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248 lines
9.7 KiB
C
248 lines
9.7 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: ue_dl.h
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*
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* Description: UE downlink object.
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*
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* This module is a frontend to all the downlink data and control
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* channel processing modules.
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*
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* Reference:
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*****************************************************************************/
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#ifndef SRSLTE_UE_DL_H
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#define SRSLTE_UE_DL_H
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#include <stdbool.h>
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#include "srslte/phy/ch_estimation/chest_dl.h"
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#include "srslte/phy/common/phy_common.h"
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#include "srslte/phy/dft/ofdm.h"
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#include "srslte/phy/phch/dci.h"
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#include "srslte/phy/phch/pcfich.h"
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#include "srslte/phy/phch/pdcch.h"
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#include "srslte/phy/phch/pdsch.h"
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#include "srslte/phy/phch/pdsch_cfg.h"
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#include "srslte/phy/phch/phich.h"
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#include "srslte/phy/phch/pmch.h"
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#include "srslte/phy/phch/ra.h"
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#include "srslte/phy/phch/regs.h"
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#include "srslte/phy/sync/cfo.h"
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#include "srslte/phy/utils/debug.h"
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#include "srslte/phy/utils/vector.h"
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#include "srslte/config.h"
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#define MAX_CANDIDATES_UE 16 // From 36.213 Table 9.1.1-1
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#define MAX_CANDIDATES_COM 6 // From 36.213 Table 9.1.1-1
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#define MAX_CANDIDATES (MAX_CANDIDATES_UE + MAX_CANDIDATES_COM)
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#define MI_NOF_REGS ((q->cell.frame_type == SRSLTE_FDD) ? 1 : 6)
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#define MI_MAX_REGS 6
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#define SRSLTE_MAX_DCI_MSG SRSLTE_MAX_CARRIERS
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typedef struct SRSLTE_API {
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srslte_dci_format_t format;
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srslte_dci_location_t loc[MAX_CANDIDATES];
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uint32_t nof_locations;
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} dci_blind_search_t;
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typedef struct SRSLTE_API {
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// Cell configuration
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srslte_cell_t cell;
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uint32_t nof_rx_antennas;
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uint16_t current_mbsfn_area_id;
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uint16_t pregen_rnti;
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// Objects for all DL Physical Channels
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srslte_pcfich_t pcfich;
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srslte_pdcch_t pdcch;
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srslte_pdsch_t pdsch;
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srslte_pmch_t pmch;
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srslte_phich_t phich;
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// Control region
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srslte_regs_t regs[MI_MAX_REGS];
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uint32_t mi_manual_index;
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bool mi_auto;
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// Channel estimation and OFDM demodulation
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srslte_chest_dl_t chest;
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srslte_chest_dl_res_t chest_res;
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srslte_ofdm_t fft[SRSLTE_MAX_PORTS];
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srslte_ofdm_t fft_mbsfn;
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// Buffers to store channel symbols after demodulation
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cf_t* sf_symbols[SRSLTE_MAX_PORTS];
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// Variables for blind DCI search
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dci_blind_search_t current_ss_ue[MI_MAX_REGS][3][10];
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dci_blind_search_t current_ss_common[MI_MAX_REGS][3];
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srslte_dci_msg_t pending_ul_dci_msg[SRSLTE_MAX_DCI_MSG];
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uint32_t pending_ul_dci_count;
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} srslte_ue_dl_t;
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// Downlink config (includes common and dedicated variables)
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typedef struct SRSLTE_API {
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srslte_cqi_report_cfg_t cqi_report;
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srslte_pdsch_cfg_t pdsch;
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srslte_dci_cfg_t dci;
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srslte_tm_t tm;
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bool dci_common_ss;
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} srslte_dl_cfg_t;
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typedef struct SRSLTE_API {
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srslte_dl_cfg_t cfg;
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srslte_chest_dl_cfg_t chest_cfg;
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uint32_t last_ri;
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float snr_to_cqi_offset;
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} srslte_ue_dl_cfg_t;
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typedef struct {
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uint32_t v_dai_dl;
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uint32_t n_cce;
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uint32_t grant_cc_idx;
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uint32_t tpc_for_pucch;
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} srslte_pdsch_ack_resource_t;
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typedef struct {
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srslte_pdsch_ack_resource_t resource;
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uint32_t k;
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uint8_t value[SRSLTE_MAX_CODEWORDS]; // 0/1 or 2 for DTX
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bool present;
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} srslte_pdsch_ack_m_t;
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typedef struct {
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uint32_t M;
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srslte_pdsch_ack_m_t m[SRSLTE_UCI_MAX_M];
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} srslte_pdsch_ack_cc_t;
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typedef struct {
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srslte_pdsch_ack_cc_t cc[SRSLTE_MAX_CARRIERS];
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uint32_t nof_cc;
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uint32_t V_dai_ul;
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srslte_tm_t transmission_mode;
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srslte_ack_nack_feedback_mode_t ack_nack_feedback_mode;
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bool is_grant_available;
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bool is_pusch_available;
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bool tdd_ack_multiplex;
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bool simul_cqi_ack;
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bool simul_cqi_ack_pucch3;
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} srslte_pdsch_ack_t;
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SRSLTE_API int
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srslte_ue_dl_init(srslte_ue_dl_t* q, cf_t* input[SRSLTE_MAX_PORTS], uint32_t max_prb, uint32_t nof_rx_antennas);
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SRSLTE_API void srslte_ue_dl_free(srslte_ue_dl_t* q);
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SRSLTE_API int srslte_ue_dl_set_cell(srslte_ue_dl_t* q, srslte_cell_t cell);
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SRSLTE_API void srslte_ue_dl_set_rnti(srslte_ue_dl_t* q, uint16_t rnti);
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SRSLTE_API int srslte_ue_dl_set_mbsfn_area_id(srslte_ue_dl_t* q, uint16_t mbsfn_area_id);
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SRSLTE_API void srslte_ue_dl_set_non_mbsfn_region(srslte_ue_dl_t* q, uint8_t non_mbsfn_region_length);
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SRSLTE_API void srslte_ue_dl_set_mi_manual(srslte_ue_dl_t* q, uint32_t mi_idx);
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SRSLTE_API void srslte_ue_dl_set_mi_auto(srslte_ue_dl_t* q);
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/* Perform signal demodulation and channel estimation and store signals in the object */
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SRSLTE_API int srslte_ue_dl_decode_fft_estimate(srslte_ue_dl_t* q, srslte_dl_sf_cfg_t* sf, srslte_ue_dl_cfg_t* cfg);
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SRSLTE_API int srslte_ue_dl_decode_fft_estimate_noguru(srslte_ue_dl_t* q,
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srslte_dl_sf_cfg_t* sf,
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srslte_ue_dl_cfg_t* cfg,
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cf_t* input[SRSLTE_MAX_PORTS]);
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/* Finds UL/DL DCI in the signal processed in a previous call to decode_fft_estimate() */
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SRSLTE_API int srslte_ue_dl_find_ul_dci(srslte_ue_dl_t* q,
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srslte_dl_sf_cfg_t* sf,
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srslte_ue_dl_cfg_t* dl_cfg,
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uint16_t rnti,
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srslte_dci_ul_t dci_msg[SRSLTE_MAX_DCI_MSG]);
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SRSLTE_API int srslte_ue_dl_find_dl_dci(srslte_ue_dl_t* q,
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srslte_dl_sf_cfg_t* sf,
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srslte_ue_dl_cfg_t* dl_cfg,
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uint16_t rnti,
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srslte_dci_dl_t dci_msg[SRSLTE_MAX_DCI_MSG]);
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SRSLTE_API int srslte_ue_dl_dci_to_pdsch_grant(srslte_ue_dl_t* q,
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srslte_dl_sf_cfg_t* sf,
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srslte_ue_dl_cfg_t* cfg,
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srslte_dci_dl_t* dci,
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srslte_pdsch_grant_t* grant);
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/* Decodes PDSCH and PHICH in the signal processed in a previous call to decode_fft_estimate() */
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SRSLTE_API int srslte_ue_dl_decode_pdsch(srslte_ue_dl_t* q,
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srslte_dl_sf_cfg_t* sf,
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srslte_pdsch_cfg_t* pdsch_cfg,
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srslte_pdsch_res_t data[SRSLTE_MAX_CODEWORDS]);
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SRSLTE_API int srslte_ue_dl_decode_pmch(srslte_ue_dl_t* q,
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srslte_dl_sf_cfg_t* sf,
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srslte_pmch_cfg_t* pmch_cfg,
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srslte_pdsch_res_t* data);
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SRSLTE_API int srslte_ue_dl_decode_phich(srslte_ue_dl_t* q,
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srslte_dl_sf_cfg_t* sf,
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srslte_ue_dl_cfg_t* cfg,
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srslte_phich_grant_t* grant,
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srslte_phich_res_t* result);
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SRSLTE_API int srslte_ue_dl_select_ri(srslte_ue_dl_t* q, uint32_t* ri, float* cn);
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SRSLTE_API void srslte_ue_dl_gen_cqi_periodic(srslte_ue_dl_t* q,
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srslte_ue_dl_cfg_t* cfg,
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uint32_t wideband_value,
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uint32_t tti,
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srslte_uci_data_t* uci_data);
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SRSLTE_API void srslte_ue_dl_gen_cqi_aperiodic(srslte_ue_dl_t* q,
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srslte_ue_dl_cfg_t* cfg,
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uint32_t wideband_value,
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srslte_uci_data_t* uci_data);
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SRSLTE_API void srslte_ue_dl_gen_ack(const srslte_cell_t* cell,
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const srslte_dl_sf_cfg_t* sf,
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const srslte_pdsch_ack_t* ack_info,
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srslte_uci_data_t* uci_data);
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/* Functions used for testing purposes */
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SRSLTE_API int srslte_ue_dl_find_and_decode(srslte_ue_dl_t* q,
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srslte_dl_sf_cfg_t* sf,
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srslte_ue_dl_cfg_t* cfg,
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srslte_pdsch_cfg_t* pdsch_cfg,
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uint8_t* data[SRSLTE_MAX_CODEWORDS],
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bool acks[SRSLTE_MAX_CODEWORDS]);
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SRSLTE_API void srslte_ue_dl_save_signal(srslte_ue_dl_t* q, srslte_dl_sf_cfg_t* sf, srslte_pdsch_cfg_t* pdsch_cfg);
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#endif // SRSLTE_UE_DL_H
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