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141 lines
4.9 KiB
C++
141 lines
4.9 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_RLC_UM_NR_H
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#define SRSRAN_RLC_UM_NR_H
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#include "srsran/common/buffer_pool.h"
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#include "srsran/common/common.h"
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#include "srsran/interfaces/ue_interfaces.h"
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#include "srsran/upper/byte_buffer_queue.h"
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#include "srsran/upper/rlc_um_base.h"
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#include <map>
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#include <mutex>
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#include <pthread.h>
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#include <queue>
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namespace srsran {
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typedef struct {
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rlc_um_nr_pdu_header_t header;
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unique_byte_buffer_t buf;
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} rlc_umd_pdu_nr_t;
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class rlc_um_nr : public rlc_um_base
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{
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public:
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rlc_um_nr(srslog::basic_logger& logger,
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uint32_t lcid_,
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srsue::pdcp_interface_rlc* pdcp_,
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srsue::rrc_interface_rlc* rrc_,
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srsran::timer_handler* timers_);
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~rlc_um_nr();
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bool configure(const rlc_config_t& cnfg);
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private:
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// Transmitter sub-class for NR
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class rlc_um_nr_tx : public rlc_um_base_tx
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{
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public:
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rlc_um_nr_tx(rlc_um_base* parent_);
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bool configure(const rlc_config_t& cfg, std::string rb_name);
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uint32_t build_data_pdu(unique_byte_buffer_t pdu, uint8_t* payload, uint32_t nof_bytes);
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uint32_t get_buffer_state();
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private:
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void reset();
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uint32_t TX_Next = 0; // send state as defined in TS 38.322 v15.3 Section 7
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// It holds the value of the SN to be assigned for the next newly generated UMD PDU with
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// segment. It is initially set to 0, and is updated after the UM RLC entity submits a UMD PDU
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// including the last segment of an RLC SDU to lower layers.
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uint32_t next_so = 0; // The segment offset for the next generated PDU
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static constexpr uint32_t head_len_full = 1; // full SDU header size is always
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uint32_t head_len_first = 0, head_len_segment = 0; // are computed during configure based on SN length
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void debug_state();
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};
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// Receiver sub-class for NR
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class rlc_um_nr_rx : public rlc_um_base_rx
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{
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public:
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rlc_um_nr_rx(rlc_um_base* parent_);
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bool configure(const rlc_config_t& cnfg_, std::string rb_name_);
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void handle_data_pdu(uint8_t* payload, uint32_t nof_bytes);
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void reestablish();
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void stop();
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void timer_expired(uint32_t timeout_id);
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private:
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bool sn_in_reassembly_window(const uint32_t sn);
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bool sn_invalid_for_rx_buffer(const uint32_t sn);
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bool has_missing_byte_segment(const uint32_t sn);
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unique_byte_buffer_t
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rlc_um_nr_strip_pdu_header(const rlc_um_nr_pdu_header_t& header, const uint8_t* payload, const uint32_t nof_bytes);
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void handle_rx_buffer_update(const uint32_t sn);
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uint32_t RX_Next_Reassembly = 0; // the earliest SN that is still considered for reassembly
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uint32_t RX_Timer_Trigger = 0; // the SN following the SN which triggered t-Reassembly
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uint32_t RX_Next_Highest = 0; // the SN following the SN of the UMD PDU with the highest SN among
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// received UMD PDUs. It serves as the higher edge of the reassembly window.
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// Rx window
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typedef struct {
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std::map<uint32_t, rlc_umd_pdu_nr_t> segments; // Map of segments with SO as key
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unique_byte_buffer_t sdu;
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uint32_t next_expected_so;
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uint32_t total_sdu_length;
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} rlc_umd_pdu_segments_nr_t;
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std::map<uint32_t, rlc_umd_pdu_segments_nr_t> rx_window;
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void update_total_sdu_length(rlc_umd_pdu_segments_nr_t& pdu_segments, const rlc_umd_pdu_nr_t& rx_pdu);
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// TS 38.322 Sec. 7.3
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srsran::timer_handler::unique_timer reassembly_timer; // to detect loss of RLC PDUs at lower layers
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// helper functions
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void reset();
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void debug_state();
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std::mutex mutex;
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};
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};
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/****************************************************************************
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* Header pack/unpack helper functions for NR
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* Ref: 3GPP TS 38.322 v15.3.0 Section 6.2.2.3
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***************************************************************************/
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uint32_t rlc_um_nr_read_data_pdu_header(const byte_buffer_t* pdu,
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const rlc_um_nr_sn_size_t sn_size,
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rlc_um_nr_pdu_header_t* header);
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uint32_t rlc_um_nr_read_data_pdu_header(const uint8_t* payload,
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const uint32_t nof_bytes,
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const rlc_um_nr_sn_size_t sn_size,
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rlc_um_nr_pdu_header_t* header);
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uint32_t rlc_um_nr_write_data_pdu_header(const rlc_um_nr_pdu_header_t& header, byte_buffer_t* pdu);
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uint32_t rlc_um_nr_packed_length(const rlc_um_nr_pdu_header_t& header);
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} // namespace srsran
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#endif // SRSRAN_RLC_UM_NR_H
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