/** * Copyright 2013-2021 Software Radio Systems Limited * * This file is part of srsRAN. * * srsRAN is free software: you can redistribute it and/or modify * it under the terms of the GNU Affero General Public License as * published by the Free Software Foundation, either version 3 of * the License, or (at your option) any later version. * * srsRAN is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Affero General Public License for more details. * * A copy of the GNU Affero General Public License can be found in * the LICENSE file in the top-level directory of this distribution * and at http://www.gnu.org/licenses/. * */ #ifndef SRSRAN_UE_MIB_NBIOT_H #define SRSRAN_UE_MIB_NBIOT_H #include "srsran/config.h" #include "srsran/phy/ch_estimation/chest_dl_nbiot.h" #include "srsran/phy/dft/ofdm.h" #include "srsran/phy/phch/npbch.h" #include "srsran/phy/sync/cfo.h" #include "srsran/phy/ue/ue_sync_nbiot.h" #define SRSRAN_UE_MIB_NBIOT_NOF_PRB 6 #define SRSRAN_UE_MIB_NBIOT_FOUND 1 #define SRSRAN_UE_MIB_NBIOT_NOTFOUND 0 /** * \brief This object decodes the MIB-NB from the NPBCH of an NB-IoT LTE signal. * * The function srsran_ue_mib_nbiot_decode() shall be called multiple * times, each passing a number of samples multiple of 19200, * sampled at 1.92 MHz (that is, 10 ms of samples). * * The function uses the sync_t object to find the NPSS sequence and * decode the NPBCH to obtain the MIB. * * The function returns 0 until the MIB is decoded. */ typedef struct SRSRAN_API { srsran_sync_nbiot_t sfind; cf_t* sf_symbols; cf_t* ce[SRSRAN_MAX_PORTS]; srsran_ofdm_t fft; srsran_chest_dl_nbiot_t chest; srsran_npbch_t npbch; uint8_t last_bch_payload[SRSRAN_MIB_NB_LEN]; uint32_t nof_tx_ports; uint32_t nof_rx_antennas; uint32_t sfn_offset; uint32_t frame_cnt; } srsran_ue_mib_nbiot_t; SRSRAN_API int srsran_ue_mib_nbiot_init(srsran_ue_mib_nbiot_t* q, cf_t** in_buffer, uint32_t max_prb); SRSRAN_API int srsran_ue_mib_nbiot_set_cell(srsran_ue_mib_nbiot_t* q, srsran_nbiot_cell_t cell); SRSRAN_API void srsran_ue_mib_nbiot_free(srsran_ue_mib_nbiot_t* q); SRSRAN_API void srsran_ue_mib_nbiot_reset(srsran_ue_mib_nbiot_t* q); SRSRAN_API int srsran_ue_mib_nbiot_decode(srsran_ue_mib_nbiot_t* q, cf_t* input, uint8_t* bch_payload, uint32_t* nof_tx_ports, int* sfn_offset); /* This interface uses ue_mib and ue_sync to first get synchronized subframes * and then decode MIB * * This object calls the pbch object with nof_ports=0 for blind nof_ports determination */ typedef struct { srsran_ue_mib_nbiot_t ue_mib; srsran_nbiot_ue_sync_t ue_sync; cf_t* sf_buffer[SRSRAN_MAX_PORTS]; uint32_t nof_rx_antennas; } srsran_ue_mib_sync_nbiot_t; SRSRAN_API int srsran_ue_mib_sync_nbiot_init_multi(srsran_ue_mib_sync_nbiot_t* q, int(recv_callback)(void*, cf_t* [SRSRAN_MAX_PORTS], uint32_t, srsran_timestamp_t*), uint32_t nof_rx_antennas, void* stream_handler); SRSRAN_API void srsran_ue_mib_sync_nbiot_free(srsran_ue_mib_sync_nbiot_t* q); SRSRAN_API int srsran_ue_mib_sync_nbiot_set_cell(srsran_ue_mib_sync_nbiot_t* q, srsran_nbiot_cell_t cell); SRSRAN_API void srsran_ue_mib_sync_nbiot_reset(srsran_ue_mib_sync_nbiot_t* q); SRSRAN_API int srsran_ue_mib_sync_nbiot_decode(srsran_ue_mib_sync_nbiot_t* q, uint32_t max_frames_timeout, uint8_t* bch_payload, uint32_t* nof_tx_ports, int* sfn_offset); #endif // SRSRAN_UE_MIB_NBIOT_H