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srsRAN_4G/srsue/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 SRSUE_RRC_H
#define SRSUE_RRC_H
#include "rrc_common.h"
#include "rrc_metrics.h"
#include "srslte/asn1/rrc_asn1.h"
#include "srslte/asn1/rrc_asn1_utils.h"
#include "srslte/common/bcd_helpers.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/security.h"
#include "srslte/common/stack_procedure.h"
#include "srslte/interfaces/ue_interfaces.h"
#include <map>
#include <math.h>
#include <queue>
#define SRSLTE_RRC_N_BANDS 43
typedef struct {
std::string ue_category_str;
uint32_t ue_category;
int ue_category_ul;
int ue_category_dl;
uint32_t release;
uint32_t feature_group;
uint8_t supported_bands[SRSLTE_RRC_N_BANDS];
uint32_t nof_supported_bands;
bool support_ca;
int mbms_service_id;
uint32_t mbms_service_port;
} rrc_args_t;
#define SRSLTE_UE_CATEGORY_DEFAULT "4"
#define SRSLTE_UE_CATEGORY_MIN 1
#define SRSLTE_UE_CATEGORY_MAX 21
#define SRSLTE_RELEASE_DEFAULT 8
#define SRSLTE_RELEASE_MIN 8
#define SRSLTE_RELEASE_MAX 15
using srslte::byte_buffer_t;
namespace srsue {
class cell_t
{
public:
bool is_valid() { return phy_cell.earfcn != 0 && srslte_cellid_isvalid(phy_cell.pci); }
bool equals(cell_t* x) { return equals(x->phy_cell.earfcn, x->phy_cell.pci); }
bool equals(uint32_t earfcn, uint32_t pci) { return earfcn == phy_cell.earfcn && pci == phy_cell.pci; }
// NaN means an RSRP value has not yet been obtained. Keep then in the list and clean them if never updated
bool greater(cell_t* x) { return rsrp > x->rsrp || std::isnan(rsrp); }
bool plmn_equals(asn1::rrc::plmn_id_s plmn_id)
{
if (has_valid_sib1) {
for (uint32_t i = 0; i < sib1.cell_access_related_info.plmn_id_list.size(); i++) {
if (plmn_id.mcc == sib1.cell_access_related_info.plmn_id_list[i].plmn_id.mcc &&
plmn_id.mnc == sib1.cell_access_related_info.plmn_id_list[i].plmn_id.mnc) {
return true;
}
}
}
return false;
}
uint32_t nof_plmns()
{
if (has_valid_sib1) {
return sib1.cell_access_related_info.plmn_id_list.size();
} else {
return 0;
}
}
srslte::plmn_id_t get_plmn(uint32_t idx)
{
if (idx < sib1.cell_access_related_info.plmn_id_list.size() && has_valid_sib1) {
return srslte::make_plmn_id_t(sib1.cell_access_related_info.plmn_id_list[idx].plmn_id);
} else {
return {};
}
}
uint16_t get_tac()
{
if (has_valid_sib1) {
return (uint16_t)sib1.cell_access_related_info.tac.to_number();
} else {
return 0;
}
}
cell_t() { cell_t({0, 0}); }
cell_t(phy_interface_rrc_lte::phy_cell_t phy_cell_)
{
gettimeofday(&last_update, nullptr);
has_valid_sib1 = false;
has_valid_sib2 = false;
has_valid_sib3 = false;
has_valid_sib13 = false;
phy_cell = phy_cell_;
rsrp = NAN;
rsrq = NAN;
sib1 = {};
sib2 = {};
sib3 = {};
sib13 = {};
}
uint32_t get_earfcn() { return phy_cell.earfcn; }
uint32_t get_pci() { return phy_cell.pci; }
void set_rsrp(float rsrp_)
{
if (!std::isnan(rsrp_)) {
rsrp = rsrp_;
}
gettimeofday(&last_update, nullptr);
}
void set_rsrq(float rsrq_)
{
if (!std::isnan(rsrq_)) {
rsrq = rsrq_;
}
}
float get_rsrp() { return rsrp; }
float get_rsrq() { return rsrq; }
void set_sib1(asn1::rrc::sib_type1_s* sib1_);
void set_sib2(asn1::rrc::sib_type2_s* sib2_);
void set_sib3(asn1::rrc::sib_type3_s* sib3_);
void set_sib13(asn1::rrc::sib_type13_r9_s* sib13_);
// TODO: replace with TTI count
uint32_t timeout_secs(struct timeval now)
{
struct timeval t[3];
memcpy(&t[2], &now, sizeof(struct timeval));
memcpy(&t[1], &last_update, sizeof(struct timeval));
get_time_interval(t);
return t[0].tv_sec;
}
asn1::rrc::sib_type1_s* sib1ptr() { return &sib1; }
asn1::rrc::sib_type2_s* sib2ptr() { return &sib2; }
asn1::rrc::sib_type3_s* sib3ptr() { return &sib3; }
asn1::rrc::sib_type13_r9_s* sib13ptr() { return &sib13; }
uint32_t get_cell_id() { return (uint32_t)sib1.cell_access_related_info.cell_id.to_number(); }
bool has_sib1() { return has_valid_sib1; }
bool has_sib2() { return has_valid_sib2; }
bool has_sib3() { return has_valid_sib3; }
bool has_sib13() { return has_valid_sib13; }
bool has_sib(uint32_t index)
{
switch (index) {
case 0:
return has_sib1();
case 1:
return has_sib2();
case 2:
return has_sib3();
case 12:
return has_sib13();
}
return false;
}
void reset_sibs()
{
has_valid_sib1 = false;
has_valid_sib2 = false;
has_valid_sib3 = false;
has_valid_sib13 = false;
}
uint16_t get_mcc()
{
uint16_t mcc;
if (has_valid_sib1) {
if (sib1.cell_access_related_info.plmn_id_list.size() > 0) {
if (srslte::bytes_to_mcc(&sib1.cell_access_related_info.plmn_id_list[0].plmn_id.mcc[0], &mcc)) {
return mcc;
}
}
}
return 0;
}
uint16_t get_mnc()
{
uint16_t mnc;
if (has_valid_sib1) {
if (sib1.cell_access_related_info.plmn_id_list.size() > 0) {
if (srslte::bytes_to_mnc(&sib1.cell_access_related_info.plmn_id_list[0].plmn_id.mnc[0],
&mnc,
sib1.cell_access_related_info.plmn_id_list[0].plmn_id.mnc.size())) {
return mnc;
}
}
}
return 0;
}
std::string to_string()
{
char buf[256];
snprintf(buf,
256,
"{cell_id: 0x%x, pci: %d, dl_earfcn: %d, rsrp=%+.1f}",
get_cell_id(),
get_pci(),
get_earfcn(),
get_rsrp());
return std::string{buf};
}
bool is_sib_scheduled(uint32_t sib_index) const;
phy_interface_rrc_lte::phy_cell_t phy_cell = {};
bool has_mcch = false;
asn1::rrc::sib_type1_s sib1;
asn1::rrc::sib_type2_s sib2;
asn1::rrc::sib_type3_s sib3;
asn1::rrc::sib_type13_r9_s sib13;
asn1::rrc::mcch_msg_s mcch;
private:
float rsrp = NAN;
float rsrq = NAN;
struct timeval last_update = {};
bool has_valid_sib1 = false;
bool has_valid_sib2 = false;
bool has_valid_sib3 = false;
bool has_valid_sib13 = false;
std::map<uint32_t, uint32_t> sib_info_map; ///< map of sib_index to index of schedInfoList in SIB1
};
class rrc : public rrc_interface_nas,
public rrc_interface_phy_lte,
public rrc_interface_mac,
public rrc_interface_pdcp,
public rrc_interface_rlc,
public srslte::timer_callback
{
public:
rrc(stack_interface_rrc* stack_);
~rrc();
void init(phy_interface_rrc_lte* phy_,
mac_interface_rrc* mac_,
rlc_interface_rrc* rlc_,
pdcp_interface_rrc* pdcp_,
nas_interface_rrc* nas_,
usim_interface_rrc* usim_,
gw_interface_rrc* gw_,
const rrc_args_t& args_);
void stop();
void get_metrics(rrc_metrics_t& m);
// Timeout callback interface
void timer_expired(uint32_t timeout_id);
void srslte_rrc_log(const char* str);
typedef enum { Rx = 0, Tx } direction_t;
template <class T>
void log_rrc_message(const std::string source,
const direction_t dir,
const srslte::byte_buffer_t* pdu,
const T& msg,
const std::string& msg_type);
std::string print_mbms();
bool mbms_service_start(uint32_t serv, uint32_t port);
// NAS interface
void write_sdu(srslte::unique_byte_buffer_t sdu);
void enable_capabilities();
uint16_t get_mcc();
uint16_t get_mnc();
bool plmn_search() final;
void plmn_select(srslte::plmn_id_t plmn_id);
bool connection_request(srslte::establishment_cause_t cause, srslte::unique_byte_buffer_t dedicated_info_nas);
void set_ue_identity(srslte::s_tmsi_t s_tmsi);
void paging_completed(bool outcome) final;
// PHY interface
void in_sync() final;
void out_of_sync() final;
void new_cell_meas(const std::vector<phy_meas_t>& meas);
// MAC interface
void ho_ra_completed(bool ra_successful);
void release_pucch_srs();
void run_tti();
void ra_problem();
// GW interface
bool is_connected(); // this is also NAS interface
bool have_drb();
// PDCP interface
void write_pdu(uint32_t lcid, srslte::unique_byte_buffer_t pdu);
void write_pdu_bcch_bch(srslte::unique_byte_buffer_t pdu);
void write_pdu_bcch_dlsch(srslte::unique_byte_buffer_t pdu);
void write_pdu_pcch(srslte::unique_byte_buffer_t pdu);
void write_pdu_mch(uint32_t lcid, srslte::unique_byte_buffer_t pdu);
// STACK interface
void cell_search_completed(const phy_interface_rrc_lte::cell_search_ret_t& cs_ret,
const phy_interface_rrc_lte::phy_cell_t& found_cell);
void cell_select_completed(bool cs_ret);
protected:
// Moved to protected to be accessible by unit tests
void set_serving_cell(phy_interface_rrc_lte::phy_cell_t phy_cell, bool discard_serving);
bool has_neighbour_cell(const uint32_t earfcn, const uint32_t pci);
private:
typedef struct {
enum { PDU, PCCH, PDU_MCH, RLF, PDU_BCCH_DLSCH, HO_COMPLETE, STOP } command;
srslte::unique_byte_buffer_t pdu;
uint16_t lcid;
} cmd_msg_t;
bool running = false;
srslte::block_queue<cmd_msg_t> cmd_q;
void process_pcch(srslte::unique_byte_buffer_t pdu);
stack_interface_rrc* stack = nullptr;
srslte::byte_buffer_pool* pool = nullptr;
srslte::log_ref rrc_log;
phy_interface_rrc_lte* phy = nullptr;
mac_interface_rrc* mac = nullptr;
rlc_interface_rrc* rlc = nullptr;
pdcp_interface_rrc* pdcp = nullptr;
nas_interface_rrc* nas = nullptr;
usim_interface_rrc* usim = nullptr;
gw_interface_rrc* gw = nullptr;
srslte::unique_byte_buffer_t dedicated_info_nas;
void send_ul_ccch_msg(const asn1::rrc::ul_ccch_msg_s& msg);
void send_ul_dcch_msg(uint32_t lcid, const asn1::rrc::ul_dcch_msg_s& msg);
srslte::bit_buffer_t bit_buf;
rrc_state_t state = RRC_STATE_IDLE, last_state = RRC_STATE_IDLE;
uint8_t transaction_id = 0;
srslte::s_tmsi_t ue_identity;
bool ue_identity_configured = false;
bool drb_up = false;
typedef enum { phy_unknown_sync = 0, phy_in_sync, phy_out_of_sync } phy_sync_state_t;
phy_sync_state_t phy_sync_state = phy_unknown_sync;
rrc_args_t args = {};
uint32_t cell_clean_cnt = 0;
uint16_t ho_src_rnti = 0;
cell_t ho_src_cell = {};
srslte::phy_cfg_t current_phy_cfg, previous_phy_cfg = {};
srslte::mac_cfg_t current_mac_cfg, previous_mac_cfg = {};
bool pending_mob_reconf = false;
asn1::rrc::rrc_conn_recfg_s mob_reconf = {};
srslte::as_security_config_t sec_cfg = {};
std::map<uint32_t, asn1::rrc::srb_to_add_mod_s> srbs;
std::map<uint32_t, asn1::rrc::drb_to_add_mod_s> drbs;
// RRC constants and timers
uint32_t n310_cnt = 0, N310 = 0;
uint32_t n311_cnt = 0, N311 = 0;
srslte::timer_handler::unique_timer t300, t301, t302, t310, t311, t304;
// Radio bearers
typedef enum {
RB_ID_SRB0 = 0,
RB_ID_SRB1,
RB_ID_SRB2,
RB_ID_DRB1,
RB_ID_DRB2,
RB_ID_DRB3,
RB_ID_DRB4,
RB_ID_DRB5,
RB_ID_DRB6,
RB_ID_DRB7,
RB_ID_DRB8,
RB_ID_MAX
} rb_id_t;
static const std::string rb_id_str[];
std::string get_rb_name(uint32_t lcid)
{
if (lcid < RB_ID_MAX) {
return rb_id_str[lcid];
} else {
return "INVALID_RB";
}
}
// List of strongest neighbour cell
const static int NEIGHBOUR_TIMEOUT = 5;
const static int NOF_NEIGHBOUR_CELLS = 8;
typedef std::unique_ptr<cell_t> unique_cell_t;
std::vector<unique_cell_t> neighbour_cells;
unique_cell_t serving_cell = nullptr;
void set_serving_cell(uint32_t cell_idx);
unique_cell_t remove_neighbour_cell(const uint32_t earfcn, const uint32_t pci);
cell_t* get_neighbour_cell_handle(const uint32_t earfcn, const uint32_t pci);
int find_neighbour_cell(uint32_t earfcn, uint32_t pci);
bool add_neighbour_cell(phy_meas_t meas);
bool add_neighbour_cell(unique_cell_t new_cell);
void log_neighbour_cells();
void sort_neighbour_cells();
void clean_neighbours();
void delete_last_neighbour();
std::string print_neighbour_cells();
std::set<uint32_t> get_neighbour_pcis(uint32_t earfcn);
bool initiated = false;
asn1::rrc::reest_cause_e m_reest_cause = asn1::rrc::reest_cause_e::nulltype;
uint16_t m_reest_rnti = 0;
uint16_t m_reest_source_pci = 0;
bool reestablishment_started = false;
bool reestablishment_successful = false;
// Process HO completition in the background
void process_ho_ra_completed(bool ra_successful);
// Measurements private subclass
class rrc_meas;
std::unique_ptr<rrc_meas> measurements;
// Interface from rrc_meas
void send_srb1_msg(const asn1::rrc::ul_dcch_msg_s& msg);
std::set<uint32_t> get_cells(const uint32_t earfcn);
float get_cell_rsrp(const uint32_t earfcn, const uint32_t pci);
float get_cell_rsrq(const uint32_t earfcn, const uint32_t pci);
cell_t* get_serving_cell();
void process_cell_meas();
void process_new_cell_meas(const std::vector<phy_meas_t>& meas);
srslte::block_queue<std::vector<phy_meas_t> > cell_meas_q;
// Cell selection/reselection functions/variables
typedef struct {
float Qrxlevmin;
float Qrxlevminoffset;
float Qqualmin;
float Qqualminoffset;
float s_intrasearchP;
float q_hyst;
float threshservinglow;
} cell_resel_cfg_t;
cell_resel_cfg_t cell_resel_cfg = {};
float get_srxlev(float Qrxlevmeas);
float get_squal(float Qqualmeas);
/********************
* RRC Procedures
*******************/
enum class cs_result_t { changed_cell, same_cell, no_cell };
// RRC procedures (fwd declared)
class cell_search_proc;
class si_acquire_proc;
class serving_cell_config_proc;
class cell_selection_proc;
class connection_request_proc;
class plmn_search_proc;
class process_pcch_proc;
class go_idle_proc;
class cell_reselection_proc;
class connection_reest_proc;
srslte::proc_t<cell_search_proc, phy_interface_rrc_lte::cell_search_ret_t> cell_searcher;
srslte::proc_t<si_acquire_proc> si_acquirer;
srslte::proc_t<serving_cell_config_proc> serv_cell_cfg;
srslte::proc_t<cell_selection_proc, cs_result_t> cell_selector;
srslte::proc_t<go_idle_proc> idle_setter;
srslte::proc_t<process_pcch_proc> pcch_processor;
srslte::proc_t<connection_request_proc> conn_req_proc;
srslte::proc_t<plmn_search_proc> plmn_searcher;
srslte::proc_t<cell_reselection_proc> cell_reselector;
srslte::proc_t<connection_reest_proc> connection_reest;
srslte::proc_manager_list_t callback_list;
bool cell_selection_criteria(float rsrp, float rsrq = 0);
void cell_reselection(float rsrp, float rsrq);
std::vector<uint32_t> ue_required_sibs;
srslte::plmn_id_t selected_plmn_id = {};
bool plmn_is_selected = false;
bool security_is_activated = false;
// RLC interface
void max_retx_attempted();
// Senders
void send_con_request(srslte::establishment_cause_t cause);
void send_con_restablish_request(asn1::rrc::reest_cause_e cause, uint16_t rnti, uint16_t pci);
void send_con_restablish_complete();
void send_con_setup_complete(srslte::unique_byte_buffer_t nas_msg);
void send_ul_info_transfer(srslte::unique_byte_buffer_t nas_msg);
void send_security_mode_complete();
void send_rrc_con_reconfig_complete();
// Parsers
void process_pdu(uint32_t lcid, srslte::unique_byte_buffer_t pdu);
void parse_dl_ccch(srslte::unique_byte_buffer_t pdu);
void parse_dl_dcch(uint32_t lcid, srslte::unique_byte_buffer_t pdu);
void parse_dl_info_transfer(uint32_t lcid, srslte::unique_byte_buffer_t pdu);
void parse_pdu_bcch_dlsch(srslte::unique_byte_buffer_t pdu);
void parse_pdu_mch(uint32_t lcid, srslte::unique_byte_buffer_t pdu);
// Helpers
bool con_reconfig(asn1::rrc::rrc_conn_recfg_s* reconfig);
void con_reconfig_failed();
bool con_reconfig_ho(asn1::rrc::rrc_conn_recfg_s* reconfig);
bool ho_prepare();
void ho_failed();
void start_ho();
void start_go_idle();
void rrc_connection_release(const std::string& cause);
void radio_link_failure();
void leave_connected();
void stop_timers();
void start_con_restablishment(asn1::rrc::reest_cause_e cause);
void start_cell_reselection();
void log_rr_config_common();
void log_phy_config_dedicated();
void log_mac_config_dedicated();
void apply_rr_config_common(asn1::rrc::rr_cfg_common_s* config, bool send_lower_layers);
bool apply_rr_config_dedicated(asn1::rrc::rr_cfg_ded_s* cnfg);
void apply_scell_config(asn1::rrc::rrc_conn_recfg_r8_ies_s* reconfig_r8);
void apply_phy_config_dedicated(const asn1::rrc::phys_cfg_ded_s& phy_cnfg);
void apply_phy_scell_config(const asn1::rrc::scell_to_add_mod_r10_s& scell_config);
void apply_mac_config_dedicated_default();
void handle_sib1();
void handle_sib2();
void handle_sib3();
void handle_sib13();
void handle_con_setup(asn1::rrc::rrc_conn_setup_s* setup);
void handle_con_reest(asn1::rrc::rrc_conn_reest_s* setup);
void handle_rrc_con_reconfig(uint32_t lcid, asn1::rrc::rrc_conn_recfg_s* reconfig);
void handle_ue_capability_enquiry(const asn1::rrc::ue_cap_enquiry_s& enquiry);
void add_srb(asn1::rrc::srb_to_add_mod_s* srb_cnfg);
void add_drb(asn1::rrc::drb_to_add_mod_s* drb_cnfg);
void release_drb(uint32_t drb_id);
uint32_t get_lcid_for_eps_bearer(const uint32_t& eps_bearer_id);
void add_mrb(uint32_t lcid, uint32_t port);
// Helpers for setting default values
void set_phy_default_pucch_srs();
void set_phy_config_dedicated_default();
void set_phy_default();
void set_mac_default();
void set_rrc_default();
};
} // namespace srsue
#endif // SRSUE_RRC_H
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