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186 lines
8.5 KiB
C++
186 lines
8.5 KiB
C++
/*
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* Copyright 2013-2020 Software Radio Systems Limited
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*
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* This file is part of srsLTE.
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*
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* srsLTE 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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* srsLTE 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 SRSENB_RRC_MOBILITY_H
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#define SRSENB_RRC_MOBILITY_H
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#include "rrc.h"
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#include "rrc_ue.h"
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#include "srslte/common/fsm.h"
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#include "srslte/common/logmap.h"
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#include <map>
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namespace srsenb {
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enum class ho_interface_t { S1, X2, intra_enb };
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class rrc::ue::rrc_mobility : public srslte::fsm_t<rrc::ue::rrc_mobility>
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{
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public:
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// public events
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struct user_crnti_upd_ev {
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uint16_t crnti;
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uint16_t temp_crnti;
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};
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struct ho_cancel_ev {};
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explicit rrc_mobility(srsenb::rrc::ue* outer_ue);
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bool fill_conn_recfg_no_ho_cmd(asn1::rrc::rrc_conn_recfg_r8_ies_s* conn_recfg);
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void handle_ue_meas_report(const asn1::rrc::meas_report_s& msg);
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void handle_ho_preparation_complete(bool is_success, srslte::unique_byte_buffer_t container);
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bool is_ho_running() const { return not is_in_state<idle_st>(); }
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// S1-Handover
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bool start_s1_tenb_ho(const asn1::s1ap::ho_request_s& msg,
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const asn1::s1ap::sourceenb_to_targetenb_transparent_container_s& container);
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static uint16_t
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start_ho_ue_resource_alloc(const asn1::s1ap::ho_request_s& msg,
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const asn1::s1ap::sourceenb_to_targetenb_transparent_container_s& container);
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private:
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// helper methods
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bool update_ue_var_meas_cfg(uint32_t src_earfcn,
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const enb_cell_common& target_pcell,
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asn1::rrc::meas_cfg_s* diff_meas_cfg);
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// Handover from source cell
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bool start_ho_preparation(uint32_t target_eci, uint8_t measobj_id, bool fwd_direct_path_available);
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bool start_enb_status_transfer();
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// Handover to target cell
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void fill_mobility_reconf_common(asn1::rrc::dl_dcch_msg_s& msg,
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const enb_cell_common& target_cell,
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uint32_t src_dl_earfcn,
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uint32_t src_pci);
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bool apply_ho_prep_cfg(const asn1::rrc::ho_prep_info_r8_ies_s& ho_prep, const asn1::s1ap::ho_request_s& ho_req_msg);
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rrc::ue* rrc_ue = nullptr;
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rrc* rrc_enb = nullptr;
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srslte::byte_buffer_pool* pool = nullptr;
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srslte::log_ref rrc_log;
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// vars
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asn1::rrc::meas_cfg_s current_meas_cfg;
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asn1::rrc::rrc_conn_recfg_complete_s pending_recfg_complete;
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// events
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struct ho_meas_report_ev {
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uint32_t target_eci = 0;
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const asn1::rrc::meas_obj_to_add_mod_s* meas_obj = nullptr;
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};
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struct ho_req_rx_ev {
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const asn1::s1ap::ho_request_s* ho_req_msg;
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const asn1::s1ap::sourceenb_to_targetenb_transparent_container_s* transparent_container;
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};
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using unsuccessful_outcome_ev = std::false_type;
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using recfg_complete_ev = asn1::rrc::rrc_conn_recfg_complete_s;
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using status_transfer_ev = asn1::s1ap::bearers_subject_to_status_transfer_list_l;
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// states
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struct idle_st {};
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struct intraenb_ho_st {
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const enb_cell_common* target_cell = nullptr;
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const enb_cell_common* source_cell = nullptr;
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uint16_t last_temp_crnti = SRSLTE_INVALID_RNTI;
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void enter(rrc_mobility* f, const ho_meas_report_ev& meas_report);
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};
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struct s1_target_ho_st {};
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struct wait_recfg_comp {};
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struct s1_source_ho_st : public subfsm_t<s1_source_ho_st> {
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ho_meas_report_ev report;
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using ho_cmd_msg = asn1::rrc::ho_cmd_r8_ies_s;
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struct wait_ho_req_ack_st {
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void enter(s1_source_ho_st* f, const ho_meas_report_ev& ev);
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};
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struct status_transfer_st {
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void enter(s1_source_ho_st* f);
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};
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explicit s1_source_ho_st(rrc_mobility* parent_) : base_t(parent_) {}
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private:
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void send_ho_cmd(wait_ho_req_ack_st& s, const ho_cmd_msg& ho_cmd);
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void handle_ho_cancel(const ho_cancel_ev& ev);
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protected:
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using fsm = s1_source_ho_st;
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state_list<wait_ho_req_ack_st, status_transfer_st> states{this};
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// clang-format off
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using transitions = transition_table<
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// Start Target Event Action Guard
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// +-------------------+------------------+---------------------+-----------------------+---------------------+
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to_state< idle_st, srslte::failure_ev >,
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to_state< idle_st, ho_cancel_ev, &fsm::handle_ho_cancel >,
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row< wait_ho_req_ack_st, status_transfer_st, ho_cmd_msg, &fsm::send_ho_cmd >
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// +-------------------+------------------+---------------------+-----------------------+---------------------+
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>;
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// clang-format on
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};
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// FSM guards
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bool needs_s1_ho(idle_st& s, const ho_meas_report_ev& meas_report);
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bool needs_intraenb_ho(idle_st& s, const ho_meas_report_ev& meas_report);
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// FSM transition handlers
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void handle_crnti_ce(intraenb_ho_st& s, const user_crnti_upd_ev& ev);
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void handle_recfg_complete(intraenb_ho_st& s, const recfg_complete_ev& ev);
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void handle_ho_req(idle_st& s, const ho_req_rx_ev& ho_req);
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void handle_status_transfer(s1_target_ho_st& s, const status_transfer_ev& ev);
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void defer_recfg_complete(s1_target_ho_st& s, const recfg_complete_ev& ev);
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void handle_recfg_complete(wait_recfg_comp& s, const recfg_complete_ev& ev);
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protected:
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// states
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state_list<idle_st, intraenb_ho_st, s1_target_ho_st, wait_recfg_comp, s1_source_ho_st> states{this,
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idle_st{},
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intraenb_ho_st{},
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s1_target_ho_st{},
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wait_recfg_comp{},
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s1_source_ho_st{this}};
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// transitions
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using fsm = rrc_mobility;
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// clang-format off
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using transitions = transition_table<
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// Start Target Event Action Guard
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// +----------------+-------------------+---------------------+----------------------------+-------------------------+
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row< idle_st, s1_source_ho_st, ho_meas_report_ev, nullptr, &fsm::needs_s1_ho >,
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row< idle_st, intraenb_ho_st, ho_meas_report_ev, nullptr, &fsm::needs_intraenb_ho >,
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row< idle_st, s1_target_ho_st, ho_req_rx_ev, &fsm::handle_ho_req >,
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// +----------------+-------------------+---------------------+----------------------------+-------------------------+
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upd< intraenb_ho_st, user_crnti_upd_ev, &fsm::handle_crnti_ce >,
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row< intraenb_ho_st, idle_st, recfg_complete_ev, &fsm::handle_recfg_complete >,
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// +----------------+-------------------+---------------------+----------------------------+-------------------------+
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row< s1_target_ho_st, wait_recfg_comp, status_transfer_ev, &fsm::handle_status_transfer >,
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upd< s1_target_ho_st, recfg_complete_ev, &fsm::defer_recfg_complete >,
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row< wait_recfg_comp, idle_st, recfg_complete_ev, &fsm::handle_recfg_complete >
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// +----------------+-------------------+---------------------+----------------------------+-------------------------+
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>;
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// clang-format on
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};
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} // namespace srsenb
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#endif // SRSENB_RRC_MOBILITY_H
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