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srsRAN_4G/srsenb/hdr/stack/rrc/rrc.h

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/*
* Copyright 2013-2020 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/.
*
*/
#ifndef SRSENB_RRC_H
#define SRSENB_RRC_H
#include "rrc_cell_cfg.h"
#include "rrc_metrics.h"
#include "srsenb/hdr/stack/upper/common_enb.h"
#include "srslte/common/block_queue.h"
#include "srslte/common/buffer_pool.h"
#include "srslte/common/common.h"
#include "srslte/common/logmap.h"
#include "srslte/common/stack_procedure.h"
#include "srslte/common/timeout.h"
#include "srslte/interfaces/enb_interfaces.h"
#include <map>
#include <queue>
namespace srsenb {
static const char rrc_state_text[RRC_STATE_N_ITEMS][100] = {"IDLE",
"WAIT FOR CON SETUP COMPLETE",
"WAIT FOR SECURITY MODE COMPLETE",
"WAIT FOR UE CAPABILITIY INFORMATION",
"WAIT FOR CON RECONF COMPLETE",
"RRC CONNECTED",
"RELEASE REQUEST"};
class rrc final : public rrc_interface_pdcp,
public rrc_interface_mac,
public rrc_interface_rlc,
public rrc_interface_s1ap
{
public:
rrc();
~rrc();
void init(const rrc_cfg_t& cfg_,
phy_interface_rrc_lte* phy,
mac_interface_rrc* mac,
rlc_interface_rrc* rlc,
pdcp_interface_rrc* pdcp,
s1ap_interface_rrc* s1ap,
gtpu_interface_rrc* gtpu,
srslte::timer_handler* timers_);
void stop();
void get_metrics(rrc_metrics_t& m);
void tti_clock();
// rrc_interface_mac
void rl_failure(uint16_t rnti) override;
void add_user(uint16_t rnti, const sched_interface::ue_cfg_t& init_ue_cfg) override;
void upd_user(uint16_t new_rnti, uint16_t old_rnti) override;
void set_activity_user(uint16_t rnti) override;
bool is_paging_opportunity(uint32_t tti, uint32_t* payload_len) override;
uint8_t* read_pdu_bcch_dlsch(const uint8_t cc_idx, const uint32_t sib_index) override;
// rrc_interface_rlc
void read_pdu_pcch(uint8_t* payload, uint32_t buffer_size) override;
void max_retx_attempted(uint16_t rnti) override;
// rrc_interface_s1ap
void write_dl_info(uint16_t rnti, srslte::unique_byte_buffer_t sdu) override;
void release_complete(uint16_t rnti) override;
bool setup_ue_ctxt(uint16_t rnti, const asn1::s1ap::init_context_setup_request_s& msg) override;
bool modify_ue_ctxt(uint16_t rnti, const asn1::s1ap::ue_context_mod_request_s& msg) override;
bool setup_ue_erabs(uint16_t rnti, const asn1::s1ap::erab_setup_request_s& msg) override;
bool release_erabs(uint32_t rnti) override;
void add_paging_id(uint32_t ueid, const asn1::s1ap::ue_paging_id_c& UEPagingID) override;
void ho_preparation_complete(uint16_t rnti, bool is_success, srslte::unique_byte_buffer_t rrc_container) override;
// rrc_interface_pdcp
void write_pdu(uint16_t rnti, uint32_t lcid, srslte::unique_byte_buffer_t pdu) override;
uint32_t get_nof_users();
// logging
typedef enum { Rx = 0, Tx } direction_t;
template <class T>
void log_rrc_message(const std::string& source,
direction_t dir,
const srslte::byte_buffer_t* pdu,
const T& msg,
const std::string& msg_type);
private:
class ue
{
public:
class rrc_mobility;
ue(rrc* outer_rrc, uint16_t rnti, const sched_interface::ue_cfg_t& ue_cfg);
~ue();
bool is_connected();
bool is_idle();
typedef enum {
MSG3_RX_TIMEOUT = 0, ///< Msg3 has its own timeout to quickly remove fake UEs from random PRACHs
UE_RESPONSE_RX_TIMEOUT, ///< General purpose timeout for responses to eNB requests
UE_INACTIVITY_TIMEOUT, ///< UE inactivity timeout
nulltype
} activity_timeout_type_t;
std::string to_string(const activity_timeout_type_t& type);
void set_activity_timeout(const activity_timeout_type_t type);
void set_activity();
void activity_timer_expired();
uint32_t rl_failure();
rrc_state_t get_state();
void send_connection_setup(bool is_setup = true);
void send_connection_reest();
void send_connection_reject();
void send_connection_release();
void send_connection_reest_rej();
void send_connection_reconf(srslte::unique_byte_buffer_t sdu);
void send_connection_reconf_new_bearer(const asn1::s1ap::erab_to_be_setup_list_bearer_su_req_l& e);
void send_connection_reconf_upd(srslte::unique_byte_buffer_t pdu);
void send_security_mode_command();
void send_ue_cap_enquiry();
void parse_ul_dcch(uint32_t lcid, srslte::unique_byte_buffer_t pdu);
void handle_rrc_con_req(asn1::rrc::rrc_conn_request_s* msg);
void handle_rrc_con_reest_req(asn1::rrc::rrc_conn_reest_request_r8_ies_s* msg);
void handle_rrc_con_setup_complete(asn1::rrc::rrc_conn_setup_complete_s* msg, srslte::unique_byte_buffer_t pdu);
void handle_rrc_reconf_complete(asn1::rrc::rrc_conn_recfg_complete_s* msg, srslte::unique_byte_buffer_t pdu);
void handle_security_mode_complete(asn1::rrc::security_mode_complete_s* msg);
void handle_security_mode_failure(asn1::rrc::security_mode_fail_s* msg);
bool handle_ue_cap_info(asn1::rrc::ue_cap_info_s* msg);
void set_bitrates(const asn1::s1ap::ue_aggregate_maximum_bitrate_s& rates);
void set_security_capabilities(const asn1::s1ap::ue_security_cap_s& caps);
void set_security_key(const asn1::fixed_bitstring<256, false, true>& key);
bool setup_erabs(const asn1::s1ap::erab_to_be_setup_list_ctxt_su_req_l& e);
bool setup_erabs(const asn1::s1ap::erab_to_be_setup_list_bearer_su_req_l& e);
void setup_erab(uint8_t id,
const asn1::s1ap::erab_level_qos_params_s& qos,
const asn1::bounded_bitstring<1, 160, true, true>& addr,
uint32_t teid_out,
const asn1::unbounded_octstring<true>* nas_pdu);
bool release_erabs();
// handover
void handle_ho_preparation_complete(bool is_success, srslte::unique_byte_buffer_t container);
void notify_s1ap_ue_ctxt_setup_complete();
void notify_s1ap_ue_erab_setup_response(const asn1::s1ap::erab_to_be_setup_list_bearer_su_req_l& e);
// Getters for PUCCH resources
int get_cqi(uint16_t* pmi_idx, uint16_t* n_pucch, uint32_t ue_cc_idx);
int get_ri(uint32_t m_ri, uint16_t* ri_idx);
bool is_allocated() const;
bool select_security_algorithms();
void send_dl_ccch(asn1::rrc::dl_ccch_msg_s* dl_ccch_msg);
bool send_dl_dcch(const asn1::rrc::dl_dcch_msg_s* dl_dcch_msg,
srslte::unique_byte_buffer_t pdu = srslte::unique_byte_buffer_t());
uint16_t rnti = 0;
rrc* parent = nullptr;
bool connect_notified = false;
std::unique_ptr<rrc_mobility> mobility_handler;
bool is_csfb = false;
private:
// args
srslte::byte_buffer_pool* pool = nullptr;
srslte::timer_handler::unique_timer activity_timer;
// cached for ease of context transfer
asn1::rrc::rrc_conn_recfg_s last_rrc_conn_recfg;
asn1::rrc::security_algorithm_cfg_s last_security_mode_cmd;
asn1::rrc::establishment_cause_e establishment_cause;
// S-TMSI for this UE
bool has_tmsi = false;
uint32_t m_tmsi = 0;
uint8_t mmec = 0;
// state
sched_interface::ue_cfg_t current_sched_ue_cfg = {};
uint32_t rlf_cnt = 0;
uint8_t transaction_id = 0;
rrc_state_t state = RRC_STATE_IDLE;
std::map<uint32_t, asn1::rrc::srb_to_add_mod_s> srbs;
std::map<uint32_t, asn1::rrc::drb_to_add_mod_s> drbs;
uint8_t k_enb[32]; // Provided by MME
srslte::as_security_config_t sec_cfg = {};
asn1::s1ap::ue_aggregate_maximum_bitrate_s bitrates;
asn1::s1ap::ue_security_cap_s security_capabilities;
bool eutra_capabilities_unpacked = false;
asn1::rrc::ue_eutra_cap_s eutra_capabilities;
srslte::rrc_ue_capabilities_t ue_capabilities;
struct erab_t {
uint8_t id;
asn1::s1ap::erab_level_qos_params_s qos_params;
asn1::bounded_bitstring<1, 160, true, true> address;
uint32_t teid_out;
uint32_t teid_in;
};
std::map<uint8_t, erab_t> erabs;
std::map<uint8_t, srslte::unique_byte_buffer_t> erab_info_list;
const static uint32_t UE_PCELL_CC_IDX = 0;
cell_ctxt_dedicated_list cell_ded_list;
int get_drbid_config(asn1::rrc::drb_to_add_mod_s* drb, int drbid);
///< Helper to access a cell cfg based on ue_cc_idx
cell_info_common* get_ue_cc_cfg(uint32_t ue_cc_idx);
///< Helper to fill SCell struct for RRR Connection Reconfig
int fill_scell_to_addmod_list(asn1::rrc::rrc_conn_recfg_r8_ies_s* conn_reconf);
///< UE's Physical layer dedicated configuration
phy_interface_rrc_lte::phy_rrc_dedicated_list_t phy_rrc_dedicated_list = {};
/**
* Setups the PCell physical layer common configuration of the UE from the SIB2 message. This methods is designed to
* be called from the constructor.
*
* @param config ASN1 Common SIB struct carrying the common physical layer parameters
*/
void apply_setup_phy_common(const asn1::rrc::rr_cfg_common_sib_s& config);
/**
* Setups the PCell physical layer dedicated configuration of the UE. This method shall be called from the
* connection setup only.
*
* @param phys_cfg_ded ASN1 Physical layer configuration dedicated
*/
void apply_setup_phy_config_dedicated(const asn1::rrc::phys_cfg_ded_s& phys_cfg_ded);
/**
* Reconfigures the PCell and SCell physical layer dedicated configuration of the UE. This method shall be called
* from the connection reconfiguration. `apply_setup_phy_config` shall not be called before/after. It automatically
* parses the PCell and SCell reconfiguration.
*
* @param reconfig_r8 ASN1 reconfiguration message
*/
void apply_reconf_phy_config(const asn1::rrc::rrc_conn_recfg_r8_ies_s& reconfig_r8);
}; // class ue
// args
srslte::timer_handler* timers = nullptr;
srslte::byte_buffer_pool* pool = nullptr;
phy_interface_rrc_lte* phy = nullptr;
mac_interface_rrc* mac = nullptr;
rlc_interface_rrc* rlc = nullptr;
pdcp_interface_rrc* pdcp = nullptr;
gtpu_interface_rrc* gtpu = nullptr;
s1ap_interface_rrc* s1ap = nullptr;
srslte::log_ref rrc_log;
// derived params
std::unique_ptr<cell_info_common_list> cell_common_list;
// state
std::unique_ptr<freq_res_common_list> pucch_res_list;
std::map<uint16_t, std::unique_ptr<ue> > users; // NOTE: has to have fixed addr
std::map<uint32_t, asn1::rrc::paging_record_s> pending_paging;
void process_release_complete(uint16_t rnti);
void process_rl_failure(uint16_t rnti);
void rem_user(uint16_t rnti);
uint32_t generate_sibs();
void configure_mbsfn_sibs(asn1::rrc::sib_type2_s* sib2, asn1::rrc::sib_type13_r9_s* sib13);
void config_mac();
void parse_ul_dcch(uint16_t rnti, uint32_t lcid, srslte::unique_byte_buffer_t pdu);
void parse_ul_ccch(uint16_t rnti, srslte::unique_byte_buffer_t pdu);
void configure_security(uint16_t rnti, uint32_t lcid, srslte::as_security_config_t sec_cfg);
void enable_integrity(uint16_t rnti, uint32_t lcid);
void enable_encryption(uint16_t rnti, uint32_t lcid);
srslte::byte_buffer_t byte_buf_paging;
typedef struct {
uint16_t rnti;
uint32_t lcid;
srslte::unique_byte_buffer_t pdu;
} rrc_pdu;
const static uint32_t LCID_EXIT = 0xffff0000;
const static uint32_t LCID_REM_USER = 0xffff0001;
const static uint32_t LCID_REL_USER = 0xffff0002;
const static uint32_t LCID_RLF_USER = 0xffff0003;
const static uint32_t LCID_ACT_USER = 0xffff0004;
bool running = false;
static const int RRC_THREAD_PRIO = 65;
srslte::block_queue<rrc_pdu> rx_pdu_queue;
asn1::rrc::mcch_msg_s mcch;
bool enable_mbms = false;
rrc_cfg_t cfg = {};
uint32_t nof_si_messages = 0;
asn1::rrc::sib_type7_s sib7;
class enb_mobility_handler;
std::unique_ptr<enb_mobility_handler> enb_mobility_cfg;
void rem_user_thread(uint16_t rnti);
std::mutex paging_mutex;
};
} // namespace srsenb
#endif // SRSENB_RRC_H
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