mirror of https://github.com/pvnis/srsRAN_4G.git
mac_nr: add DL HARQ
this commit adds a complete DL HARQ entity to the MAC of the UE. It also refactors demux into an own class and adapts the PHY-MAC interface to use the new MAC capabilities.master
Andre Puschmann
4 years ago
parent
e3e4564a7e
commit
b9ae064338
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/**
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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 SRSLTE_DEMUX_NR_H
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#define SRSLTE_DEMUX_NR_H
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#include "mac_nr_interfaces.h"
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#include "srsran/common/block_queue.h"
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#include "srsran/interfaces/ue_rlc_interfaces.h"
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namespace srsue {
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/**
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* @brief Logical Channel Demultiplexing and MAC CE dissassemble according to TS 38.321
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*
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* Currently only SDU handling for SCH PDU processing is implemented.
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* Downlink CE are parsed but not handled.
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*
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* PDUs can be pushed by multiple HARQ processes in parallel.
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* Handling of the PDUs is done from Stack thread which reads the enqueued PDUs
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* from the thread-safe queue.
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*/
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class demux_nr : public demux_interface_harq_nr
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{
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public:
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demux_nr(srslog::basic_logger& logger_);
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~demux_nr();
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int32_t init(rlc_interface_mac* rlc_);
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void process_pdus(); /// Called by MAC to process received PDUs
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// HARQ interface
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void push_pdu(srsran::unique_byte_buffer_t pdu, uint32_t tti);
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private:
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// internal helpers
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void handle_pdu(srsran::unique_byte_buffer_t pdu);
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srslog::basic_logger& logger;
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rlc_interface_mac* rlc = nullptr;
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///< currently only DCH PDUs supported (add BCH, PCH, etc)
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srsran::block_queue<srsran::unique_byte_buffer_t> pdu_queue;
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srsran::mac_sch_pdu_nr rx_pdu;
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};
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} // namespace srsue
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#endif // SRSLTE_DEMUX_NR_H
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@ -0,0 +1,103 @@
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/**
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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 SRSLTE_DL_HARQ_NR_H
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#define SRSLTE_DL_HARQ_NR_H
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#include "srsran/interfaces/mac_interface_types.h"
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#include "srsran/interfaces/ue_nr_interfaces.h"
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#include "srsran/srslog/logger.h"
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#include "srsue/hdr/stack/mac_nr/mac_nr_interfaces.h"
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#include <mutex>
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namespace srsue {
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/**
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* @brief Downlink HARQ entity as defined in 5.3.2 of 38.321
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*
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* The class supports a configurable number of HARQ processes (up to 16).
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*
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* The class is configured (init and reset) by the MAC class from the
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* Stack thread context. Main functionality, however, is carried
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* out from a PHY worker context.
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*
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* Concurrent access from threads is protected through rwlocks.
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*
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*/
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class dl_harq_entity_nr
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{
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using mac_nr_grant_dl_t = mac_interface_phy_nr::mac_nr_grant_dl_t;
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public:
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dl_harq_entity_nr(uint8_t cc_idx_, mac_interface_harq_nr* mac_, demux_interface_harq_nr* demux_unit_);
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~dl_harq_entity_nr();
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int32_t set_config(const srsran::dl_harq_cfg_nr_t& cfg_);
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void reset();
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/// PHY->MAC interface for DL processes
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void new_grant_dl(const mac_nr_grant_dl_t& grant, mac_interface_phy_nr::tb_action_dl_t* action);
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void tb_decoded(const mac_nr_grant_dl_t& grant, mac_interface_phy_nr::tb_action_dl_result_t result);
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float get_average_retx();
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private:
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class dl_harq_process_nr
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{
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public:
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dl_harq_process_nr(dl_harq_entity_nr* parent);
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~dl_harq_process_nr();
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bool init(int pid);
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void reset(void);
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uint8_t get_ndi();
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void
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new_grant_dl(const mac_nr_grant_dl_t& grant, const bool& ndi_toggled, mac_interface_phy_nr::tb_action_dl_t* action);
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void tb_decoded(const mac_nr_grant_dl_t& grant, mac_interface_phy_nr::tb_action_dl_result_t result);
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private:
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dl_harq_entity_nr* harq_entity = nullptr;
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srslog::basic_logger& logger;
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bool is_first_tb = true;
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bool is_bcch = false;
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uint32_t pid = 0; // HARQ Proccess ID
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bool acked = false;
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uint32_t n_retx = 0;
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mac_nr_grant_dl_t current_grant = {};
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std::unique_ptr<srsran_softbuffer_rx_t> softbuffer_rx;
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};
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// Private members of dl_harq_entity_nr
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mac_interface_harq_nr* mac = nullptr;
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srsran::dl_harq_cfg_nr_t cfg = {};
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std::array<std::unique_ptr<dl_harq_process_nr>, SRSRAN_MAX_HARQ_PROC_DL_NR> harq_procs;
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dl_harq_process_nr bcch_proc;
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demux_interface_harq_nr* demux_unit = nullptr;
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srslog::basic_logger& logger;
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uint16_t last_temporal_crnti = SRSRAN_INVALID_RNTI;
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float average_retx = 0.0;
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uint64_t nof_pkts = 0;
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uint8_t cc_idx = 0;
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pthread_rwlock_t rwlock;
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};
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typedef std::unique_ptr<dl_harq_entity_nr> dl_harq_entity_nr_ptr;
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typedef std::array<dl_harq_entity_nr_ptr, SRSRAN_MAX_CARRIERS> dl_harq_entity_nr_vector;
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} // namespace srsue
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#endif // SRSLTE_DL_HARQ_NR_H
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@ -0,0 +1,81 @@
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/**
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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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#include "srsue/hdr/stack/mac_nr/demux_nr.h"
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#include "srsran/common/buffer_pool.h"
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#include "srsran/interfaces/ue_rlc_interfaces.h"
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namespace srsue {
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demux_nr::demux_nr(srslog::basic_logger& logger_) : logger(logger_) {}
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demux_nr::~demux_nr() {}
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int32_t demux_nr::init(rlc_interface_mac* rlc_)
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{
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rlc = rlc_;
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return SRSRAN_SUCCESS;
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}
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// Enqueues PDU and returns quickly
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void demux_nr::push_pdu(srsran::unique_byte_buffer_t pdu, uint32_t tti)
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{
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pdu_queue.push(std::move(pdu));
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}
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void demux_nr::process_pdus()
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{
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while (not pdu_queue.empty()) {
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srsran::unique_byte_buffer_t pdu = pdu_queue.wait_pop();
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handle_pdu(std::move(pdu));
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}
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}
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/// Handling of DLSCH PDUs only
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void demux_nr::handle_pdu(srsran::unique_byte_buffer_t pdu)
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{
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logger.info(pdu->msg, pdu->N_bytes, "Handling MAC PDU (%d B)", pdu->N_bytes);
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rx_pdu.init_rx();
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if (rx_pdu.unpack(pdu->msg, pdu->N_bytes) != SRSRAN_SUCCESS) {
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return;
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}
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for (uint32_t i = 0; i < rx_pdu.get_num_subpdus(); ++i) {
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srsran::mac_sch_subpdu_nr subpdu = rx_pdu.get_subpdu(i);
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logger.info("Handling subPDU %d/%d: rnti=0x%x lcid=%d, sdu_len=%d",
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i + 1,
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rx_pdu.get_num_subpdus(),
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subpdu.get_c_rnti(),
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subpdu.get_lcid(),
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subpdu.get_sdu_length());
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// Handle Timing Advance CE
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switch (subpdu.get_lcid()) {
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case srsran::mac_sch_subpdu_nr::nr_lcid_sch_t::DRX_CMD:
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logger.info("DRX CE not implemented.");
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break;
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case srsran::mac_sch_subpdu_nr::nr_lcid_sch_t::TA_CMD:
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logger.info("Timing Advance CE not implemented.");
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break;
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case srsran::mac_sch_subpdu_nr::nr_lcid_sch_t::CON_RES_ID:
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logger.info("Contention Resolution CE not implemented.");
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break;
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default:
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if (subpdu.is_sdu()) {
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rlc->write_pdu(subpdu.get_lcid(), subpdu.get_sdu(), subpdu.get_sdu_length());
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}
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}
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}
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}
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} // namespace srsue
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@ -0,0 +1,243 @@
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/**
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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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#include "srsue/hdr/stack/mac_nr/dl_harq_nr.h"
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#include "srsran/common/mac_pcap.h"
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#include "srsran/common/rwlock_guard.h"
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#include "srsran/srslog/logger.h"
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#include "srsue/hdr/stack/mac_nr/demux_nr.h"
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namespace srsue {
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dl_harq_entity_nr::dl_harq_entity_nr(uint8_t cc_idx_,
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mac_interface_harq_nr* mac_,
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demux_interface_harq_nr* demux_unit_) :
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logger(srslog::fetch_basic_logger("MAC-NR")), cc_idx(cc_idx_), mac(mac_), demux_unit(demux_unit_), bcch_proc(this)
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{
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// Init broadcast HARQ process
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bcch_proc.init(-1);
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pthread_rwlock_init(&rwlock, NULL);
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}
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dl_harq_entity_nr::~dl_harq_entity_nr()
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{
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pthread_rwlock_destroy(&rwlock);
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}
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// Called from Stack thread through MAC (TODO: add shared::mutex)
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int32_t dl_harq_entity_nr::set_config(const srsran::dl_harq_cfg_nr_t& cfg_)
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{
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srsran::rwlock_write_guard lock(rwlock);
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if (cfg_.nof_procs < 1 || cfg_.nof_procs > SRSRAN_MAX_HARQ_PROC_DL_NR) {
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logger.error("Invalid configuration: %d HARQ processes not supported", cfg_.nof_procs);
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return SRSRAN_ERROR;
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}
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// clear old processees
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for (auto& proc : harq_procs) {
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proc = nullptr;
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}
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// Allocate and init configured HARQ processes
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for (uint32_t i = 0; i < cfg.nof_procs; i++) {
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harq_procs[i] = std::unique_ptr<dl_harq_process_nr>(new dl_harq_process_nr(this));
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if (!harq_procs.at(i)->init(i)) {
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logger.error("Error while initializing DL-HARQ process %d", i);
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return SRSRAN_ERROR;
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}
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}
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cfg = cfg_;
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logger.debug("cc_idx=%d, set number of HARQ processes for DL to %d", cc_idx, cfg.nof_procs);
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return SRSRAN_SUCCESS;
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}
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// Called from PHY workers
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void dl_harq_entity_nr::new_grant_dl(const mac_nr_grant_dl_t& grant, mac_interface_phy_nr::tb_action_dl_t* action)
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{
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srsran::rwlock_read_guard lock(rwlock);
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*action = {};
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// Fetch HARQ process
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dl_harq_process_nr* proc_ptr = nullptr;
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if (grant.rnti == SRSRAN_SIRNTI) {
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// Set BCCH PID for SI RNTI
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proc_ptr = &bcch_proc;
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} else {
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if (grant.pid >= cfg.nof_procs) {
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logger.error("Invalid PID: %d", grant.pid);
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return;
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}
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proc_ptr = harq_procs.at(grant.pid).get();
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}
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// Check NDI toggled state before forwarding to process
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bool ndi_toggled = (grant.ndi != harq_procs.at(grant.pid)->get_ndi());
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if (grant.rnti == mac->get_temp_crnti() && last_temporal_crnti != mac->get_temp_crnti()) {
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// Consider the NDI to have been toggled
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last_temporal_crnti = mac->get_temp_crnti();
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logger.info("Considering NDI in pid=%d to be toggled for first Temporal C-RNTI", grant.pid);
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ndi_toggled = true;
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}
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proc_ptr->new_grant_dl(std::move(grant), ndi_toggled, action);
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}
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/// Called from PHY workers
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void dl_harq_entity_nr::tb_decoded(const mac_nr_grant_dl_t& grant, mac_interface_phy_nr::tb_action_dl_result_t result)
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{
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srsran::rwlock_read_guard lock(rwlock);
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if (grant.rnti == SRSRAN_SIRNTI) {
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bcch_proc.tb_decoded(grant, std::move(result));
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} else {
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if (grant.pid >= cfg.nof_procs) {
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logger.error("Invalid PID: %d", grant.pid);
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return;
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}
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harq_procs.at(grant.pid)->tb_decoded(grant, std::move(result));
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}
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}
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/// Called from MAC (Stack thread after, e.g. time alignment expire)
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void dl_harq_entity_nr::reset()
|
||||||
|
{
|
||||||
|
srsran::rwlock_write_guard lock(rwlock);
|
||||||
|
for (const auto& proc : harq_procs) {
|
||||||
|
if (proc != nullptr) {
|
||||||
|
proc->reset();
|
||||||
|
}
|
||||||
|
}
|
||||||
|
bcch_proc.reset();
|
||||||
|
}
|
||||||
|
|
||||||
|
float dl_harq_entity_nr::get_average_retx()
|
||||||
|
{
|
||||||
|
return average_retx;
|
||||||
|
}
|
||||||
|
|
||||||
|
dl_harq_entity_nr::dl_harq_process_nr::dl_harq_process_nr(dl_harq_entity_nr* parent_) :
|
||||||
|
harq_entity(parent_),
|
||||||
|
softbuffer_rx(std::unique_ptr<srsran_softbuffer_rx_t>(new srsran_softbuffer_rx_t())),
|
||||||
|
logger(srslog::fetch_basic_logger("MAC-NR"))
|
||||||
|
{}
|
||||||
|
|
||||||
|
dl_harq_entity_nr::dl_harq_process_nr::~dl_harq_process_nr()
|
||||||
|
{
|
||||||
|
if (softbuffer_rx != nullptr) {
|
||||||
|
srsran_softbuffer_rx_free(softbuffer_rx.get());
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
bool dl_harq_entity_nr::dl_harq_process_nr::init(int pid_)
|
||||||
|
{
|
||||||
|
if (softbuffer_rx == nullptr || srsran_softbuffer_rx_init_guru(softbuffer_rx.get(),
|
||||||
|
SRSRAN_SCH_NR_MAX_NOF_CB_LDPC,
|
||||||
|
SRSRAN_LDPC_MAX_LEN_ENCODED_CB) != SRSRAN_SUCCESS) {
|
||||||
|
logger.error("Couldn't allocate and/or initialize softbuffer");
|
||||||
|
return false;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (pid_ < 0) {
|
||||||
|
is_bcch = true;
|
||||||
|
pid = 0;
|
||||||
|
} else {
|
||||||
|
pid = (uint32_t)pid_;
|
||||||
|
is_bcch = false;
|
||||||
|
}
|
||||||
|
|
||||||
|
return true;
|
||||||
|
}
|
||||||
|
|
||||||
|
void dl_harq_entity_nr::dl_harq_process_nr::reset(void)
|
||||||
|
{
|
||||||
|
current_grant = {};
|
||||||
|
is_first_tb = true;
|
||||||
|
n_retx = 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
uint8_t dl_harq_entity_nr::dl_harq_process_nr::get_ndi()
|
||||||
|
{
|
||||||
|
return current_grant.ndi;
|
||||||
|
}
|
||||||
|
|
||||||
|
void dl_harq_entity_nr::dl_harq_process_nr::new_grant_dl(const mac_nr_grant_dl_t& grant,
|
||||||
|
const bool& ndi_toggled,
|
||||||
|
mac_interface_phy_nr::tb_action_dl_t* action)
|
||||||
|
{
|
||||||
|
// Determine if it's a new transmission 5.3.2.2
|
||||||
|
if (ndi_toggled || // 1st condition (NDI has changed)
|
||||||
|
(is_bcch && grant.rv == 0) || // 2nd condition (Broadcast and 1st transmission)
|
||||||
|
is_first_tb) // 3rd condition (is first tx for this tb)
|
||||||
|
{
|
||||||
|
// New transmission
|
||||||
|
n_retx = 0;
|
||||||
|
srsran_softbuffer_rx_reset_tbs(softbuffer_rx.get(), grant.tbs * 8);
|
||||||
|
|
||||||
|
action->tb.enabled = true;
|
||||||
|
action->tb.softbuffer = softbuffer_rx.get();
|
||||||
|
|
||||||
|
// reset conditions
|
||||||
|
is_first_tb = false;
|
||||||
|
} else {
|
||||||
|
// This is a retransmission
|
||||||
|
if (not acked) {
|
||||||
|
// If data has not yet been successfully decoded, instruct the PHY to combine the received data
|
||||||
|
action->tb.enabled = true;
|
||||||
|
action->tb.softbuffer = softbuffer_rx.get();
|
||||||
|
} else {
|
||||||
|
logger.info("DL %d: Received duplicate. Discarding and retransmitting ACK (n_retx=%d)", pid, n_retx);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
// increment counter and store grant
|
||||||
|
n_retx++;
|
||||||
|
current_grant = grant;
|
||||||
|
}
|
||||||
|
|
||||||
|
void dl_harq_entity_nr::dl_harq_process_nr::tb_decoded(const mac_nr_grant_dl_t& grant,
|
||||||
|
mac_interface_phy_nr::tb_action_dl_result_t result)
|
||||||
|
{
|
||||||
|
acked = result.ack;
|
||||||
|
|
||||||
|
if (acked and result.payload != nullptr) {
|
||||||
|
if (is_bcch) {
|
||||||
|
logger.warning("Delivering PDU=%d bytes to Dissassemble and Demux unit (BCCH) not implemented", grant.tbs);
|
||||||
|
reset();
|
||||||
|
} else {
|
||||||
|
if (grant.rnti == harq_entity->mac->get_temp_crnti()) {
|
||||||
|
logger.debug("Delivering PDU=%d bytes to Dissassemble and Demux unit (Temporal C-RNTI) not implemented",
|
||||||
|
grant.tbs);
|
||||||
|
} else {
|
||||||
|
logger.debug("Delivering PDU=%d bytes to Dissassemble and Demux unit", grant.tbs);
|
||||||
|
harq_entity->demux_unit->push_pdu(std::move(result.payload), grant.tti);
|
||||||
|
|
||||||
|
// Compute average number of retransmissions per packet
|
||||||
|
harq_entity->average_retx = SRSRAN_VEC_CMA((float)n_retx, harq_entity->average_retx, harq_entity->nof_pkts++);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
logger.info("DL %d: %s tbs=%d, rv=%d, ack=%s, ndi=%d",
|
||||||
|
pid,
|
||||||
|
grant.rv == 0 ? "newTX" : "reTX ",
|
||||||
|
grant.tbs,
|
||||||
|
grant.rv,
|
||||||
|
acked ? "OK" : "KO",
|
||||||
|
grant.ndi);
|
||||||
|
}
|
||||||
|
|
||||||
|
} // namespace srsue
|
||||||
Loading…
Reference in New Issue