mirror of https://github.com/pvnis/srsRAN_4G.git
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
217 lines
7.3 KiB
C++
217 lines
7.3 KiB
C++
/**
|
|
*
|
|
* \section COPYRIGHT
|
|
*
|
|
* Copyright 2013-2021 Software Radio Systems Limited
|
|
*
|
|
* By using this file, you agree to the terms and conditions set
|
|
* forth in the LICENSE file which can be found at the top level of
|
|
* the distribution.
|
|
*
|
|
*/
|
|
|
|
#ifndef SRSRAN_RLC_AM_NR_H
|
|
#define SRSRAN_RLC_AM_NR_H
|
|
|
|
#include "srsran/common/buffer_pool.h"
|
|
#include "srsran/common/common.h"
|
|
#include "srsran/common/timers.h"
|
|
#include "srsran/rlc/rlc_am_base.h"
|
|
#include "srsran/rlc/rlc_am_data_structs.h"
|
|
#include "srsran/rlc/rlc_am_nr_packing.h"
|
|
#include "srsran/upper/byte_buffer_queue.h"
|
|
#include <map>
|
|
#include <mutex>
|
|
#include <pthread.h>
|
|
#include <queue>
|
|
|
|
namespace srsran {
|
|
|
|
/******************************
|
|
*
|
|
* RLC AM NR entity
|
|
*
|
|
*****************************/
|
|
class rlc_am_nr_tx;
|
|
class rlc_am_nr_rx;
|
|
|
|
/****************************************************************************
|
|
* Tx state variables
|
|
* Ref: 3GPP TS 38.322 v16.2.0 Section 7.1
|
|
***************************************************************************/
|
|
struct rlc_am_nr_tx_state_t {
|
|
/*
|
|
* TX_Next_Ack: This state variable holds the value of the SN of the next RLC SDU for which a positive
|
|
* acknowledgment is to be received in-sequence, and it serves as the lower edge of the transmitting window. It is
|
|
* initially set to 0, and is updated whenever the AM RLC entity receives a positive acknowledgment for an RLC SDU
|
|
* with SN = TX_Next_Ack.
|
|
*/
|
|
uint32_t tx_next_ack;
|
|
/*
|
|
* TX_Next: This state variable holds the value of the SN to be assigned for the next newly generated AMD PDU. It is
|
|
* initially set to 0, and is updated whenever the AM RLC entity constructs an AMD PDU with SN = TX_Next and
|
|
* contains an RLC SDU or the last segment of a RLC SDU.
|
|
*/
|
|
uint32_t tx_next;
|
|
/*
|
|
* POLL_SN: This state variable holds the value of the highest SN of the AMD PDU among the AMD PDUs submitted to
|
|
* lower layer when POLL_SN is set according to sub clause 5.3.3.2. It is initially set to 0.
|
|
*/
|
|
uint32_t poll_sn;
|
|
/*
|
|
* PDU_WITHOUT_POLL: This counter is initially set to 0. It counts the number of AMD PDUs sent since the most recent
|
|
* poll bit was transmitted.
|
|
*/
|
|
uint32_t pdu_without_poll;
|
|
/*
|
|
* BYTE_WITHOUT_POLL: This counter is initially set to 0. It counts the number of data bytes sent since the most
|
|
* recent poll bit was transmitted.
|
|
*/
|
|
uint32_t byte_without_poll;
|
|
};
|
|
|
|
class rlc_am_nr_tx : public rlc_am::rlc_am_base_tx
|
|
{
|
|
public:
|
|
explicit rlc_am_nr_tx(rlc_am* parent_);
|
|
~rlc_am_nr_tx() = default;
|
|
|
|
void set_rx(rlc_am_nr_rx* rx_) { rx = rx_; }
|
|
bool configure(const rlc_config_t& cfg_) final;
|
|
uint32_t read_pdu(uint8_t* payload, uint32_t nof_bytes) final;
|
|
void handle_control_pdu(uint8_t* payload, uint32_t nof_bytes) final;
|
|
|
|
void discard_sdu(uint32_t discard_sn) final;
|
|
bool sdu_queue_is_full() final;
|
|
void reestablish() final;
|
|
|
|
int write_sdu(unique_byte_buffer_t sdu);
|
|
void empty_queue() final;
|
|
bool has_data() final;
|
|
uint32_t get_buffer_state() final;
|
|
void get_buffer_state(uint32_t& tx_queue, uint32_t& prio_tx_queue) final;
|
|
|
|
bool do_status();
|
|
uint32_t build_status_pdu(byte_buffer_t* payload, uint32_t nof_bytes);
|
|
|
|
uint8_t get_pdu_poll();
|
|
|
|
int build_retx_pdu(byte_buffer_t* payload, uint32_t nof_bytes);
|
|
|
|
void stop() final;
|
|
|
|
private:
|
|
rlc_am* parent = nullptr;
|
|
rlc_am_nr_rx* rx = nullptr;
|
|
|
|
/****************************************************************************
|
|
* Configurable parameters
|
|
* Ref: 3GPP TS 38.322 v16.2.0 Section 7.4
|
|
***************************************************************************/
|
|
rlc_am_nr_config_t cfg = {};
|
|
|
|
/****************************************************************************
|
|
* Tx state variables
|
|
* Ref: 3GPP TS 38.322 v16.2.0 Section 7.1
|
|
***************************************************************************/
|
|
struct rlc_am_nr_tx_state_t st = {};
|
|
|
|
using rlc_amd_tx_pdu_nr = rlc_amd_tx_pdu<rlc_am_nr_pdu_header_t>;
|
|
rlc_ringbuffer_t<rlc_amd_tx_pdu_nr, RLC_AM_WINDOW_SIZE> tx_window;
|
|
pdu_retx_queue<RLC_AM_WINDOW_SIZE> retx_queue;
|
|
|
|
public:
|
|
// Getters/Setters
|
|
rlc_am_nr_tx_state_t get_tx_state() { return st; } // This should only be used for testing.
|
|
uint32_t get_tx_window_size() { return tx_window.size(); } // This should only be used for testing.
|
|
};
|
|
|
|
// Receiver sub-class
|
|
class rlc_am_nr_rx : public rlc_am::rlc_am_base_rx
|
|
{
|
|
public:
|
|
explicit rlc_am_nr_rx(rlc_am* parent_);
|
|
~rlc_am_nr_rx() = default;
|
|
|
|
void set_tx(rlc_am_nr_tx* tx_) { tx = tx_; }
|
|
bool configure(const rlc_config_t& cfg_) final;
|
|
|
|
void handle_data_pdu(uint8_t* payload, uint32_t nof_bytes) final;
|
|
|
|
void stop();
|
|
void reestablish();
|
|
|
|
// Status PDU
|
|
bool get_do_status();
|
|
uint32_t get_status_pdu(rlc_am_nr_status_pdu_t* status, uint32_t len);
|
|
uint32_t get_status_pdu_length();
|
|
|
|
// Data handling methods
|
|
void handle_data_pdu_full(uint8_t* payload, uint32_t nof_bytes, rlc_am_nr_pdu_header_t& header);
|
|
bool inside_rx_window(uint32_t sn);
|
|
void write_to_upper_layers(uint32_t lcid, unique_byte_buffer_t sdu);
|
|
|
|
// Metrics
|
|
uint32_t get_sdu_rx_latency_ms() final;
|
|
uint32_t get_rx_buffered_bytes() final;
|
|
|
|
// Timers
|
|
void timer_expired(uint32_t timeout_id);
|
|
|
|
// Helpers
|
|
void debug_state();
|
|
|
|
private:
|
|
rlc_am* parent = nullptr;
|
|
rlc_am_nr_tx* tx = nullptr;
|
|
byte_buffer_pool* pool = nullptr;
|
|
|
|
// RX Window
|
|
rlc_ringbuffer_t<rlc_amd_rx_sdu_nr_t, RLC_AM_WINDOW_SIZE> rx_window;
|
|
|
|
// Mutexes
|
|
std::mutex mutex;
|
|
|
|
/****************************************************************************
|
|
* State Variables
|
|
* Ref: 3GPP TS 38.322 v16.2.0 Section 7.1
|
|
***************************************************************************/
|
|
/*
|
|
* RX_Next: This state variable holds the value of the SN following the last in-sequence completely received RLC
|
|
* SDU, and it serves as the lower edge of the receiving window. It is initially set to 0, and is updated whenever
|
|
* the AM RLC entity receives an RLC SDU with SN = RX_Next.
|
|
*/
|
|
uint32_t rx_next = 0;
|
|
/*
|
|
* RX_Next_Status_Trigger: This state variable holds the value of the SN following the SN of the RLC SDU which
|
|
* triggered t-Reassembly.
|
|
*/
|
|
uint32_t rx_next_status_trigger = 0;
|
|
/*
|
|
* RX_Next_Highest: This state variable holds the highest possible value of the SN which can be indicated by
|
|
*"ACK_SN" when a STATUS PDU needs to be constructed. It is initially set to 0.
|
|
*/
|
|
uint32_t rx_highest_status = 0;
|
|
/*
|
|
* RX_Next_Highest: This state variable holds the value of the SN following the SN of the RLC SDU with the
|
|
* highest SN among received RLC SDUs. It is initially set to 0.
|
|
*/
|
|
uint32_t rx_next_highest = 0;
|
|
|
|
/****************************************************************************
|
|
* Rx timers
|
|
* Ref: 3GPP TS 38.322 v16.2.0 Section 7.3
|
|
***************************************************************************/
|
|
srsran::timer_handler::unique_timer status_prohibit_timer;
|
|
srsran::timer_handler::unique_timer reassembly_timer;
|
|
|
|
/****************************************************************************
|
|
* Configurable parameters
|
|
* Ref: 3GPP TS 38.322 v16.2.0 Section 7.4
|
|
***************************************************************************/
|
|
rlc_am_nr_config_t cfg = {};
|
|
};
|
|
|
|
} // namespace srsran
|
|
#endif // SRSRAN_RLC_AM_NR_H
|