mirror of https://github.com/PentHertz/srsLTE.git
106 lines
3.1 KiB
C++
106 lines
3.1 KiB
C++
/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2020 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_BAND_HELPER_H
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#define SRSLTE_BAND_HELPER_H
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#include <array>
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#include <stdint.h>
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#include <vector>
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namespace srslte {
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// Helper class to handle frequency bands and ARFCNs
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// For NR: NR-ARFCN and channel raster as per TS 38.104
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class srslte_band_helper
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{
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public:
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srslte_band_helper() = default;
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~srslte_band_helper() = default;
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// Return frequency of given NR-ARFCN in Hz
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double nr_arfcn_to_freq(uint32_t nr_arfcn);
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// Possible values of delta f_raster in Table 5.4.2.3-1 and Table 5.4.2.3-2
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enum delta_f_raster_t {
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DEFAULT = 0, // for bands with 2 possible values for delta_f_raster (e.g. 15 and 30 kHz), the lower is chosen
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KHZ_15,
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KHZ_30,
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KHZ_60,
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KHZ_100,
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KHZ_120
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};
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// Return vector of bands that ARFCN is valid for
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// For bands with 2 possible raster offsets, delta_f_raster needs to be specified
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std::vector<uint32_t> get_bands_nr(uint32_t nr_arfcn, delta_f_raster_t delta_f_raster = DEFAULT);
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private:
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// Table 5.4.2.1-1
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struct nr_raster_params {
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double delta_F_global_kHz;
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double F_REF_Offs_MHz;
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uint32_t N_REF_Offs;
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uint32_t N_REF_min;
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uint32_t N_REF_max;
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};
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// Helper to calculate F_REF according to Table 5.4.2.1-1
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nr_raster_params get_raster_params(uint32_t nr_arfcn);
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static const uint32_t max_nr_arfcn = 3279165;
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static constexpr std::array<nr_raster_params, 3> nr_fr_params = {{
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// clang-format off
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// Frequency range 0 - 3000 MHz
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{5, 0.0, 0, 0, 599999},
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// Frequency range 3000 - 24250 MHz
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{15, 3000.0, 600000, 600000, 2016666},
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// Frequency range 24250 - 100000 MHz
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{60, 24250.08, 2016667, 2016667, max_nr_arfcn}
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// clang-format on
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}};
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// Elements of Table 5.4.2.3-1 in TS 38.104
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struct nr_band {
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uint8_t band;
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delta_f_raster_t delta_f_raster;
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uint32_t ul_nref_first;
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uint32_t ul_nref_step;
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uint32_t ul_nref_last;
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uint32_t dl_nref_first;
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uint32_t dl_nref_step;
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uint32_t dl_nref_last;
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};
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// List of NR bands for FR1 (Table 5.4.2.3-1)
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// bands with more than one raster offset have multiple entries
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// TODO: add remaining bands
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static const uint32_t nof_nr_bands_fr1 = 7;
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static constexpr std::array<nr_band, nof_nr_bands_fr1> nr_band_table_fr1 = {{
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// clang-format off
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{74, KHZ_100, 285400, 20, 294000, 295000, 20, 303600},
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// n75+n76 missing
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{77, KHZ_15, 620000, 1, 680000, 620000, 1, 680000},
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{77, KHZ_30, 620000, 2, 680000, 620000, 2, 680000},
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{78, KHZ_15, 620000, 1, 653333, 620000, 1, 653333},
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{78, KHZ_30, 620000, 2, 653332, 620000, 2, 653332},
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{79, KHZ_15, 693334, 2, 733333, 693334, 2, 733333},
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{79, KHZ_30, 693334, 2, 733332, 693334, 2, 733332}
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// clang-format on
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}};
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};
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} // namespace srslte
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#endif // SRSLTE_BAND_HELPER_H
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