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146 lines
4.4 KiB
C++
146 lines
4.4 KiB
C++
/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2021 Software Radio Systems Limited
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*
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* By using this file, you agree to the terms and conditions set
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* forth in the LICENSE file which can be found at the top level of
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* the distribution.
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*
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*/
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#ifndef SRSRAN_BEARER_MANAGER_H
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#define SRSRAN_BEARER_MANAGER_H
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#include "srsenb/hdr/common/common_enb.h"
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#include "srsran/common/common.h"
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#include "srsran/common/rwlock_guard.h"
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#include "srsran/srslog/srslog.h"
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#include <map>
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#include <stdint.h>
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namespace srsran {
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namespace detail {
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/**
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* @brief Implementation of UE bearer manager internal functionality that is common to both srsue and
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* srsenb applications
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*/
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class ue_bearer_manager_impl
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{
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public:
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struct radio_bearer_t {
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srsran::srsran_rat_t rat;
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uint32_t lcid;
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uint32_t eps_bearer_id;
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bool is_valid() const { return rat != srsran_rat_t::nulltype; }
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};
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static const radio_bearer_t invalid_rb;
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/// Registers EPS bearer with PDCP RAT type and LCID
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bool add_eps_bearer(uint8_t eps_bearer_id, srsran::srsran_rat_t rat, uint32_t lcid);
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/// Single EPS bearer is removed from map when the associated DRB is deleted
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bool remove_eps_bearer(uint8_t eps_bearer_id);
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void reset();
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bool has_active_radio_bearer(uint32_t eps_bearer_id);
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radio_bearer_t get_radio_bearer(uint32_t eps_bearer_id);
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radio_bearer_t get_lcid_bearer(uint32_t lcid);
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private:
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using eps_rb_map_t = std::map<uint32_t, radio_bearer_t>;
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eps_rb_map_t bearers;
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std::map<uint32_t, uint32_t> lcid_to_eps_bearer_id;
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};
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} // namespace detail
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} // namespace srsran
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namespace srsue {
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/**
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* @brief Helper class to manage the mapping between EPS bearer and radio bearer
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*
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* The class maps EPS bearers that are known to NAS and GW (UE)
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* to radio bearer (RB) that are only known to RRC.
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* Since the lifetime of a EPS bearer is usually longer than the lifetime of a RB,
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* the GW/GTPU needs to query the Stack to check whether a
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* given EPS bearer is active, i.e. a DRB is established, or not.
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*
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* The class also maps between RATs since each LCID can exist on either EUTRA or NR RATs, or both.
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*
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* Since the access of this class is happening from two different threads (GW+RRC/Stack)
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* it's public interface is protected.
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*
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* The class provides two interfaces to be used with RNTI or without. The version without
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* RNTI is used by the UE. The version with RNTI in the interface is intented to be
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* used by the eNB.
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*
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*/
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class ue_bearer_manager
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{
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public:
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using radio_bearer_t = srsran::detail::ue_bearer_manager_impl::radio_bearer_t;
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ue_bearer_manager();
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ue_bearer_manager(const ue_bearer_manager&) = delete;
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ue_bearer_manager& operator=(const ue_bearer_manager&) = delete;
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~ue_bearer_manager();
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// RRC interface
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/// Registers EPS bearer with PDCP RAT type and LCID
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void add_eps_bearer(uint8_t eps_bearer_id, srsran::srsran_rat_t rat, uint32_t lcid);
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/// Single EPS bearer is removed from map when the associated DRB is deleted
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void remove_eps_bearer(uint8_t eps_bearer_id);
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/// All registered bearer are removed (e.g. after connection release)
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void reset();
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bool has_active_radio_bearer(uint32_t eps_bearer_id) { return impl.has_active_radio_bearer(eps_bearer_id); }
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radio_bearer_t get_radio_bearer(uint32_t eps_bearer_id) { return impl.get_radio_bearer(eps_bearer_id); }
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radio_bearer_t get_lcid_bearer(uint32_t lcid) { return impl.get_lcid_bearer(lcid); }
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private:
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pthread_rwlock_t rwlock = {}; /// RW lock to protect access from RRC/GW threads
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srslog::basic_logger& logger;
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srsran::detail::ue_bearer_manager_impl impl;
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};
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} // namespace srsue
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namespace srsenb {
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class enb_bearer_manager
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{
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public:
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using radio_bearer_t = srsran::detail::ue_bearer_manager_impl::radio_bearer_t;
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enb_bearer_manager();
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/// Multi-user interface (see comments above)
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void add_eps_bearer(uint16_t rnti, uint8_t eps_bearer_id, srsran::srsran_rat_t rat, uint32_t lcid);
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void remove_eps_bearer(uint16_t rnti, uint8_t eps_bearer_id);
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void rem_user(uint16_t rnti);
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bool has_active_radio_bearer(uint16_t rnti, uint32_t eps_bearer_id);
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radio_bearer_t get_radio_bearer(uint16_t rnti, uint32_t eps_bearer_id);
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radio_bearer_t get_lcid_bearer(uint16_t rnti, uint32_t lcid);
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private:
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srslog::basic_logger& logger;
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srsenb::rnti_map_t<srsran::detail::ue_bearer_manager_impl> users_map;
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};
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} // namespace srsenb
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#endif // SRSRAN_BEARER_MANAGER_H
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