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srsLTE/srsue/hdr/stack/rrc/rrc_procedures.h

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/*
* Copyright 2013-2019 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 "srslte/common/log.h"
#include "srsue/hdr/stack/rrc/rrc.h"
#include <map>
#include <string>
#ifndef SRSLTE_RRC_PROCEDURES_H
#define SRSLTE_RRC_PROCEDURES_H
namespace srsue {
/********************************
* Events
*******************************/
// background workers use this event to signal the result of a cell select phy procedure
struct cell_select_event_t {
cell_select_event_t(bool c_) : cs_ret(c_) {}
bool cs_ret;
};
/********************************
* Procedures
*******************************/
class rrc::cell_search_proc
{
public:
struct cell_search_event_t {
phy_interface_rrc_lte::cell_search_ret_t cs_ret;
phy_interface_rrc_lte::phy_cell_t found_cell;
};
enum class state_t { phy_cell_search, si_acquire, wait_measurement, phy_cell_select };
explicit cell_search_proc(rrc* parent_);
srslte::proc_outcome_t init();
srslte::proc_outcome_t step();
srslte::proc_outcome_t step_si_acquire();
srslte::proc_outcome_t react(const cell_search_event_t& event);
srslte::proc_outcome_t react(const cell_select_event_t& event);
srslte::proc_outcome_t step_wait_measurement();
phy_interface_rrc_lte::cell_search_ret_t get_result() const { return search_result.cs_ret; }
static const char* name() { return "Cell Search"; }
private:
srslte::proc_outcome_t handle_cell_found(const phy_interface_rrc_lte::phy_cell_t& new_cell);
// conts
rrc* rrc_ptr;
// state vars
cell_search_event_t search_result;
srslte::proc_future_t<void> si_acquire_fut;
state_t state;
};
/****************************************************************
* TS 36.331 Sec 5.2.3 - Acquisition of an SI message procedure
***************************************************************/
class rrc::si_acquire_proc
{
public:
const static int SIB_SEARCH_TIMEOUT_MS = 1000;
struct si_acq_timer_expired {
uint32_t timer_id;
};
struct sib_received_ev {
};
explicit si_acquire_proc(rrc* parent_);
srslte::proc_outcome_t init(uint32_t sib_index_);
srslte::proc_outcome_t step() { return srslte::proc_outcome_t::yield; }
static const char* name() { return "SI Acquire"; }
srslte::proc_outcome_t react(si_acq_timer_expired ev);
srslte::proc_outcome_t react(sib_received_ev ev);
void then(const srslte::proc_state_t& result);
private:
void start_si_acquire();
// conts
rrc* rrc_ptr;
srslte::log* log_h;
// state
srslte::timer_handler::unique_timer si_acq_timeout, si_acq_retry_timer;
uint32_t period = 0, sched_index = 0;
uint32_t sib_index = 0;
};
class rrc::serving_cell_config_proc
{
public:
explicit serving_cell_config_proc(rrc* parent_);
srslte::proc_outcome_t init(const std::vector<uint32_t>& required_sibs_);
srslte::proc_outcome_t step();
static const char* name() { return "Serving Cell Configuration"; }
private:
rrc* rrc_ptr;
srslte::log* log_h;
srslte::proc_outcome_t launch_sib_acquire();
// proc args
std::vector<uint32_t> required_sibs;
// state variables
uint32_t req_idx = 0;
srslte::proc_future_t<void> si_acquire_fut;
};
class rrc::cell_selection_proc
{
public:
using cell_selection_complete_ev = srslte::proc_result_t<cs_result_t>;
explicit cell_selection_proc(rrc* parent_);
srslte::proc_outcome_t init();
srslte::proc_outcome_t step();
void then(const srslte::proc_result_t<cs_result_t>& proc_result) const;
cs_result_t get_result() const { return cs_result; }
static const char* name() { return "Cell Selection"; }
srslte::proc_outcome_t react(const cell_select_event_t& event);
private:
srslte::proc_outcome_t start_cell_selection();
srslte::proc_outcome_t step_cell_selection(const cell_select_event_t& event);
srslte::proc_outcome_t step_serv_cell_camp(const cell_select_event_t& event);
srslte::proc_outcome_t step_wait_in_sync();
srslte::proc_outcome_t step_cell_search();
srslte::proc_outcome_t step_cell_config();
// consts
rrc* rrc_ptr;
// state variables
enum class search_state_t { cell_selection, serv_cell_camp, wait_in_sync, cell_config, cell_search };
cs_result_t cs_result;
search_state_t state;
uint32_t neigh_index;
srslte::proc_future_t<phy_interface_rrc_lte::cell_search_ret_t> cell_search_fut;
srslte::proc_future_t<void> serv_cell_cfg_fut;
bool discard_serving = false;
};
class rrc::plmn_search_proc
{
public:
explicit plmn_search_proc(rrc* parent_);
srslte::proc_outcome_t init();
srslte::proc_outcome_t step();
void then(const srslte::proc_state_t& result) const;
static const char* name() { return "PLMN Search"; }
private:
// consts
rrc* rrc_ptr;
srslte::log* log_h;
// state variables
found_plmn_t found_plmns[MAX_FOUND_PLMNS];
int nof_plmns = 0;
srslte::proc_future_t<phy_interface_rrc_lte::cell_search_ret_t> cell_search_fut;
};
class rrc::connection_request_proc
{
public:
explicit connection_request_proc(rrc* parent_);
srslte::proc_outcome_t init(srslte::establishment_cause_t cause_, srslte::unique_byte_buffer_t dedicated_info_nas_);
srslte::proc_outcome_t step();
void then(const srslte::proc_state_t& result);
srslte::proc_outcome_t react(const cell_selection_proc::cell_selection_complete_ev& e);
static const char* name() { return "Connection Request"; }
private:
// const
rrc* rrc_ptr;
srslte::log* log_h;
// args
srslte::establishment_cause_t cause;
srslte::unique_byte_buffer_t dedicated_info_nas;
// state variables
enum class state_t { cell_selection, config_serving_cell, wait_t300 } state;
cs_result_t cs_ret;
srslte::proc_future_t<void> serv_cfg_fut;
};
class rrc::process_pcch_proc
{
public:
struct paging_complete {
bool outcome;
};
explicit process_pcch_proc(rrc* parent_);
srslte::proc_outcome_t init(const asn1::rrc::paging_s& paging_);
srslte::proc_outcome_t step();
srslte::proc_outcome_t react(paging_complete e);
static const char* name() { return "Process PCCH"; }
private:
// args
rrc* rrc_ptr;
srslte::log* log_h;
asn1::rrc::paging_s paging;
// vars
uint32_t paging_idx = 0;
enum class state_t { next_record, nas_paging, serv_cell_cfg } state;
srslte::proc_future_t<void> serv_cfg_fut;
};
class rrc::go_idle_proc
{
public:
explicit go_idle_proc(rrc* rrc_);
srslte::proc_outcome_t init();
srslte::proc_outcome_t step();
static const char* name() { return "Go Idle"; }
private:
bool wait = false;
rrc* rrc_ptr;
static const uint32_t rlc_flush_timeout = 2000;
uint32_t rlc_flush_counter;
};
class rrc::cell_reselection_proc
{
public:
cell_reselection_proc(rrc* rrc_);
srslte::proc_outcome_t init();
srslte::proc_outcome_t step();
static const char* name() { return "Cell Reselection"; }
private:
rrc* rrc_ptr;
srslte::proc_future_t<cs_result_t> cell_selection_fut;
};
class rrc::connection_reest_proc
{
public:
explicit connection_reest_proc(rrc* rrc_);
srslte::proc_outcome_t init(asn1::rrc::reest_cause_e cause);
srslte::proc_outcome_t step();
static const char* name() { return "Connection re-establishment"; }
uint32_t get_source_earfcn() const { return reest_source_freq; }
private:
enum class state_t { cell_reselection, cell_configuration } state;
rrc* rrc_ptr = nullptr;
asn1::rrc::reest_cause_e reest_cause = asn1::rrc::reest_cause_e::nulltype;
uint16_t reest_rnti = 0;
uint16_t reest_source_pci = 0;
uint32_t reest_source_freq = 0;
srslte::proc_outcome_t step_cell_reselection();
srslte::proc_outcome_t step_cell_configuration();
srslte::proc_outcome_t cell_criteria();
};
} // namespace srsue
#endif // SRSLTE_RRC_PROCEDURES_H
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