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245 lines
8.8 KiB
C
245 lines
8.8 KiB
C
/**
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* Copyright 2013-2021 Software Radio Systems Limited
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*
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* This file is part of srsRAN.
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*
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* srsRAN 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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* srsRAN 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: prach.h
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*
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* Description: Physical random access channel.
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*
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* Reference: 3GPP TS 36.211 version 10.0.0 Release 10 Sec. 5.7
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*****************************************************************************/
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#ifndef SRSRAN_PRACH_H
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#define SRSRAN_PRACH_H
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#include "srsran/config.h"
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#include "srsran/phy/common/phy_common.h"
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#include "srsran/phy/dft/dft.h"
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#include <complex.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdlib.h>
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#define SRSRAN_PRACH_MAX_LEN (2 * 24576 + 21024) // Maximum Tcp + Tseq
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// Long PRACH ZC sequence sequence length
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#define SRSRAN_PRACH_N_ZC_LONG 839
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// Short PRACH ZC sequence sequence length
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#define SRSRAN_PRACH_N_ZC_SHORT 139
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/** Generation and detection of RACH signals for uplink.
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* Currently only supports preamble formats 0-3.
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* Does not currently support high speed flag.
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* Based on 3GPP TS 36.211 version 10.7.0 Release 10.
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*/
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typedef struct {
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int idx;
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float factor;
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cf_t phase_array[2 * SRSRAN_PRACH_N_ZC_LONG];
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} srsran_prach_cancellation_t;
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typedef struct SRSRAN_API {
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// Parameters from higher layers (extracted from SIB2)
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bool is_nr;
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uint32_t config_idx;
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uint32_t f; // preamble format
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uint32_t rsi; // rootSequenceIndex
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bool hs; // highSpeedFlag
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uint32_t zczc; // zeroCorrelationZoneConfig
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uint32_t N_ifft_ul; // IFFT size for uplink
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uint32_t N_ifft_prach; // IFFT size for PRACH generation
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uint32_t max_N_ifft_ul;
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// Working parameters
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uint32_t N_zc; // PRACH sequence length
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uint32_t N_cs; // Cyclic shift size
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uint32_t N_seq; // Preamble length
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float T_seq; // Preamble length in seconds
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float T_tot; // Total sequence length in seconds
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uint32_t N_cp; // Cyclic prefix length
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// Generated tables
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cf_t seqs[64][SRSRAN_PRACH_N_ZC_LONG]; // Our set of 64 preamble sequences
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cf_t dft_seqs[64][SRSRAN_PRACH_N_ZC_LONG]; // DFT-precoded seqs
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uint64_t dft_gen_bitmap; // Bitmap where each bit Indicates if the dft has been generated for sequence i.
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uint32_t root_seqs_idx[64]; // Indices of root seqs in seqs table
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uint32_t N_roots; // Number of root sequences used in this configuration
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cf_t* td_signals[64];
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// Containers
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cf_t* ifft_in;
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cf_t* ifft_out;
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cf_t* prach_bins;
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cf_t* corr_spec;
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float* corr;
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// PRACH IFFT
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srsran_dft_plan_t fft;
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srsran_dft_plan_t ifft;
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// ZC-sequence FFT and IFFT
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srsran_dft_plan_t zc_fft;
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srsran_dft_plan_t zc_ifft;
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cf_t* signal_fft;
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float detect_factor;
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uint32_t deadzone;
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float peak_values[65];
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uint32_t peak_offsets[65];
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uint32_t num_ra_preambles;
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bool successive_cancellation;
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bool freq_domain_offset_calc;
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srsran_tdd_config_t tdd_config;
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uint32_t current_prach_idx;
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cf_t* cross;
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cf_t* corr_freq;
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srsran_prach_cancellation_t prach_cancel;
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cf_t sub[839 * 2];
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float phase[839];
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} srsran_prach_t;
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typedef struct SRSRAN_API {
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int nof_sf;
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uint32_t sf[5];
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} srsran_prach_sf_config_t;
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///@brief Maximum number of subframe number candidates for PRACH NR configuration
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#define PRACH_NR_CFG_MAX_NOF_SF 5
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/**
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* @brief PRACH configuration for NR as described in TS 38.211 Tables 6.3.3.2-2, 6.3.3.2-3 and 6.3.3.2-4
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*/
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typedef struct {
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uint32_t preamble_format;
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uint32_t x;
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uint32_t y;
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uint32_t subframe_number[PRACH_NR_CFG_MAX_NOF_SF];
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uint32_t nof_subframe_number;
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uint32_t starting_symbol; // subframe number
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} prach_nr_config_t;
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typedef enum SRSRAN_API {
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SRSRAN_PRACH_SFN_EVEN = 0,
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SRSRAN_PRACH_SFN_ANY,
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} srsran_prach_sfn_t;
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typedef struct {
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bool is_nr; // Set to true if NR
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uint32_t config_idx;
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uint32_t root_seq_idx;
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uint32_t zero_corr_zone;
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uint32_t freq_offset;
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uint32_t num_ra_preambles;
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bool hs_flag;
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srsran_tdd_config_t tdd_config;
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bool enable_successive_cancellation;
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bool enable_freq_domain_offset_calc;
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} srsran_prach_cfg_t;
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typedef struct SRSRAN_API {
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uint32_t f;
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uint32_t t0;
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uint32_t t1;
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uint32_t t2;
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} srsran_prach_tdd_loc_t;
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typedef struct SRSRAN_API {
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uint32_t nof_elems;
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srsran_prach_tdd_loc_t elems[6];
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} srsran_prach_tdd_loc_table_t;
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SRSRAN_API uint32_t srsran_prach_get_preamble_format(uint32_t config_idx);
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SRSRAN_API srsran_prach_sfn_t srsran_prach_get_sfn(uint32_t config_idx);
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SRSRAN_API bool srsran_prach_tti_opportunity(srsran_prach_t* p, uint32_t current_tti, int allowed_subframe);
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SRSRAN_API bool
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srsran_prach_tti_opportunity_config_fdd(uint32_t config_idx, uint32_t current_tti, int allowed_subframe);
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SRSRAN_API bool srsran_prach_tti_opportunity_config_tdd(uint32_t config_idx,
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uint32_t tdd_ul_dl_config,
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uint32_t current_tti,
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uint32_t* prach_idx);
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SRSRAN_API const prach_nr_config_t* srsran_prach_nr_get_cfg_fr1_unpaired(uint32_t config_idx);
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SRSRAN_API bool srsran_prach_nr_tti_opportunity_fr1_unpaired(uint32_t config_idx, uint32_t current_tti);
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SRSRAN_API uint32_t srsran_prach_nr_start_symbol_fr1_unpaired(uint32_t config_idx);
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SRSRAN_API uint32_t srsran_prach_f_ra_tdd(uint32_t config_idx,
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uint32_t tdd_ul_dl_config,
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uint32_t current_tti,
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uint32_t prach_idx,
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uint32_t prach_offset,
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uint32_t n_rb_ul);
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SRSRAN_API uint32_t srsran_prach_f_id_tdd(uint32_t config_idx, uint32_t tdd_ul_dl_config, uint32_t prach_idx);
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SRSRAN_API uint32_t srsran_prach_nof_f_idx_tdd(uint32_t config_idx, uint32_t tdd_ul_dl_config);
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SRSRAN_API void srsran_prach_sf_config(uint32_t config_idx, srsran_prach_sf_config_t* sf_config);
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SRSRAN_API int srsran_prach_init(srsran_prach_t* p, uint32_t max_N_ifft_ul);
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SRSRAN_API int srsran_prach_set_cfg(srsran_prach_t* p, srsran_prach_cfg_t* cfg, uint32_t nof_prb);
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SRSRAN_API int srsran_prach_gen(srsran_prach_t* p, uint32_t seq_index, uint32_t freq_offset, cf_t* signal);
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SRSRAN_API int srsran_prach_detect(srsran_prach_t* p,
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uint32_t freq_offset,
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cf_t* signal,
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uint32_t sig_len,
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uint32_t* indices,
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uint32_t* ind_len);
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SRSRAN_API int srsran_prach_detect_offset(srsran_prach_t* p,
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uint32_t freq_offset,
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cf_t* signal,
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uint32_t sig_len,
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uint32_t* indices,
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float* t_offsets,
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float* peak_to_avg,
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uint32_t* ind_len);
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SRSRAN_API void srsran_prach_set_detect_factor(srsran_prach_t* p, float factor);
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SRSRAN_API int srsran_prach_free(srsran_prach_t* p);
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SRSRAN_API int srsran_prach_print_seqs(srsran_prach_t* p);
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SRSRAN_API int srsran_prach_process(srsran_prach_t* p,
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cf_t* signal,
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uint32_t* indices,
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float* t_offsets,
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float* peak_to_avg,
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uint32_t* n_indices,
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int cancellation_idx,
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uint32_t begin,
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uint32_t sig_len);
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#endif // SRSRAN_PRACH_H
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