies the validity of the input parameters and switches the
* PHY to IDLE. Once this function returns, the PHY will not process any DL/UL nor will PRACH
*
* See cell_select_start()
*/
bool sync::cell_select_init(phy_cell_t new_cell)
{
std::unique_lock<std::mutex> ul(rrc_mutex);
if (rrc_proc_state != PROC_IDLE) {
Error("Cell Select: Can't start procedure. SYNC already running a procedure (%d)\n", (uint32_t)rrc_proc_state);
return false;
}
// Move state to IDLE
if (!srslte_cellid_isvalid(new_cell.pci)) {
Error("Cell Select: Invalid cell_id=%d\n", new_cell.pci);
return false;
}
Info("Cell Select: Going to IDLE\n");
phy_state.go_idle();
worker_com->reset();
// Stop intra-frequency measurements if need to change frequency
if ((int)new_cell.earfcn != current_earfcn) {
meas_stop();
}
rrc_proc_state = PROC_SELECT_START;
return true;
}
bool sync::cell_select_start(phy_cell_t new_cell)
{
std::unique_lock<std::mutex> ul(rrc_mutex);
if (rrc_proc_state != PROC_SELECT_START) {
Error("Cell Select: Can't run procedure. Must call cell_select_init() first (%d)\n", (uint32_t)rrc_proc_state);
return false;
}
rrc_proc_state = PROC_SELECT_RUNNING;
bool ret = false;
sfn_p.reset();
search_p.reset();
srslte_ue_sync_reset(&ue_sync);
/* Reconfigure cell if necessary */
cell.id = new_cell.pci;
if (not set_cell(new_cell.cfo_hz)) {
Error("Cell Select: Reconfiguring cell\n");
return false;
}
/* Select new frequency if necessary */
if ((int)new_cell.earfcn != current_earfcn) {
current_earfcn = new_cell.earfcn;
Info("Cell Select: Setting new frequency EARFCN=%d\n", new_cell.earfcn);
if (!set_frequency()) {
Error("Cell Select: Setting new frequency EARFCN=%d\n", new_cell.earfcn);
return false;
}
}
// Reconfigure first intra-frequency measurement
intra_freq_meas[0]->set_primary_cell(current_earfcn, cell);
// Change sampling rate if necessary
if (srate_mode != SRATE_CAMP) {
log_h->info("Cell Select: Setting CAMPING sampling rate\n");
set_sampling_rate();
}
// SFN synchronization
phy_state.run_sfn_sync();
if (phy_state.is_camping()) {
Info("Cell Select: SFN synchronized. CAMPING...\n");
stack->in_sync();
ret = true;
} else {
Info("Cell Select: Could not synchronize SFN\n");
}
rrc_proc_state = PROC_IDLE;
return ret;
}
bool sync::cell_is_camping()
{
return phy_state.is_camping();
}
void sync::run_cell_search_state()
{
cell_search_ret = search_p.run(&cell, mib);
if (cell_search_ret == search::CELL_FOUND) {
stack->bch_decoded_ok(SYNC_CC_IDX, mib.data(), mib.size() / 8);
}
phy_state.state_exit();
}
void sync::run_sfn_sync_state()
{
srslte_cell_t temp_cell = cell;
switch (sfn_p.run_subframe(&temp_cell, &tti, mib)) {
case sfn_sync::SFN_FOUND:
if (memcmp(&cell, &temp_cell, sizeof(srslte_cell_t)) != 0) {
srslte_cell_fprint(stdout, &cell, 0);
srslte_cell_fprint(stdout, &temp_cell, 0);
log_h->error("Detected cell during SFN synchronization differs from configured cell. Cell reselection to "
"cells with different MIB is not supported\n");
srslte::out_stream("Detected cell during SFN synchronization differs from configured cell. Cell reselection "
"to cells with different MIB is not supported\n");
phy_state.state_exit(false);
}
stack->in_sync();
phy_state.state_exit();
break;
case sfn_sync::IDLE:
break;
default:
phy_state.state_exit(false);
break;
}
}
void sync::run_camping_in_sync_state(sf_worker* worker, srslte::rf_buffer_t& sync_buffer)
{
// Check tti is synched with ue_sync
if (srslte_ue_sync_get_sfidx(&ue_sync) != tti % 10) {
uint32_t sfn = tti / 10;
tti = (sfn * 10 + srslte_ue_sync_get_sfidx(&ue_sync)) % 10240;
// Force SFN decode, just in case it is in the wrong frame
force_camping_sfn_sync = true;
}
// Run secondary serving cell synchronization
for (auto& e : scell_sync) {
e.second->run(tti, sync_buffer.get(e.first, 0, worker_com->args->nof_rx_ant));
}
if (is_overflow) {
force_camping_sfn_sync = true;
is_overflow = false;
log_h->info("Detected overflow, trying to resync SFN\n");
}
// Force decode MIB if required
if (force_camping_sfn_sync) {
uint32_t _tti = 0;
srslte_cell_t temp_cell = cell;
sfn_sync::ret_code ret = sfn_p.decode_mib(&temp_cell, &_tti, &sync_buffer, mib);
if (ret == sfn_sync::SFN_FOUND) {
// Force tti
tti = _tti;
// Disable
force_camping_sfn_sync = false;
if (memcmp(&cell, &temp_cell, sizeof(srslte_cell_t)) != 0) {
log_h->error("Detected cell during SFN synchronization differs from configured cell. Cell "
"reselection to cells with different MIB is not supported\n");
srslte::out_stream("Detected cell during SFN synchronization differs from configured cell. Cell "
"reselection to cells with different MIB is not supported\n");
} else {
log_h->info("SFN resynchronized successfully\n");
}
} else {
log_h->warning("SFN not yet synchronized, sending out-of-sync\n");
}
}
Debug("SYNC: Worker %d synchronized\n", worker->get_id());
metrics.sfo = srslte_ue_sync_get_sfo(&ue_sync);
metrics.cfo = srslte_ue_sync_get_cfo(&ue_sync);
metrics.ta_us = worker_com->ta.get_usec();
for (uint32_t i = 0; i < worker_com->args->nof_carriers; i++) {
worker_com->set_sync_metrics(i, metrics);
}
// Check if we need to TX a PRACH
if (prach_buffer->is_ready_to_send(tti, cell.id)) {
prach_ptr = prach_buffer->generate(get_tx_cfo(), &prach_nof_sf, &prach_power);
if (prach_ptr == nullptr) {
Error("Generating PRACH\n");
}
}
worker->set_prach(prach_ptr ? &prach_ptr[prach_sf_cnt * SRSLTE_SF_LEN_PRB(cell.nof_prb)] : nullptr, prach_power);
// Set CFO for all Carriers
for (uint32_t cc = 0; cc < worker_com->args->nof_carriers; cc++) {
worker->set_cfo_unlocked(cc, get_tx_cfo());
worker_com->update_cfo_measurement(cc, srslte_ue_sync_get_cfo(&ue_sync));
}
worker->set_tti(tti);
// Compute TX time: Any transmission happens in TTI+4 thus advance 4 ms the reception time
last_rx_time.add(FDD_HARQ_DELAY_DL_MS * 1e-3);
worker->set_tx_time(last_rx_time);
// Advance/reset prach subframe pointer
if (prach_ptr) {
prach_sf_cnt++;
if (prach_sf_cnt == prach_nof_sf) {
prach_sf_cnt = 0;
prach_ptr = nullptr;
}
}
// Start worker
worker_com->semaphore.push(worker);
workers_pool->start_worker(worker);
}
void sync::run_camping_state()
{
sf_worker* worker = (sf_worker*)workers_pool->wait_worker(tti);
srslte::rf_buffer_t sync_buffer = {};
if (worker == nullptr) {
// wait_worker() only returns NULL if it's being closed. Quit now to avoid unnecessary loops here
running = false;
return;
}
// Map carrier/antenna buffers to worker buffers
for (uint32_t c = 0; c < worker_com->args->nof_carriers; c++) {
for (uint32_t i = 0; i < worker_com->args->nof_rx_ant; i++) {
sync_buffer.set(c, i, worker_com->args->nof_rx_ant, worker->get_buffer(c, i));
}
}
// Primary Cell (PCell) Synchronization
switch (srslte_ue_sync_zerocopy(&ue_sync, sync_buffer.to_cf_t(), worker->get_buffer_len())) {
case 1:
run_camping_in_sync_state(worker, sync_buffer);
break;
case 0:
Warning("SYNC: Out-of-sync detected in PSS/SSS\n");
out_of_sync();
worker->release();
// Force decoding MIB, for making sure that the TTI will be right
if (!force_camping_sfn_sync) {
force_camping_sfn_sync = true;
}
break;
default:
radio_error();
worker->release();
break;
}
// Run stack
Debug("run_stack_tti: from main\n");
run_stack_tti();
}
void sync::run_idle_state()
{
if (radio_h->is_init()) {
uint32_t nsamples = 1920;
if (std::isnormal(current_srate) and current_srate > 0.0f) {
nsamples = current_srate / 1000;
}
Debug("Discarding %d samples\n", nsamples);
srslte_timestamp_t rx_time = {};
dummy_buffer.set_nof_samples(nsamples);
if (radio_recv_fnc(dummy_buffer, &rx_time) == SRSLTE_SUCCESS) {
srslte::out_stream("SYNC: Receiving from radio while in IDLE_RX\n");
}
// If radio is in locked state returns immediately. In that case, do a 1 ms sleep
if (rx_time.frac_secs == 0 && rx_time.full_secs == 0) {
usleep(1000);
}
radio_h->tx_end();
} else {
Debug("Sleeping\n");
usleep(1000);
}
}
void sync::run_thread()
{
while (running) {
Debug("SYNC: state=%s, tti=%d\n", phy_state.to_string(), tti);
// If not camping, clear SFN sync
if (!phy_state.is_camping()) {
force_camping_sfn_sync = false;
}
if (log_phy_lib_h) {
log_phy_lib_h->step(tti);
}
switch (phy_state.run_state()) {
case sync_state::CELL_SEARCH:
run_cell_search_state();
break;
case sync_state::SFN_SYNC:
run_sfn_sync_state();
break;
case sync_state::CAMPING:
run_camping_state();
break;
case sync_state::IDLE:
run_idle_state();
break;
}
// Increase TTI counter
tti = TTI_ADD(tti, 1);
}
}
/***************
*
* Utility functions called by the main thread or by functions called by other threads
*
*/
void sync::radio_overflow()
{
is_overflow = true;
}
void sync::radio_error()
{
log_h->error("SYNC: Receiving from radio.\n");
// Need to find a method to effectively reset radio, reloading the driver does not work
radio_h->reset();
}
void sync::in_sync()
{
in_sync_cnt++;
// Send RRC in-sync signal after 100 ms consecutive subframes
if (in_sync_cnt == worker_com->args->nof_in_sync_events) {
stack->in_sync();
in_sync_cnt = 0;
out_of_sync_cnt = 0;
}
}
// Out of sync called by worker or sync every 1 or 5 ms
void sync::out_of_sync()
{
// Send RRC out-of-sync signal after NOF_OUT_OF_SYNC_SF consecutive subframes
Info("Out-of-sync %d/%d\n", out_of_sync_cnt, worker_com->args->nof_out_of_sync_events);
out_of_sync_cnt++;
if (out_of_sync_cnt == worker_com->args->nof_out_of_sync_events) {
Info("Sending to RRC\n");
stack->out_of_sync();
out_of_sync_cnt = 0;
in_sync_cnt = 0;
}
}
void sync::set_cfo(float cfo)
{
srslte_ue_sync_set_cfo_ref(&ue_sync, cfo);
}
void sync::set_agc_enable(bool enable)
{
// If not enabled, make sure it is not used and return
if (not enable) {
ue_sync.do_agc = false;
return;
}
// Early return if the AGC is enabled
if (ue_sync.do_agc) {
return;
}
// PHY and radio must have been initialised
if (not running or radio_h == nullptr) {
ERROR("Error setting AGC: PHY not initiated\n");
return;
}
// Get radio info and check it is valid
srslte_rf_info_t* rf_info = radio_h->get_info();
if (rf_info == nullptr) {
Error("Error: Radio does not provide RF information\n");
return;
}
// Enable AGC
srslte_ue_sync_start_agc(
&ue_sync, callback_set_rx_gain, rf_info->min_rx_gain, rf_info->max_rx_gain, radio_h->get_rx_gain());
search_p.set_agc_enable(true);
}
float sync::get_tx_cfo()
{
float cfo = srslte_ue_sync_get_cfo(&ue_sync);
float ret = cfo * ul_dl_factor;
if (worker_com->args->cfo_is_doppler) {
ret *= -1;
} else {
/* Compensates the radio frequency offset applied equally to DL and UL. Does not work in doppler mode */
if (radio_h->get_freq_offset() != 0.0f) {
const float offset_hz = (float)radio_h->get_freq_offset() * (1.0f - ul_dl_factor);
ret = cfo - offset_hz;
}
}
return ret / 15000;
}
void sync::set_ue_sync_opts(srslte_ue_sync_t* q, float cfo)
{
if (worker_com->args->cfo_integer_enabled) {
srslte_ue_sync_set_cfo_i_enable(q, true);
}
srslte_ue_sync_set_cfo_ema(q, worker_com->args->cfo_pss_ema);
srslte_ue_sync_set_cfo_tol(q, worker_com->args->cfo_correct_tol_hz);
srslte_ue_sync_set_cfo_loop_bw(q,
worker_com->args->cfo_loop_bw_pss,
worker_com->args->cfo_loop_bw_ref,
worker_com->args->cfo_loop_pss_tol,
worker_com->args->cfo_loop_ref_min,
worker_com->args->cfo_loop_pss_tol,
worker_com->args->cfo_loop_pss_conv);
// Disable CP based CFO estimation during find
if (std::isnormal(cfo)) {
srslte_ue_sync_cfo_reset(q, cfo);
q->cfo_current_value = cfo / 15000;
q->cfo_is_copied = true;
q->cfo_correct_enable_find = true;
srslte_sync_set_cfo_cp_enable(&q->sfind, false, 0);
}
// Set SFO ema and correct period
srslte_ue_sync_set_sfo_correct_period(q, worker_com->args->sfo_correct_period);
srslte_ue_sync_set_sfo_ema(q, worker_com->args->sfo_ema);
sss_alg_t sss_alg = SSS_FULL;
if (!worker_com->args->sss_algorithm.compare("diff")) {
sss_alg = SSS_DIFF;
} else if (!worker_com->args->sss_algorithm.compare("partial")) {
sss_alg = SSS_PARTIAL_3;
} else if (!worker_com->args->sss_algorithm.compare("full")) {
sss_alg = SSS_FULL;
} else {
Warning("SYNC: Invalid SSS algorithm %s. Using 'full'\n", worker_com->args->sss_algorithm.c_str());
}
srslte_sync_set_sss_algorithm(&q->strack, (sss_alg_t)sss_alg);
srslte_sync_set_sss_algorithm(&q->sfind, (sss_alg_t)sss_alg);
}
bool sync::set_cell(float cfo)
{
// Wait the SYNC thread to transition to IDLE
uint32_t cnt = 0;
while (!phy_state.is_idle() && cnt <= 20) {
Info("SYNC: PHY state is_idle=%d, cnt=%d\n", phy_state.is_idle(), cnt);
usleep(500);
cnt++;
}
if (!phy_state.is_idle()) {
Error("Can not change Cell while not in IDLE\n");
return false;
}
if (!srslte_cell_isvalid(&cell)) {
Error("SYNC: Setting cell: invalid cell (nof_prb=%d, pci=%d, ports=%d)\n", cell.nof_prb, cell.id, cell.nof_ports);
return false;
}
// Set cell in all objects
if (srslte_ue_sync_set_cell(&ue_sync, cell)) {
Error("SYNC: Setting cell: initiating ue_sync\n");
return false;
}
sfn_p.set_cell(cell);
worker_com->set_cell(cell);
// Reset cell configuration
for (uint32_t i = 0; i < nof_workers; i++) {
((sf_worker*)workers_pool->get_worker(i))->reset_cell_unlocked(0);
}
bool success = true;
for (uint32_t i = 0; i < workers_pool->get_nof_workers(); i++) {
sf_worker* w = (sf_worker*)workers_pool->wait_worker_id(i);
if (w) {
success &= w->set_cell_unlocked(0, cell);
w->release();
}
}
if (!success) {
Error("SYNC: Setting cell: initiating PHCH worker\n");
return false;
}
// Set options defined in expert section
set_ue_sync_opts(&ue_sync, cfo);
// Reset ue_sync and set CFO/gain from search procedure
srslte_ue_sync_reset(&ue_sync);
return true;
}
void sync::force_freq(float dl_freq_, float ul_freq_)
{
dl_freq = dl_freq_;
ul_freq = ul_freq_;
}
bool sync::set_frequency()
{
double set_dl_freq = 0;
double set_ul_freq = 0;
if (dl_freq > 0 && ul_freq > 0) {
set_dl_freq = dl_freq;
set_ul_freq = ul_freq;
} else {
set_dl_freq = 1e6 * srslte_band_fd(current_earfcn);
if (srslte_band_is_tdd(srslte_band_get_band(current_earfcn))) {
set_ul_freq = set_dl_freq;
} else {
set_ul_freq = 1e6 * srslte_band_fu(worker_com->get_ul_earfcn(current_earfcn));
}
}
if (set_dl_freq > 0 && set_ul_freq > 0) {
log_h->info("SYNC: Set DL EARFCN=%d, f_dl=%.1f MHz, f_ul=%.1f MHz\n",
current_earfcn,
set_dl_freq / 1e6,
set_ul_freq / 1e6);
// Logical channel is 0
radio_h->set_rx_freq(0, set_dl_freq);
radio_h->set_tx_freq(0, set_ul_freq);
ul_dl_factor = (float)(set_ul_freq / set_dl_freq);
srslte_ue_sync_reset(&ue_sync);
return true;
} else {
log_h->error("SYNC: Cell Search: Invalid EARFCN=%d\n", current_earfcn);
return false;
}
}
void sync::set_sampling_rate()
{
float new_srate = (float)srslte_sampling_freq_hz(cell.nof_prb);
if (new_srate < 0.0) {
Error("Invalid sampling rate for %d PRBs. keeping same.\n", cell.nof_prb);
return;
}
if (current_srate != new_srate || srate_mode != SRATE_CAMP) {
current_srate = new_srate;
Info("SYNC: Setting sampling rate %.2f MHz\n", current_srate / 1000000);
srate_mode = SRATE_CAMP;
radio_h->set_rx_srate(current_srate);
radio_h->set_tx_srate(current_srate);
} else {
Error("Error setting sampling rate for cell with %d PRBs\n", cell.nof_prb);
}
}
uint32_t sync::get_current_tti()
{
return tti;
}
void sync::get_current_cell(srslte_cell_t* cell_, uint32_t* earfcn_)
{
if (cell_) {
*cell_ = cell;
}
if (earfcn_) {
*earfcn_ = current_earfcn;
}
}
int sync::radio_recv_fnc(srslte::rf_buffer_t& data, srslte_timestamp_t* rx_time)
{
// This function is designed for being called from the UE sync object which will pass a null rx_time in case
// receive dummy samples. So, rf_timestamp points at dummy timestamp in case rx_time is not provided
srslte::rf_timestamp_t dummy_ts = {};
srslte::rf_timestamp_t& rf_timestamp = (rx_time == nullptr) ? dummy_ts : last_rx_time;
// Receive
if (not radio_h->rx_now(data, rf_timestamp)) {
return SRSLTE_ERROR;
}
srslte_timestamp_t dummy_flat_ts = {};
// Load flat timestamp
if (rx_time == nullptr) {
rx_time = &dummy_flat_ts;
}
*rx_time = rf_timestamp.get(0);
// Save RF timestamp for the stack
stack_tti_ts_new = rf_timestamp.get(0);
// Run stack if the sync state is not in camping
if (not phy_state.is_camping()) {
Debug("run_stack_tti: from recv\n");
run_stack_tti();
}
// Execute channel DL emulator
if (channel_emulator and rx_time) {
channel_emulator->set_srate((uint32_t)current_srate);
channel_emulator->run(data.to_cf_t(), data.to_cf_t(), data.get_nof_samples(), *rx_time);
}
// Save signal for Intra-frequency measurement
if (srslte_cell_isvalid(&cell)) {
for (uint32_t i = 0; (uint32_t)i < intra_freq_meas.size(); i++) {
intra_freq_meas[i]->write(tti, data.get(i, 0, worker_com->args->nof_rx_ant), SRSLTE_SF_LEN_PRB(cell.nof_prb));
// Update RX gain
intra_freq_meas[i]->set_rx_gain_offset(worker_com->get_rx_gain_offset());
}
}
log_h->debug("SYNC: received %d samples from radio\n", data.get_nof_samples());
return data.get_nof_samples();
}
void sync::run_stack_tti()
{
// check timestamp reset
if (forced_rx_time_init || srslte_timestamp_iszero(&stack_tti_ts) ||
srslte_timestamp_compare(&stack_tti_ts_new, &stack_tti_ts) < 0) {
if (srslte_timestamp_compare(&stack_tti_ts_new, &stack_tti_ts) < 0) {
log_h->warning("SYNC: radio time seems to be going backwards (rx_time=%f, tti_ts=%f)\n",
srslte_timestamp_real(&stack_tti_ts_new),
srslte_timestamp_real(&stack_tti_ts));
// time-stamp will be set to rx time below and run_tti() will be called with MIN_TTI_JUMP
}
// init tti_ts with last rx time
log_h->debug("SYNC: Setting initial TTI time to %f\n", srslte_timestamp_real(&stack_tti_ts_new));
srslte_timestamp_copy(&stack_tti_ts, &stack_tti_ts_new);
forced_rx_time_init = false;
}
// Advance stack in time
if (srslte_timestamp_compare(&stack_tti_ts_new, &stack_tti_ts) >= 0) {
srslte_timestamp_t temp = {};
srslte_timestamp_copy(&temp, &stack_tti_ts_new);
srslte_timestamp_sub(&temp, stack_tti_ts.full_secs, stack_tti_ts.frac_secs);
int32_t tti_jump = static_cast<int32_t>(srslte_timestamp_uint64(&temp, 1e3));
tti_jump = SRSLTE_MAX(tti_jump, MIN_TTI_JUMP);
if (tti_jump > MAX_TTI_JUMP) {
log_h->warning("SYNC: TTI jump of %d limited to %d\n", tti_jump, MAX_TTI_JUMP);
tti_jump = SRSLTE_MIN(tti_jump, MAX_TTI_JUMP);
}
// Run stack
Debug("run_stack_tti: calling stack\n");
stack->run_tti(tti, tti_jump);
Debug("run_stack_tti: stack called\n");
}
// update timestamp
srslte_timestamp_copy(&stack_tti_ts, &stack_tti_ts_new);
}
void sync::set_rx_gain(float gain)
{
radio_h->set_rx_gain_th(gain);
}
/**********
* PHY measurements
*
*/
void sync::set_inter_frequency_measurement(uint32_t cc_idx, uint32_t earfcn_, srslte_cell_t cell_)
{
if (cc_idx < intra_freq_meas.size()) {
intra_freq_meas[cc_idx]->set_primary_cell(earfcn_, cell_);
}
}
void sync::set_cells_to_meas(uint32_t earfcn_, const std::set<uint32_t>& pci)
{
bool found = false;
for (size_t i = 0; i < intra_freq_meas.size() and not found; i++) {
if (earfcn_ == intra_freq_meas[i]->get_earfcn()) {
intra_freq_meas[i]->set_cells_to_meas(pci);
found = true;
}
}
if (!found) {
log_h->error("Neighbour cell measurement not supported in secondary carrier. EARFCN=%d\n", earfcn_);
}
}
void sync::meas_stop()
{
for (auto& q : intra_freq_meas) {
q->meas_stop();
}
}
void sync::scell_sync_set(uint32_t cc_idx, const srslte_cell_t& _cell)
{
// Ignore if out of range
if (scell_sync.count(cc_idx) == 0) {
return;
}
// Set secondary serving cell
scell_sync.at(cc_idx)->set_cell(_cell);
}
void sync::scell_sync_stop()
{
for (auto& e : scell_sync) {
e.second->stop();
}
}
void sync::cell_meas_reset(uint32_t cc_idx)
{
worker_com->neighbour_cells_reset(cc_idx);
}
void sync::new_cell_meas(uint32_t cc_idx, const std::vector<rrc_interface_phy_lte::phy_meas_t>& meas)
{
// Pass measurements to phy_common for SINR estimation
worker_com->set_neighbour_cells(cc_idx, meas);
// Pass-through to the stack
stack->new_cell_meas(meas);
}
} // namespace srsue
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