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/**
* Copyright 2013-2021 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/.
*
*/
#ifndef SRSUE_PROC_RA_NR_H
#define SRSUE_PROC_RA_NR_H
#include <atomic>
#include <mutex>
#include <stdint.h>
#include "mac_nr_interfaces.h"
#include "srsran/common/common.h"
#include "srsran/common/task_scheduler.h"
#include "srsran/interfaces/ue_nr_interfaces.h"
#include "srsran/srslog/srslog.h"
namespace srsue {
class proc_ra_nr
{
public:
proc_ra_nr(mac_interface_proc_ra_nr& mac_, srslog::basic_logger& logger_);
~proc_ra_nr(){};
void init(phy_interface_mac_nr* phy_h_, srsran::ext_task_sched_handle* task_sched_);
void set_config(const srsran::rach_nr_cfg_t& rach_cfg);
bool is_contention_resolution();
bool is_rar_opportunity(uint32_t tti);
bool has_rar_rnti();
uint16_t get_rar_rnti();
bool has_temp_crnti();
uint16_t get_temp_crnti();
// PHY interfaces
void prach_sent(uint32_t tti, uint32_t s_id, uint32_t t_id, uint32_t f_id, uint32_t ul_carrier_id);
void handle_rar_pdu(mac_interface_phy_nr::tb_action_dl_result_t& grant);
void pdcch_to_crnti();
void start_by_rrc();
void start_by_mac();
void reset();
private:
static const uint32_t PRACH_SEND_CALLBACK_TIMEOUT =
16 * 10; ///< Limited from frame system number opportunity period in TS 38.211 tables 6.3.3.2-2, 6.3.3.2-3
///< and 6.3.3.2-4
mac_interface_proc_ra_nr& mac;
srslog::basic_logger& logger;
phy_interface_mac_nr* phy = nullptr;
srsran::ext_task_sched_handle* task_sched = nullptr;
srsran::task_multiqueue::queue_handle task_queue;
int ra_window_length = -1, ra_window_start = -1;
uint16_t rar_rnti = SRSRAN_INVALID_RNTI;
uint16_t temp_crnti = SRSRAN_INVALID_RNTI;
srsran::rach_nr_cfg_t rach_cfg = {};
bool configured = false;
enum ra_state_t {
IDLE = 0,
PDCCH_SETUP,
WAITING_FOR_PRACH_SENT,
WAITING_FOR_RESPONSE_RECEPTION,
WAITING_FOR_CONTENTION_RESOLUTION,
WAITING_FOR_COMPLETION,
MAX_RA_STATES,
};
std::atomic<ra_state_t> state = {IDLE};
enum initiators_t { MAC, RRC, initiators_t_NULLTYPE };
std::atomic<initiators_t> started_by = {initiators_t_NULLTYPE};
srsran::timer_handler::unique_timer prach_send_timer;
srsran::timer_handler::unique_timer rar_timeout_timer;
srsran::timer_handler::unique_timer contention_resolution_timer;
srsran::timer_handler::unique_timer backoff_timer;
// 38.321 5.1.1 Variables
uint32_t preamble_index = 0;
uint32_t preamble_transmission_counter = 0;
uint32_t preamble_backoff = 0; // in ms
uint32_t preamble_power_ramping_step = 0;
int preamble_received_target_power = 0;
uint32_t scaling_factor_bi = 0;
// uint32_t temporary_c_rnti;
uint32_t power_offset_2step_ra = 0;
// not explicty mentioned
uint32_t preambleTransMax = 0;
uint32_t prach_occasion = 0;
uint32_t current_ta = 0;
void timer_expired(uint32_t timer_id);
// 38.321 Steps 5.1.1 - 5.1.6
void ra_procedure_initialization();
void ra_resource_selection();
void ra_preamble_transmission();
void ra_response_reception(const mac_interface_phy_nr::tb_action_dl_result_t& tb);
void ra_contention_resolution();
void ra_contention_resolution(uint64_t rx_contention_id);
void ra_completion();
void ra_error();
};
} // namespace srsue
#endif