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149 lines
6.6 KiB
C
149 lines
6.6 KiB
C
/*
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* Copyright 2013-2020 Software Radio Systems Limited
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*
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* This file is part of srsLTE.
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*
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* srsLTE is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of
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* the License, or (at your option) any later version.
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*
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* srsLTE is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* A copy of the GNU Affero General Public License can be found in
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* the LICENSE file in the top-level directory of this distribution
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* and at http://www.gnu.org/licenses/.
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*
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*/
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/******************************************************************************
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* File: sch_nr.h
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*
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* Description: Common UL and DL shared channel encode/decode functions for NR.
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*
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* Reference: 3GPP TS 38.212 V15.9.0
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*****************************************************************************/
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#ifndef SRSLTE_SCH_NR_H
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#define SRSLTE_SCH_NR_H
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#include "srslte/config.h"
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#include "srslte/phy/common/phy_common_nr.h"
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#include "srslte/phy/fec/crc.h"
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#include "srslte/phy/fec/ldpc/ldpc_decoder.h"
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#include "srslte/phy/fec/ldpc/ldpc_encoder.h"
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#include "srslte/phy/fec/ldpc/ldpc_rm.h"
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#include "srslte/phy/phch/pdsch_cfg_nr.h"
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#include "srslte/phy/phch/ra_nr.h"
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#define SRSLTE_SCH_NR_MAX_NOF_CB_LDPC \
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((SRSLTE_MAX_PRB_NR * SRSLTE_NRE * 8 * SRSLTE_NSYMB_PER_SLOT_NR + (SRSLTE_LDPC_BG2_MAX_LEN_CB - 1)) / \
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SRSLTE_LDPC_BG2_MAX_LEN_CB)
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typedef struct SRSLTE_API {
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srslte_carrier_nr_t carrier;
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/// Temporal data buffers
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uint8_t* temp_cb;
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/// CRC generators
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srslte_crc_t crc_tb_24;
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srslte_crc_t crc_tb_16;
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srslte_crc_t crc_cb;
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/// LDPC encoders
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srslte_ldpc_encoder_t* encoder_bg1[MAX_LIFTSIZE + 1];
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srslte_ldpc_encoder_t* encoder_bg2[MAX_LIFTSIZE + 1];
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/// LDPC decoders
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srslte_ldpc_decoder_t* decoder_bg1[MAX_LIFTSIZE + 1];
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srslte_ldpc_decoder_t* decoder_bg2[MAX_LIFTSIZE + 1];
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/// LDPC Rate matcher
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srslte_ldpc_rm_t tx_rm;
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srslte_ldpc_rm_t rx_rm;
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} srslte_sch_nr_t;
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typedef struct SRSLTE_API {
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bool disable_simd;
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bool use_flooded;
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float scaling_factor;
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} srslte_sch_nr_decoder_cfg_t;
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/**
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* @brief Common SCH configuration
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*/
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typedef struct {
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srslte_basegraph_t bg; ///< @brief Base graph
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uint32_t Qm; ///< @brief Modulation order
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uint32_t G; ///< Number of available bits
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uint32_t A; ///< @brief Payload size, TBS
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uint32_t L_tb; ///< @brief the number of the transport block parity bits (16 or 24 bits)
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uint32_t L_cb; ///< @brief the number of the code block parity bits (0 or 24 bits)
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uint32_t B; ///< @brief the number of bits in the transport block including TB CRC
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uint32_t Bp; ///< @brief the number of bits in the transport block including CB and TB CRCs
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uint32_t Kp; ///< @brief Number of payload bits of the code block including CB CRC
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uint32_t Kr; ///< @brief Number of payload bits of the code block including CB CRC and filler bits
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uint32_t F; ///< @brief Number of filler bits
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uint32_t Nref; ///< @brief N_ref parameter described in TS 38.212 V15.9.0 5.4.2.1
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uint32_t Z; ///< @brief LDPC lifting size
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uint32_t Nl; ///< @brief Number of transmission layers that the transport block is mapped onto
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bool mask[SRSLTE_SCH_NR_MAX_NOF_CB_LDPC]; ///< Indicates what codeblocks shall be encoded/decoded
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uint32_t C; ///< Number of codeblocks
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uint32_t Cp; ///< Number of codeblocks that are actually transmitted
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srslte_crc_t* crc_tb; ///< Selected CRC for transport block
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srslte_ldpc_encoder_t* encoder; ///< @brief Points to the selected encoder (if valid)
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srslte_ldpc_decoder_t* decoder; ///< @brief Points to the selected decoder (if valid)
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} srslte_sch_nr_common_cfg_t;
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/**
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* @brief Base graph selection from a provided transport block size and target rate
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*
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* @remark Defined for DL-SCH in TS 38.212 V15.9.0 section 7.2.2 LDPC base graph selection
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* @remark Defined for UL-SCH in TS 38.212 V15.9.0 section 6.2.2 LDPC base graph selection
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*
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* @param tbs the payload size as described in Clause 7.2.1 for DL-SCH and 6.2.1 for UL-SCH.
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* @param R Target rate
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* @return it returns the selected base graph
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*/
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SRSLTE_API srslte_basegraph_t srslte_sch_nr_select_basegraph(uint32_t tbs, double R);
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/**
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* @brief Calculates all the parameters required for performing TS 38.212 V15.9.0 5.4 General procedures for LDPC
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* @param pdsch_cfg Provides higher layers configuration
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* @param tb Provides transport block configuration
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* @param cfg SCH object
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* @return
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*/
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SRSLTE_API int srslte_dlsch_nr_fill_cfg(srslte_sch_nr_t* q,
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const srslte_pdsch_cfg_nr_t* pdsch_cfg,
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const srslte_ra_tb_nr_t* tb,
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srslte_sch_nr_common_cfg_t* cfg);
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SRSLTE_API int srslte_sch_nr_init_tx(srslte_sch_nr_t* q);
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SRSLTE_API int srslte_sch_nr_init_rx(srslte_sch_nr_t* q, const srslte_sch_nr_decoder_cfg_t* cfg);
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SRSLTE_API int srslte_sch_nr_set_carrier(srslte_sch_nr_t* q, const srslte_carrier_nr_t* carrier);
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SRSLTE_API void srslte_sch_nr_free(srslte_sch_nr_t* q);
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SRSLTE_API int srslte_dlsch_nr_encode(srslte_sch_nr_t* q,
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const srslte_pdsch_cfg_nr_t* cfg,
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const srslte_ra_tb_nr_t* tb,
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const uint8_t* data,
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uint8_t* e_bits);
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SRSLTE_API int srslte_sch_nr_decoder_set_carrier(srslte_sch_nr_t* q, const srslte_carrier_nr_t* carrier);
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SRSLTE_API int srslte_dlsch_nr_decode(srslte_sch_nr_t* q,
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const srslte_pdsch_cfg_nr_t* cfg,
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const srslte_ra_tb_nr_t* tb,
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int8_t* e_bits,
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uint8_t* data,
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bool* crc_ok);
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#endif // SRSLTE_SCH_NR_H
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