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135 lines
4.7 KiB
C++
135 lines
4.7 KiB
C++
/**
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* Copyright 2013-2021 Software Radio Systems Limited
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*
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* This file is part of srsRAN.
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*
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* srsRAN 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
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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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* srsRAN 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 Affero General Public License for more details.
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*
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* A copy of the GNU Affero 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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#ifndef SRSUE_SYNC_NR_SA_H
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#define SRSUE_SYNC_NR_SA_H
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#include "cell_search.h"
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#include "slot_sync.h"
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#include "srsran/common/threads.h"
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#include "srsran/interfaces/radio_interfaces.h"
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#include "srsran/interfaces/ue_nr_interfaces.h"
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#include "srsran/radio/rf_buffer.h"
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#include "srsran/radio/rf_timestamp.h"
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#include "srsran/srslog/logger.h"
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#include "srsran/srsran.h"
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#include "srsue/hdr/phy/sync_state.h"
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#include "worker_pool.h"
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#include <condition_variable>
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#include <mutex>
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#include <srsran/common/tti_sempahore.h>
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namespace srsue {
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namespace nr {
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/**
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* @brief NR Standalone synchronization class
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*/
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class sync_sa : public srsran::thread, public srsran::phy_common_interface
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{
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public:
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struct args_t {
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double srate_hz = 61.44e6;
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srsran_subcarrier_spacing_t ssb_min_scs = srsran_subcarrier_spacing_15kHz;
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uint32_t nof_rx_channels = 1;
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bool disable_cfo = false;
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float pbch_dmrs_thr = 0.0f; ///< PBCH DMRS correlation detection threshold (0 means auto)
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float cfo_alpha = 0.0f; ///< CFO averaging alpha (0 means auto)
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int thread_priority = 1;
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cell_search::args_t get_cell_search() const
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{
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cell_search::args_t ret = {};
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ret.max_srate_hz = srate_hz;
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return ret;
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}
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slot_sync::args_t get_slot_sync() const
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{
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slot_sync::args_t ret = {};
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ret.max_srate_hz = srate_hz;
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ret.nof_rx_channels = nof_rx_channels;
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ret.ssb_min_scs = ssb_min_scs;
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return ret;
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}
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};
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sync_sa(srslog::basic_logger& logger, worker_pool& workers_);
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~sync_sa();
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bool init(const args_t& args_, stack_interface_phy_nr* stack_, srsran::radio_interface_phy* radio_);
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bool reset();
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void stop();
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sync_state::state_t get_state();
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// The following methods control the SYNC state machine
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void cell_go_idle();
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cell_search::ret_t cell_search_run(const cell_search::cfg_t& cfg);
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rrc_interface_phy_nr::cell_select_result_t cell_select_run(const phy_interface_rrc_nr::cell_select_args_t& req);
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void worker_end(const worker_context_t& w_ctx, const bool& tx_enable, srsran::rf_buffer_t& buffer) override;
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private:
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stack_interface_phy_nr* stack = nullptr; ///< Stand-Alone RRC interface
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srsran::radio_interface_phy* radio = nullptr; ///< Radio object
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srslog::basic_logger& logger; ///< General PHY logger
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worker_pool& workers;
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// FSM that manages RRC commands for cell search/select/sync procedures
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std::mutex rrc_mutex;
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enum { PROC_IDLE = 0, PROC_SELECT_RUNNING, PROC_SEARCH_RUNNING } rrc_proc_state = PROC_IDLE;
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sync_state phy_state;
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std::atomic<bool> running = {false};
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cf_t* rx_buffer = nullptr;
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double srate_hz = 0; ///< Sampling rate in Hz
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uint32_t slot_sz = 0; ///< Subframe size (1-ms)
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uint32_t tti = 0;
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srsran::tti_semaphore<void*> tti_semaphore;
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srsran::rf_timestamp_t last_rx_time;
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std::atomic<bool> is_pending_tx_end = {false};
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uint32_t cell_search_nof_trials = 0;
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const static uint32_t cell_search_max_trials = 100;
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uint32_t sfn_sync_nof_trials = 0;
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const static uint32_t sfn_sync_max_trials = 100;
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cell_search::ret_t cs_ret;
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cell_search searcher;
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slot_sync slot_synchronizer;
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// FSM States
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bool wait_idle();
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void run_state_idle();
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void run_state_cell_search();
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void run_state_sfn_sync();
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void run_state_cell_camping();
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int radio_recv_fnc(srsran::rf_buffer_t& data, srsran_timestamp_t* rx_time);
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void run_stack_tti();
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void run_thread() override;
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};
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} // namespace nr
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} // namespace srsue
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#endif // SRSUE_SYNC_NR_SA_H
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