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199 lines
5.7 KiB
C++
199 lines
5.7 KiB
C++
/*
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* Copyright 2013-2019 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 SRSUE_PROC_RA_H
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#define SRSUE_PROC_RA_H
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#include <stdint.h>
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#include "srslte/common/log.h"
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#include "srslte/common/timers.h"
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#include "mux.h"
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#include "demux.h"
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#include "srslte/common/pdu.h"
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#include "srslte/common/mac_pcap.h"
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/* Random access procedure as specified in Section 5.1 of 36.321 */
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namespace srsue {
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class ra_proc : public srslte::timer_callback
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{
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public:
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ra_proc() : rar_pdu_msg(20) {
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bzero(&softbuffer_rar, sizeof(srslte_softbuffer_rx_t));
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pcap = NULL;
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backoff_interval_start = 0;
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backoff_inteval = 0;
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received_target_power_dbm = 0;
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ra_rnti = 0;
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current_ta = 0;
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state = IDLE;
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last_msg3_group = RA_GROUP_A;
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msg3_transmitted = false;
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first_rar_received = false;
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phy_h = NULL;
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log_h = NULL;
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mux_unit = NULL;
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rrc = NULL;
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transmitted_contention_id = 0;
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transmitted_crnti = 0;
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pdcch_to_crnti_received = PDCCH_CRNTI_NOT_RECEIVED;
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started_by_pdcch = false;
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rar_grant_nbytes = 0;
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msg3_flushed = false;
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noncontention_enabled = false;
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next_preamble_idx = 0;
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next_prach_mask = 0;
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time_alignment_timer = NULL;
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contention_resolution_timer = NULL;
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};
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~ra_proc();
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void init(phy_interface_mac_lte* phy_h,
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rrc_interface_mac* rrc_,
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srslte::log* log_h,
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mac_interface_rrc::ue_rnti_t* rntis,
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srslte::timers::timer* time_alignment_timer_,
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srslte::timers::timer* contention_resolution_timer_,
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mux* mux_unit);
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void reset();
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void set_config(mac_interface_rrc::rach_cfg_t& rach_cfg);
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void start_pdcch_order();
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void start_mac_order(uint32_t msg_len_bits = 56, bool is_ho = false);
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void step(uint32_t tti);
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bool is_rar_window(int* rar_window_start, int* rar_window_length);
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bool is_contention_resolution();
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void harq_retx();
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void harq_max_retx();
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void pdcch_to_crnti(bool contains_uplink_grant);
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void timer_expired(uint32_t timer_id);
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void new_grant_dl(mac_interface_phy_lte::mac_grant_dl_t grant, mac_interface_phy_lte::tb_action_dl_t* action);
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void tb_decoded_ok();
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void start_noncont(uint32_t preamble_index, uint32_t prach_mask);
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bool contention_resolution_id_received(uint64_t uecri);
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void start_pcap(srslte::mac_pcap* pcap);
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private:
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void process_timeadv_cmd(uint32_t ta_cmd);
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void step_initialization();
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void step_resource_selection();
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void step_preamble_transmission();
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void step_pdcch_setup();
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void step_response_reception(uint32_t tti);
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void step_response_error(uint32_t tti);
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void step_backoff_wait(uint32_t tti);
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void step_contention_resolution();
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void step_completition();
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// Buffer to receive RAR PDU
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static const uint32_t MAX_RAR_PDU_LEN = 2048;
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uint8_t rar_pdu_buffer[MAX_RAR_PDU_LEN];
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srslte::rar_pdu rar_pdu_msg;
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// Random Access parameters provided by higher layers defined in 5.1.1
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mac_interface_rrc::rach_cfg_t rach_cfg, new_cfg;
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int delta_preamble_db;
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uint32_t maskIndex;
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int preambleIndex;
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uint32_t new_ra_msg_len;
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bool noncontention_enabled;
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uint32_t next_preamble_idx;
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uint32_t next_prach_mask;
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// Internal variables
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uint32_t preambleTransmissionCounter;
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uint32_t backoff_param_ms;
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uint32_t sel_maskIndex;
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uint32_t sel_preamble;
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uint32_t backoff_interval_start;
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uint32_t backoff_inteval;
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int received_target_power_dbm;
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uint32_t ra_rnti;
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uint32_t current_ta;
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srslte_softbuffer_rx_t softbuffer_rar;
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enum {
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IDLE = 0,
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INITIALIZATION, // Section 5.1.1
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RESOURCE_SELECTION, // Section 5.1.2
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PREAMBLE_TRANSMISSION, // Section 5.1.3
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PDCCH_SETUP,
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RESPONSE_RECEPTION, // Section 5.1.4
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RESPONSE_ERROR,
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BACKOFF_WAIT,
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CONTENTION_RESOLUTION, // Section 5.1.5
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COMPLETION, // Section 5.1.6
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COMPLETION_DONE,
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RA_PROBLEM // Section 5.1.5 last part
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} state;
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typedef enum { RA_GROUP_A, RA_GROUP_B } ra_group_t;
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ra_group_t last_msg3_group;
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bool msg3_transmitted;
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bool first_rar_received;
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uint32_t rar_window_st;
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void read_params();
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phy_interface_mac_lte* phy_h;
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srslte::log* log_h;
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mux *mux_unit;
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srslte::mac_pcap *pcap;
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rrc_interface_mac *rrc;
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srslte::timers::timer *time_alignment_timer;
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srslte::timers::timer *contention_resolution_timer;
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mac_interface_rrc::ue_rnti_t *rntis;
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uint64_t transmitted_contention_id;
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uint16_t transmitted_crnti;
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pthread_mutex_t mutex;
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enum { PDCCH_CRNTI_NOT_RECEIVED = 0, PDCCH_CRNTI_UL_GRANT, PDCCH_CRNTI_DL_GRANT } pdcch_to_crnti_received;
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bool ra_is_ho;
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bool started_by_pdcch;
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uint32_t rar_grant_nbytes;
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bool msg3_flushed;
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bool rar_received;
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};
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} // namespace srsue
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#endif // SRSUE_PROC_RA_H
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